Julmarichardia magdae, Moralés-Núñez & Heard, 2021

Moralés-Núñez, Andres G. & Heard, Richard W., 2021, Julmarichardiidae, a new apseudoidean family (Crustacea: Tanaidacea: Apseudomorpha) with the description of a new species of Julmarichardia Guţu 1995 from the Northwest Australian Shelf, Zootaxa 5081 (1), pp. 77-115 : 82-102

publication ID

https://doi.org/10.11646/zootaxa.5081.1.3

publication LSID

lsid:zoobank.org:pub:2A63D6CB-4838-45F1-8B2B-60A2F56216D3

DOI

https://doi.org/10.5281/zenodo.5770539

persistent identifier

https://treatment.plazi.org/id/5F1B8791-FF8D-FF88-C1D1-5D01FECCF85E

treatment provided by

Plazi

scientific name

Julmarichardia magdae
status

sp. nov.

Julmarichardia magdae sp. nov.

( Figs 3–19 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 View FIGURE 9 View FIGURE 10 View FIGURE 11 View FIGURE 12 View FIGURE 13 View FIGURE 14 View FIGURE 15 View FIGURE 16 View FIGURE 17 View FIGURE 18 View FIGURE 19 ; 20G, M, O View FIGURE 20 )

Material examined. Type material. Holotype — non-ovigerous ♀ (with oostegites), TBL 3.4 mm, ( AM P.52337), Station (Stn) 01-B9-S, (19°28’00’’S; - 118°55’.00’’E), depth 38 m, Coll: FRV “ Soela ”, CSIRO 12-Feb-1983.

Paratypes — one ♂ (damaged), ( AM P.52191), Stn 02-B12-S, (19°03’30’’S; 119°03’06’’E), depth 82 m, Coll +: FRV “ Soela ”, CSIRO 28-Apr-1983 GoogleMaps . — one SA, one non-ovigerous ♀ (with oostegites), and one ♂, ( AM P.52203), Stn 04-B13-S, (19°48’48’’S; 117°52’12’’E), depth 52 m, Coll : FRV “ Soela ”, CSIRO 02-Sep-1983 GoogleMaps . — two nonovigerous ♀♀ (with oostegites), three ovigerous ♀♀, one ♂ (damaged), and two undetermined, ( AM P.52327), Stn 04-B16-S, (20°01’12’’S; 116°57’36’’E), depth 52 m, Coll : FRV “ Soela ”, CSIRO 04-Sep-1983 GoogleMaps . —one nonovigerous ♀, one ovigerous ♀, and one ♂ ( TBL 3.3 mm, 3.3 mm, and 2.5 mm, respectively; USNM 1659739 View Materials ); one non-ovigerous ♀, one ovigerous ♀, and one ♂ ( TBL 3.1 mm, 3.4 mm, and 2.4 mm, respectively; GCRL 06610 View Materials ); eight non-ovigerous ♀, ten ♂♂, and 15 undetermined ( AM P.105698), same collection data as holotype. — two non-ovigerous ♀♀ (with oostegites) and one ♂, ( AM P.52343), Stn 02-B6-S, (19°04’18’’S; 118°47’48’’E), depth 83 m, Coll : FRV “ Soela ”, CSIRO 27-Apr-1983 GoogleMaps . — eleven non-ovigerous ♀♀ (with oostegites), two ovigerous ♀♀, 13 ♂♂, and 15 undetermined, same collection data as holotype. — three non-ovigerous ♀♀ (with oostegites), four ovigerous ♀♀, and five ♂♂ (one chelipeds missing) ( AM P.52367), Stn 01-B8-S, (19°29’0’’S; 118°53’30’’E), depth 40 m, Coll : FRV “ Soela ”, CSIRO 12-Feb-1983 GoogleMaps . — three SA, 20 non-ovigerous ♀♀ (with oostegites), five ovigerous ♀♀ (one damaged), and 14 ♂♂, ( AM P.52391), Stn 05-B2-S, (19°56’42’’S; 117°53’48’’E), depth 41 m, Coll : FRV “ Soela ”, CSIRO 26-Oct-1983 GoogleMaps . — one ♂, ( AM P.105699), Stn 01-B4-S, (19°05’18’’S; 118°54’00’’E), depth 82 m, Coll : FRV “ Soela ”, CSIRO 15-Feb-1983 GoogleMaps . — one SA, 14 non-ovigerous ♀♀ (with oostegites), six ovigerous ♀♀, two ♀♀ with remnants of marsupium, ten ♂♂, ( AM P.105700), Stn 05-B6-S, (19°04’05’’S; 118°47’47’’E), depth 82 m, Coll : FRV “ Soela ”, CSIRO 30-Oct-1983 GoogleMaps .. — three SA, 17 non-ovigerous ♀♀ (with oostegites), two ovigerous ♀♀ (one damaged), and 13 ♂♂, ( AM P52391 View Materials ), Stn 05-B2-S, (19°56’42’’S; - 117°53’48’’E), depth 41 m, Coll : FRV “ Soela ”, CSIRO 26-Oct-1983 GoogleMaps . — one SA, three non-ovigerous ♀♀ (with oostegites), one ♂ ( TBL 2.5 mm, very good condition), and one undetermined (broken), ( AM P.105704), Stn 01-B10-S, (19°05’12’’S; - 118°57’36’’E), depth 82 m, Coll : FRV “ Soela ”, CSIRO 14-Feb-1983 GoogleMaps . — one non-ovigerous ♀ (with oostegites) and one ovigerous ♀ (damaged), ( AM P.56735), Stn 05-D4-S, (19°29’36’’S; 118°52’12’’E), depth 38 m, Coll : FRV “ Soela ”, CSIRO 25-Oct-1983 GoogleMaps . — three SA, four non-ovigerous ♀♀ (with oostegites), three ovigerous ♀♀, and three ♂♂, ( AM P.56739), Stn S 05-B1-5, (19°59’00’’S; 117°51’06’’E), depth 41 m, Coll : FRV “ Soela ”, CSIRO 26-Oct-1983 GoogleMaps . — five ovigerous ♀♀, seven ♂♂, and 13 undetermined (one broken and 12 (partially dried out)), ( AM P.56753), Stn 05- D1-S, (19°29’54’’S; 118°52’00’’E), depth 37 m, Coll : FRV “ Soela ”, CSIRO 24-Oct-1983 GoogleMaps .

Diagnosis. Female. Antennule with outer flagellum of eight or fewer articles. Rostrum with rounded tip, with ~22 or more small, blunt marginal denticles of varying sizes, lacking plumose setae. Left mandible lacinia mobilis with six denticles ( Table 2 View TABLE 2 ).

Male. Cheliped propodus with five bipinnate spiniform setae on mid-medial margin near articulation of dactylus. Rostrum with rounded tip subacute. Pereonites 4– 5 with hyposphenia. Hyposphenia present on all pleonites.

Etymology. The species is named in honor of Magdalena Błażewicz in recognition of her significant contributions to the taxonomy and systematics of the order Tanaidacea .

Type locality. Northwest shelf (19°28’00’’S; 118°55’.00’’E) of Australia .

Distribution. Known only from the type locality at depths ranging from 37 to 83 m.

Description. Based on non-ovigerous ♀ (with oostegites). Body ( Fig. 3A View FIGURE 3 ). Dorso-ventrally flattened, TBL 2.9 mm, about 4.2 times width.

Cephalothorax ( Fig. 3A View FIGURE 3 ). About ~25% of TBL, as long as wide, shorter than combined lengths of pereonites 1–3; rostrum well-developed, spatulate, deflected anteroventrally, margins and tip armed with small denticles and lacking setulate setae; eye-lobes well-defined, pointed, with visual elements present. Carapace with two rows of small spines at base of rostrum, with small denticles at bases of antennule ( Fig. 3A–B View FIGURE 3 ), with six pairs of setulate setae of unequal lengths along mid-dorsal margin, with one plumose seta on the mid-lateral margin.

Pereon ( Fig. 3A View FIGURE 3 ).About ~55% of TBL, all pereonites wider than long, each with antero-posterior lateral margins having very small denticles; pereonite-1 widest; pereonite-4 longest; pereonite-6 shortest; pereonites 1–6 each with one to three setulate setae on proximal and distal margins; pereonites 1–5 with two small, setulate or simple setae mid-dorsally.

Pleon ( Fig. 3A, C View FIGURE 3 ). About ~15% of TBL, combined lengths of pleonites 1–5 longer than pereonites 5–6; all pleonites sub-equal, wider than long, bearing pleopods; each pleonite with anterior-dorsal margin having a row of very small denticles (visible in lateral view, not illustrated); each pleonite with lateral margins armed with denticulate triangulate-like lateral process bearing several plumose setae at or near apex; each pleonite with plumose seta on lateral margins; pleonites 1–4 with four (two proximal and two distal) small simple setae on mid-dorsal margin; pleonite-5 with two plumose setae on disto mid-dorsal margin.

Pleotelson ( Figs 3A, C–E View FIGURE 3 , 16A–C View FIGURE 16 ). About ~5% of TBL, longer than pereonite-6 ( Fig. 3A View FIGURE 3 ), weakly pointed at apex ( Figs 3A View FIGURE 3 , 16A View FIGURE 16 ), anterior dorsal margin with row of five small simple setae, with two rows each of one plumose and three simple setae mid-dorsally on posterior margin, with small, dorsal, sub-distal simple seta adjacent to each uropodal insertion site ( Fig. 3A View FIGURE 3 ); antero-lateral margin with narrow apophysis bearing single plumose seta distally, and small postero-lateral apophysis bearing two plumose setae ( Fig. 3C View FIGURE 3 ); mucus packets adjacent to antero-lateral apophysis and mid margin ( Fig. 16A–C View FIGURE 16 ), mucus packets occurring below ventral margin ( Fig. 16B–C View FIGURE 16 ), with two simple setae on mid posterior margin ( Fig. 3D View FIGURE 3 ), with two sub-distal small simple setae close to the insertion with uropod at each site ( Fig. 3D View FIGURE 3 ).

Antennule ( Figs 4A View FIGURE 4 , 14A View FIGURE 14 ). Peduncle with four articles. Article-1 about 5.1 times longer than wide, with mucus packets in article-1 ( Fig. 14A View FIGURE 14 ); inner margin with ~nine translucent acute or subacute apophyses of varying lengths, with six plumose setae; distal medial margin with two plumose setae; outer margin with acute short mid-marginal translucent apophyses and long distal translucent sub-acute apophyses, having proximal clusters of two and three PSS, two PSS, and long simple seta sub-distally. Article-2 about 1.9 times longer than wide; inner margin with subproximal simple seta and sub-distal plumose seta; distal media margin with two (one long) simple setae and two PSS; outer distal margin with cluster of three PSS. Article-3 about 2.4 times longer than wide; inner distal margin with two PSS and long simple seta; outer distal margin with long simple seta. Article-4 (common) shorter than broad; medial distal margin with row of five PSS. Outer flagellum having eight articles/pseudo-articles, each with simple seta on inner distal margin and 1–2 simple setae on outer distal margin. Articles 3, 5, 7 and 8 with aesthetascs. Inner flagellum with five articles/pseudo-articles. Article-1 small, asetose. Article-2 with three distal simple setae. Article-3 asetose. Article-4 with simple distal seta. Article-5 with two distal simple setae.

Antenna ( Figs 4B–C View FIGURE 4 , 14B View FIGURE 14 ). With eleven articles, distinctly shorter than antennule, with mucus packets in article- 2 ( Fig. 14B View FIGURE 14 ). Article-1 with prominent spatulate process on inner margin, with distal denticles. Article-2 about 4.3 times longer than wide; inner dorsal margin with ~14 translucent acute or subacute apophyses of varying lengths and three plumose setae ( Fig. 4B View FIGURE 4 ); inner ventral margin with proximal rounded process (beneath the spatulate process of article-1) bearing three plumose setae ( Fig. 4C View FIGURE 4 ), with ~ten translucent acute or subacute apophyses of varying lengths, and three plumose setae ( Fig. 4B View FIGURE 4 ); outer dorsal margin with sub-proximal and distal simple seta; squama present, longer than article-3, with four distal simple setae of varying lengths. Article-3 wider than long, inner distal margin with long simple seta. Article-4 about 2.2 times longer than wide; medial distal margin with PPS. Article-5 about 4.5 times longer than wide, longer than article 3–4 combined; inner margin with two long simple setae and PSS; medial distal and sub-distal margins with three PSS. Article-6 short, asetose. Article-7 about 2.6 times longer than wide; each inner and outer margin with two distal simple setae. Article-8 about 3.9 times longer than wide; inner distal margin with simple seta; medial distal margin with simple seta; outer distal margin with two simple setae. Article-9 same length than article-8; inner distal margin with simple seta; medial distal margin with simple seta; outer distal margin with simple seta and PSS. Article-10 about 2.7 times longer than wide; inner distal margin with simple seta. Article-11 about 3.0 times longer than wide, with one sub-distal and five distal setae of varying lengths.

Clypeolabral complex ( Fig. 5A View FIGURE 5 ). Clypeus simple, hood-shaped. Labrum ( Fig. 5A View FIGURE 5 ). Subdivided in two parts by labral suture bearing fine setae, posterior ½ bilobed with inner margins of lobes fringed with fine setae.

Mouthparts: Mandibles ( Fig. 5B–I View FIGURE 5 ). Left mandible, incisor with four denticles ( Fig. 5B View FIGURE 5 ), lacinia mobilis broad with six denticles, proximal-most denticle minute ( Fig. 5C View FIGURE 5 ); setiferous lobe with four forked, distally expanded spatulate setae ( Fig. 5B View FIGURE 5 ). Right mandible, incisor with four denticles ( Fig. 5D–E View FIGURE 5 ), lacinia mobilis well-developed, distally expanded, bifurcate ( Fig. 5D–F View FIGURE 5 ), setiferous lobe with five forked, distally expanded spatulate setae ( Fig. 5D View FIGURE 5 ). Molar process of left and right mandible similar, with grinding surface with well-developed micro-denticles and simple setae ( Fig. 5B, D View FIGURE 5 ). Palp ( Fig. 5G–I View FIGURE 5 ) article-1 about 2.1 times longer than wide, inner margin with eight setulose spiniform setae, longest occurring distally; article-2 longest, about 2.6 times longer than wide, mid-inner margin with eleven setulate setae of unequal lengths ( Fig. 5H View FIGURE 5 ); article-3 shortest, mid-inner margin with cluster of four setulate setae and seven sub-distal and distal setulate setae of different lengths ( Fig. 5I View FIGURE 5 ), with terminal setae being longest.

Labium ( Fig. 5J View FIGURE 5 ). Lobe with inner distal margin setose, with several small “saw-like” spinules. Palp conical, inner margin setulose; outer margin setulose, with two sub-proximal spines; with three distal spiniform setae.

Maxillule ( Fig. 6A–B View FIGURE 6 ). Inner endite with five setulate distal setae, outer margin of inner endite finely setose with sub-proximal tubercle. Outer endite with eleven distal spiniform setae, at least four of them with mid-inner denticulate margin ( Fig. 6B View FIGURE 6 ), and two sub-distal setulate setae, margins finely setose (setae longer on outer margin); palp biarticulated terminating in three long (two sub-distal and one distal) setae, having tip armed with minute recurved spinules.

Maxilla ( Fig. 6C–J View FIGURE 6 ). Inner and outer margins finely setose; outer lobe of movable endite with two long inner pinnate-inner setulose spiniform setae ( Fig. 6D View FIGURE 6 ) and seven slightly shortest inner pinnate spiniform setae ( Fig. 6E View FIGURE 6 ); inner lobe of movable endite with seven inner pinnate-inner setulose spiniform setae ( Fig. 6F View FIGURE 6 ); outer lobe of fixed endite with four simple setae, two bipinnate-plumose spiniform setae ( Fig. 6G View FIGURE 6 ), and three trifurcate-plumose spiniform setae ( Fig. 6H View FIGURE 6 ); inner lobe with five outer bipinnate-outer setulose spiniform setae ( Fig. 5I View FIGURE 5 ), and with ~21 basally swollen setae with bifid tip, sub-terminally ( Fig. 5J View FIGURE 5 ).

Maxilliped ( Fig. 6K–N View FIGURE 6 ). Coxa short and wide. Basis longer than wide, inner sub-distal margin with three welldeveloped setulate setae, outer distal margin with denticles. Palp ( Fig. 6K View FIGURE 6 ) article-1 shortest, inner margin finely setulose with sub-distal setulose setae, outer margin about twice as wide as inner, attenuated forming large lateral spine; article-2 largest, widest distally, inner margin with five setulate setae of varying lengths and row of nine curved simple setae along distal half, outer distal margin with strongly developed spine; article-3 widest in proximal half, inner margin with ten well developed, long, slightly down-curved, setulose setae; article-4 inner margin with seven bipinnate setae and simple seta. Endite ( Fig. 6L–N View FIGURE 6 ) inner margin having three coupling hooks, row of eight basally-swollen setulate setae, with sub-distal bipinnate spiniform seta, five apically bidentate or grooved spiniform setae with outer setulose margin ( Fig. 6M View FIGURE 6 ), increasing size distally, with four outer setulose spiniform setae ( Fig. 6N View FIGURE 6 ), outer margin setulose.

Epignath (not illustrated). Broad, irregularly suboval, terminal seta setulate.

Cheliped ( Figs 7A–I View FIGURE 7 , 14C View FIGURE 14 ). Exopod with three articles, third article bearing four plumose setae. Mucus packets in carpus, propodus, and dactylus ( Fig. 14C View FIGURE 14 ). Basis about 1.4 times longer than wide; ventral margin with spiniform seta on mid-margin (missing in right cheliped ( Fig. 7A View FIGURE 7 ) but present in left cheliped ( Fig. 7B View FIGURE 7 )), and five sub-distal plumose setae; inner face with mid-dorsal margin crenulate, with two mid-medial and two mid-dorsal simple setae ( Fig. 7E View FIGURE 7 ). Merus triangular; ventral margin with mid plumose seta and four simple setae on distal half; mid-outer margin with three plumose setae; inner face with bipinnate spiniform seta ( Fig. 7F View FIGURE 7 ). Carpus about 1.6 time longer than wide, larger than basis, widest distally; ventral margin with ten plumose setae and translucent acute or subacute apophysis; outer margin with row of three sub-proximal plumose setae; sub-distal dorsal margin with translucent acute or subacute apophysis and two simple setae; inner face with sub-distal simple seta on ventral margin ( Fig. 7E View FIGURE 7 ). Propodus about 1.2 times wider than long; ventral margin with two simple setae; outer margin with five spiniform setae (three ventral and two medial) ( Fig. 7C View FIGURE 7 ) and two simple setae near articulation of movable finger; dorsal margin with one sub-proximal and one simple seta distally; inner face with simple seta on outer ventral margin; with spiniform seta on mid-medial margin near articulation of movable finger, and “comb row” of five (one biserrate ( Fig. 7G View FIGURE 7 ) and four inner bipinnate ( Fig. 7H View FIGURE 7 )) setae; fixed finger with three ventral setae; one spiniform seta and five sub-marginal simple setae on outer incisive margin, one tooth, with weakly crenulate dorsal margin after tooth and two proximal simple setae of unequal lengths, claw short; inner face with sub-distal, ventro-lateral spiniform seta, margin proximal to tooth with row of four small spines and after tooth with row of seven small spines ( Fig. 7E View FIGURE 7 ). Dactylus longer than fixed finger, with row of nine (two proximal) spines ventrally ( Fig. 7D View FIGURE 7 ); inner face with three pinnate spiniform setae on sub-distal margin ( Fig. 7I View FIGURE 7 ).

Pereopod-1 ( Figs 8A–F View FIGURE 8 , 15A–B View FIGURE 15 ). Fossorial, strongly developed, with mucus packets on basis, merus, carpus, and propodus ( Fig. 15A View FIGURE 15 ). Coxa, excluding anterior process, sub-quadrate; distoventral margin with four small simple setae and small denticles adjacent to base of coxal process; distodorsal margin with simple seta and translucent rounded apophysis; inner face with row of ten simple setae ( Fig. 8D View FIGURE 8 ); coxal process well-developed, triangular, having length about twice width, becoming distally attenuated, terminating in acute tip; ventral margin asetose; dorsal margin with four translucent acute or subacute apophyses and three setulate setae, distal most buttressed and largest. Exopod with three articles, third article bearing six plumose setae. Basis about 2.1 times longer than wide; distoventral margin with two simple setae and spiniform seta; dorsal margin with row of 5–6 translucent acute or subacute apophyses interspersed in row of 7–8 setulate setae, distal most, being smaller, and sub-distal small simple seta; inner face ( Fig. 8D View FIGURE 8 ) with two small simple setae on ventral margin. Ischium wider than long, with cluster of four simple setae of unequal lengths on distoventral margin ( Figs 8A View FIGURE 8 , 15B View FIGURE 15 ). Merus about 1.4 times longer than wide, widest distally; ventral margin with three simple setae and sub-distal stout spiniform seta; outer margin with three (one ventral and two dorsal) sub-distal simple setae; distodorsal margin with two inner bipinnate spiniform setae ( Fig. 8B View FIGURE 8 ); inner face proximal 1/3 with row of four plumose setae ( Fig. 8E View FIGURE 8 ) and two inner bipinnate spiniform setae extending from mid-face ventrally to dorsal margin, distal half with a row of four setulate setae, and sub-distal row of inner bipinnate spiniform setae. Carpus about 1.2 times longer than wide; ventral margin with two stout spiniform setae; outer distodorsal margin with three simple setae and stout spiniform seta; inner face with semi-circular row of seven inner bipinnate spiniform setae of unequal lengths extending from mid-face ventrally to dorsal margin; distodorsal margin with semi-circular row of seven inner bipinnate spiniform setae being smaller ventrally. Propodus about 1.2 times longer than wide, widest distally; ventral margin with three stout spiniform setae and three simple setae; outer ventral margin with two (one mid and one distal) spiniform setae; dorsal margin with mid plumose seta, one mid simple seta, two (one mid and one sub-distal) bipinnate spiniform setae, and two (subdistal and distal) stout spiniform setae; inner face with one long simple seta and one setulate spiniform seta on distal margin ( Fig. 8F View FIGURE 8 ). Dactylus together with unguis shorter than propodus, dactylus longer than unguis; ventral margin of dactylus with mid spine with acute tip and small distal divide denticle having two small fine setae ( Fig. 8C View FIGURE 8 ).

Pereopod-2 ( Figs 9A–C View FIGURE 9 , 15C View FIGURE 15 ). Longer and less robust than pereopod-1, with mucus packets in basis, merus, carpus, and propodus ( Fig. 15C View FIGURE 15 ). Coxa with plumose seta and translucent acute or subacute apophysis on distoventral margin. Basis about 3.5 times longer than wide; ventral margin with eight simple setae and sub-proximal plumose seta; outer dorsal margin with two PPS; dorsal margin with two curved translucent acute or subacute apophyses and five small simple setae. Ischium wider than long, with four simple stiff setae of unequal lengths on distoventral margin. Merus about 1.4 times longer than wide, widest distally; ventral margin with six simple setae and three stout spiniform setae (one in the middle and two sub-distal); outer ventral margin with simple seta; distodorsal margin with long setulate seta reaching articulation of the carpus and propodus and simple seta. Carpus about 1.5 times longer than wide; ventral margin with four simple setae and three stout spiniform setae (one in the middle and two sub-distal); outer sub-distal margin with row of three simple setae of unequal lengths; outer and inner margin with a crown of six (two of them extending distally over ¾ length of propodus) inner bipinnate spiniform seta of varying lengths. Propodus about 4.3 times longer than wide, length about equal to combined lengths of merus and carpus; ventral margin with four mid-bipinnate spiniform setae (largest distally) ( Fig. 9B View FIGURE 9 ), and two simple setae; outer margin with two (sub-ventral and sub-dorsal) simple setae; dorsal margin with sub-distal PSS and simple seta; inner margin with sub-distal bipinnate seta. Dactylus curved, styliform, acutely tip, together with unguis shorter than propodus, dactylus longer than unguis; dactylus with two (middle and distal) small simple setae on ventral margin ( Fig. 9C View FIGURE 9 ).

Pereopod-3 ( Figs 9D–E View FIGURE 9 , 15D View FIGURE 15 ). Similar to pereopod-2, but shorter, with mucus packets in basis to propodus ( Fig. 15D View FIGURE 15 ). Basis with ventral margin lacking proximal setulate and fewer small simple setae; dorsal margin with proximally curved translucent acute or subacute apophysis. Merus with distodorsal margin having shorter setulate seta, not extending to articulation of the carpus and propodus. Propodus with two distodorsal simple setae ( Fig. 9E View FIGURE 9 ).

Pereopod-4 ( Figs 9F–G View FIGURE 9 , 15E View FIGURE 15 ). Shorter than other pereopods, with mucus packets in basis to propodus ( Fig. 14E View FIGURE 14 ). Coxa with four simple setae of unequal lengths on mid-outer margin. Basis about 2.8 times longer than wide; ventral margin with four (one in the middle, one sub-distal, and two distal) simple setae, with plumose seta and inner bipinnate spiniform seta distally; outer margin with two setulate setae and six simple setae; dorsal margin with three proximal plumose setae, with four small simple setae, and mid-curved translucent acute or subacute apophysis. Ischium wider than long, with three simple stiff setae of unequal lengths on distoventral margin. Merus about 1.3 times longer than wide; ventral margin with four (three sub-distal and one distal (most stout) spiniform setae, and three (middle and two sub-distal) simple setae; distodorsal margin having shorter setulate seta, not extending to articulation of the carpus and propodus. Carpus about 2.3 times longer than wide; ventral margin with three stout spiniform setae and simple setae; outer margin with two stout spiniform seta and two simple setae; sub-distal dorsal margin with simple seta and stout spiniform seta; inner distal margin with three simple setae and stout spiniform seta ( Fig. 9G View FIGURE 9 ). Propodus about 4.3 times longer than wide; ventral margin with three mid-bipinnate spiniform setae, largest distally; dorsal margin with mid plumose seta, and four (two pectinate and two inner bipinnate) spiniform setae; inner sub-distal margin with three pectinate spiniform setae ( Fig. 9G View FIGURE 9 ). Dactylus curved, together with unguis shorter than propodus, dactylus longer than unguis.

Pereopod-5 ( Figs 10A–B View FIGURE 10 , 15F View FIGURE 15 ). Coxa with distoventral simple seta, with mucus packets in basis, merus, carpus, and propodus ( Fig. 15F View FIGURE 15 ); outer margin with two long setulate setae; dorsodistal margin with simple seta. Basis about 2.7 times longer than wide; ventral margin with seven setulate setae of unequal lengths and two simple setae; outer margin with a row of eight long plumose setae being smaller distally; dorsal margin with proximal plumose seta and three small simple setae; inner dorsal margin with two simple setae. Ischium wider than long, with plumose seta and two simple setae on distoventral margin. Merus about 1.9 times longer than wide; ventral margin with four plumose setae and sub-distal stout spiniform seta; outer margin with four (two simple and two setulate) and sub-distal stout spiniform seta; mid-dorsal margin with three very long (extending distally over half length of propodus) plumose setae. Carpus about 1.8 times longer than wide; ventral margin with three stout spiniform setae and simple seta; outer margin with a row of two stout spiniform setae, simple and plumose seta; dorsal margin with two (middle and sub-distal) very long plumose setae; inner margin with three (one long and two small) simple setae. Propodus about 4.1 times longer than wide; ventral margin with three mid-bipinnate spiniform setae, largest distally; sub-distal dorsal margin with simple seta and inner bipinnate seta; inner sub-distal ventral margin with three small spiniform setae and inner sub-distal dorsal margin with plumose seta and simple seta ( Fig. 10B View FIGURE 10 ). Dactylus curved, together with unguis shorter than propodus, dactylus longer than unguis, shallow apophysis ventrally at articulation with propodus; dactylus with two mid-dorsal simple setae; with distal simple seta on ventral margin.

Pereopod-6 ( Figs 10C–E View FIGURE 10 , 15G View FIGURE 15 ). Similar to pereopod-5 but slightly longer, with mucus packets in basis to propodus ( Fig. 15G View FIGURE 15 ). Basis with ten plumose long setae on ventral margin; outer margin with a row of seven plumose setae and three PSS proximally; dorsal margin with translucent acute or subacute apophysis and eight plumose setae. Merus with six plumose setae on ventral margin; outer margin with four plumose setae; mid-dorsal margin with four very long (three extending distally over half length of propodus and one extending distally over proximal length of dactylus) plumose setae; inner sub-distal ventral margin with plumose seta. Carpus with four plumose setae on ventral margin; outer margin with three plumose setae; mid-dorsal margin with three (two middle and one sub-distal) very long plumose setae. Propodus with three slender spiniform setae on ventral margin; outer margin with sub-distal simple seta; dorsal margin with inner bipinnate seta; inner sub-distal margin with simple seta and mid-distal plumose seta; distally with oblique semi-circle of ~25 ( Fig. 10D View FIGURE 10 , ~five of them on outer view ( Fig. 10C View FIGURE 10 )) setulate spiniform, lanceolate setae ( Fig. 10E View FIGURE 10 ).

Pleopods ( Fig. 11A–C View FIGURE 11 ). Five well-developed, biramous pairs. Pleopod-1 ( Fig. 11A View FIGURE 11 ): basal article, 1.4 times longer than wide, shorter than both rami, inner margin with two plumose, setae; exopod shorter than endopod, with 19 plumose setae. Endopod with 19 plumose setae (one seta with whiplike tip ( Fig. 11B View FIGURE 11 )). Pleopods 2–5 ( Fig. 11C View FIGURE 11 ) similar to pleopod-1 but becoming progressively smaller posteriorly and number of plumose setae on both rami decreases.

Uropod ( Fig. 11D–E View FIGURE 11 ). Biramous. Basal article 2.7 times longer than wide, widest distally forming shallow inner distal lobe; sub-distal and distal margin with several plumose setae on dorsal ( Fig. 11D View FIGURE 11 ) and ventral view ( Fig. 11E View FIGURE 11 ). Exopod of three apparent articles or pseudo-articles; article-1 inner margin with mid simple seta; article-2 shorter, asetose; article-3 longest, with three long simple setae of varying lengths. Endopod of 15 articles or pseudo-articles; articles 2, 5, 9, and 13 with 2–3 plumose setae and 1–3 simple setae; articles 1, 3–4, 6–8, 10, 12, and 14 asetose; article-11 with distal simple seta; terminal article with plumose seta and three setae of unequal lengths distally.

Ovigerous female. Similar to non-ovigerous females. Carrying more than ~ 19 eggs.

Body ( Fig. 18B View FIGURE 18 ). Length 3.8 mm.

Adult male. Overall similar to adult females, except in having rostrum with rounded tip but slightly more acute, size of the chelipeds, pereonites 2–5 with hyposphenia, and hyposphenia present in on all pleonites.

Body ( Fig. 19A–B View FIGURE 19 ). Length 2.7 mm.

Cheliped ( Figs 12A–B View FIGURE 12 , 17A View FIGURE 17 ). Robust, with mucus packets in carpus to dactylus ( Fig. 17A View FIGURE 17 ). Exopod with three articles, third article bearing four plumose setae. Basis about 1.4 times longer than wide; ventral margin with stout spiniform seta on mid-margin, and three sub-distal plumose setae; inner face with four (one proximal and three on the middle) small simple setae on dorsal margin ( Fig. 12B View FIGURE 12 ). Merus triangular; ventral margin with plumose seta and simple seta on proximal half, with plumose seta on distal half, and two translucent acute or subacute apophyses subdistally; mid-outer margin with two plumose setae; inner face with mid-outer margin with bipinnate spiniform seta ( Fig. 12B View FIGURE 12 ). Carpus about 1.1 times longer than wide, larger than basis, widest distally; mid ventral margin with two plumose setae, simple seta, and four translucent acute or subacute apophyses, distal with simple seta at base; dorsal margin with a row of five plumose setae, three small simple setae, and mid translucent acute or subacute apophyses with simple seta at base distally; inner face with mid plumose seta after translucent acute or subacute apophysis on ventral margin ( Fig. 12B View FIGURE 12 ). Propodus massive; about 1.1 times wider than long; outer margin with three spiniform setae (two ventral and one medial) and three simple setae near articulation of movable finger; dorsal margin with simple seta distally; inner face with simple seta on ventral margin, with “comb row” of five (one biserrate and four inner bipinnate) spiniform setae on mid-medial margin near articulation of movable finger ( Fig. 12B View FIGURE 12 ); fixed finger with five ventral setae; with three spiniform seta and three sub-marginal simple setae on outer incisive margin, with tooth, with two spiniform setae before and after of base of tooth, and with simple seta at mid-anterior margin of tooth, claw short; inner margin with three (ventral, medial, and sub-distal) simple setae ventro-lateral margin; medial margin with four spiniform seta; dorsal edge with two spiniform setae before and after of base of tooth ( Fig. 12B View FIGURE 12 ). Dactylus longer than fixed finger, with row of eight spines ventrally; inner face with two spiniform setae on sub-distal margin ( Fig. 12B View FIGURE 12 ).

Pereopod-1 ( Figs 13A–B View FIGURE 13 , 17B View FIGURE 17 ). Similar to female, but shorter and the translucent acute or subacute apophysis are bigger and stronger. Dorsal margin of coxal process with two setulate setae. Exopod not shown.

Mucus glands/storage sites ( Figs 14–17 View FIGURE 14 View FIGURE 15 View FIGURE 16 View FIGURE 17 ). Occurring on antennular article-1 ( Fig. 14A View FIGURE 14 ); antennal article-2 ( Fig. 14B View FIGURE 14 ); within carpus to dactylus of female cheliped ( Fig. 14C View FIGURE 14 ) and within carpus to propodus of male cheliped ( Fig. 17A View FIGURE 17 ); within basis to propodus of pereopods 1–6 in female ( Fig. 15 View FIGURE 15 ) and male ( Fig. 17B View FIGURE 17 ); and in pleotelson in dorsal and ventral view ( Fig. 16 View FIGURE 16 ).

Intraspecific variation. Julmarichardia magdae sp. nov. exhibits some degree of variation between left and right side of the same specimen, and among the individuals examined during this study as follows:

(1) Number of articles on the antennular outer and inner flagellum observed on a non-ovigerous, ovigerous females, and males varied from 7–8 and 3–4, respectively.

(2) Number of articles on the uropodal exopod and endopod of a non-ovigerous, ovigerous females, and males varied from 3–4 and 12–15, respectively.

(3) Number of translucent acute or subacute apophysis on basis of pereopod-1 of a non-ovigerous, ovigerous females, and males varied from 5–6.

(4) Number of spiniform setae on the ventral margin of propodus of pereopods 2–3 of a non-ovigerous, ovigerous females, and males varied from 3–4. This number can vary between right and left side of the same specimen.

(5) Number of translucent acute or subacute apophysis occurring in the proximal basis of the pereopod-2 varied from 1–2 (only observed in the left side of an ovigerous female).

(6) Number of translucent acute or subacute apophysis occurring in the proximal basis of the pereopod-4 varied from 1–2 (only observed in both sides of an ovigerous female).

(7) Overall, males having robust symmetrical chelipeds were found most of the time; however, two males were observed having one of the chelipeds (e.g. right for one and left for another) small and thin similar to the female cheliped.

Size-distribution. The non-ovigerous females (females with oostegites) ranged from 1.8 to 3.4 mm (n=13) ( Fig. 18A View FIGURE 18 ). Ovigerous females varied from 2.4 to 3.6 mm (n=12) ( Fig. 18B View FIGURE 18 ). Adult males ranged from 2.4 to 2.8 mm (n=13) ( Fig. 19 View FIGURE 19 ).

Remarks. Based on the dentate basal article of the antenna and the anterior margin of the basis of pereopod-1 having distinct blunt spiniform processes, the new Australian species is referrable to the genus Julmarichardia . It represents the second species described from Australian waters, the first being J. gutui , which was collected from the same general area as part of the same baseline study but in shallow waters depths, usually between 41– 43 m.

Julmarichardia magdae is distinguished from J. gutui and other members of its genus by (1) left lacinia mobilis with six denticles, and (2) pereopod-1 coxal process acute, well-developed, with four translucent acute or subacute apophyses and 2–3 plumose setae on dorsal margin.The new Australian species specifically differs from J. thomassini by having (1) a spatulate rostrum (triangular terminating in acute tip in J. alinati and sub-triangular ending in rounded tip in J. thomassini ), (2) mandible palp article-1 with inner margin bearing eight setulose spiniform setae (four simple setae in both, J. alinati and J. thomassini ), (3) maxillule palp article-2 having three sub-distal/distal setae (two in J. alinati and six in J. thomassini ), (4) maxillipedal basis inner sub-distal margin having three welldeveloped setulate setae (one in both, J. alinati and J. thomassini ), (5) pereopod-1 carpus having ventral margin with two (sub-distal and distal) stout spiniform setae (just one in J. alinati ), (6) pereopod-2 basis having dorsal margin with two curved translucent acute or subacute apophyses (one in J. thomassini ), and (7) pereopod-3 propodus having ventral margin bearing four mid-bipinnate spiniform setae (three in J. alinati ). Julmarichardia magdae can be separated from J. deltoides by (1) a spatulate rostrum (triangular ending in an acute tip in J. deltoides ) and (2) antennule with article-1 having acute short mid-marginal translucent acute apophyses (four to six in J. deltoides ). Julmarichardia magdae can be distinguished from the other species of the genus in the illustrated dichotomous identification key (see below).

Julmarichardia magdae and J. gutui rarely co-occurred at the same site but J. magdae generally occurred in depths ranging from 37 to 83 m, whereas J. gutui occurred in depths between 52 and 86 m ( Table 1 View TABLE 1 ). Currently the two Australian species represent the only sympatric members of the genus. Since our material is limited to the two areas of the Northwest Australian Shelf having depth ranges between 37 and 83 m and 52 and 86 m, respectively, it is not possible to determine the depth limits for the two-species other than that of J. magdae may not exceed 83 m and that of J. gutui is greater than 52 m in this region.

Bamber & Sheader (2005), and Ritger & Heard (2007) extended the known range for genus Julmarichardia westward to Malaysia and eastward to Northwest Australia, respectively, to encompass the east-west breadth of the Indian Ocean ( Fig. 2 View FIGURE 2 ). Bathymetric and distribution data for the genus Julmarichardia is presented in Table 1 View TABLE 1 . Based on the limited data available for the six species of Julmarichardia , J. alinati has both the shallowest (6 m) and deepest (450 m) depth records known for the family. Another species, J. thomassini is known for deep water (250 m), while the four remaining Indo-Pacific species are known from the inner Continental Shelf from depths ranging from 37 to 90 m.

AM

Australian Museum

CSIRO

Australian National Fish Collection

SA

Museum national d'Histoire Naturelle, Laboratiore de Paleontologie