Julmarichardia gutui, Ritger, Rebecca Kirk & Heard, Richard W., 2007

Ritger, Rebecca Kirk & Heard, Richard W., 2007, Julmarichardia gutui, a new species of Apseudomorph Tanaidacean (Crustacea: Malacostraca: Peracarida) from the Australian northwest continental shelf, Zootaxa 1559, pp. 59-68 : 60-68

publication ID	https://doi.org/ 10.5281/zenodo.178310
DOI	https://doi.org/10.5281/zenodo.6242397
persistent identifier	https://treatment.plazi.org/id/03CB8795-FF98-FFDC-37AA-FE9EFA9A92BC
treatment provided by	Plazi
scientific name	Julmarichardia gutui
status	sp. nov.

Treatment

Julmarichardia gutui n. sp.

( Figures 1–4)

Material examined. All specimens collected using an epibenthic sled during the Northwest Shelf Project, Western Australia by CSIRO on FRV “Soela.”— Holotype: adult ɗ, 3.3 mm TL, (AM P.52381), sta S05-83- B5, 19° 04.8' S – 118° 50.7' E, 30 Oct 1983, depth 81 m. Paratypes: 4 adult ɗɗ (AM P.68077), 5 adult ΨΨ (AM P68078).— 2 adult ɗɗ, 2 adult ΨΨ, BMNH 2004.660-633.—2ΨΨ, 2 ɗɗGCRL 2069.— 1 adult ɗ, 2 adult ΨΨ (MNINGA 250.261).— 1 adult ɗ, 1 adult Ψ, USNM 0 0 0 0 0 0. All paratypes have the same collection data as the holotype.

Additional material: 7 ɗɗ, 14 ΨΨ, 16 juvs, AM. P.68079, same collection data as holotype.— 1 adult ɗ, 1 adult Ψ, sta S05-83-B4, 19° 05.4' S, 118° 53.9' E, depth 81 m, 30 Oct 1983.— 2 adult ɗɗ, 1 adult Ψ, AM P56742, sta 01-B5-S, 19° 4.8– 19 ° 4.6' S; 118° 50.8'– 118° 50.2' E, depth 82–83 m, 15 Feb 1983.— 2 adult ɗɗ, 4 adult ΨΨ, 9 subadults, AM P56747, sta 03-B05-S, 19° 4.6' S – 19° 4.9' S, 118° 51.2' – 118° 50.7' E, depth 82– 83 m, 29 Jun 1983.— 2 adult ɗɗ, 3 adult ΨΨ (1 ovig.), AM P52341, sta S06 –82-B10, 19° 08.4'– 19° 08.6' S, 119° 02.4'– 119 02.7' E, depth 78 m, 11 Dec 1982.— 5 adult ɗɗ, 6 adult ΨΨ (1 ovig.), 5juvs, AM P 52354, sta S01-83-B6, 19° 04.4' – 19° 04.3' S, 118° 47.5'– 118 47.9' E, depth 83 m, 16 Feb 1983.— 26 adult ɗɗ, 39 adult ΨΨ,(6 ovig.), 5 juveniles, AM P52358 sta S04-83-B11, 19° 0 4.3 '– 19° 04.4' S, 119° 00.6'– 118° 59.8' E, depth 83 m, 0 1 Sep 1983.— 12 adult ɗɗ, 14 ΨΨ, 15 adult ΨΨ (1 ovig.) 7 juvs, AM P 52376, sta S05-83-B4, 19° 05.4'– 19° 05.2' S, 118° 53.9'– 118° 54.1' E, depth 81 m, 30 Oct 1983.— 26 adult males, 39 adult ΨΨ (6 ovig.), AM P52358, sta. SO4- 83-B11, 19° 04.3'S, 119° 03.1' E, 83 m, 1 Sept 83.— 2 adult ɗɗ, 2 adult ΨΨ, AM P 52211, sta S06-82-B12, 19° 0 3.0 – 19° 03.2' S, 119° 02.4'– 119° 02.1' E, depth 80 m, 12 Dec 1982.— 7 adult ɗɗ, 7 adult ΨΨ, 12 juvs/SA, AM P52390, sta SO3-83-B4, 19° 05.0'– 19° 05.1'S, 119° 02.4'E – 119° 02.1'E, depth 82 m, 29 Jun 83. — 3 ΨΨ, AM P52368, sta S03-83-B12, 19° 03.0'– 19° 03.4'S, 119° 04.1'– 119° 03.7' E, depth 83m, 30 Jun 1983.—7 ɗɗmales, 8 adult ΨΨ (1 ovig.), AM P52372, sta S01-83-B4, 19° 05.4– 19° 05.1'S, –118° 54.0'– 118° 53.4' E, depth 83m, 15 Feb 1983.— 10 adult ɗɗ, 24 adult ΨΨ (3 ovig.), 11 juvenile /subadult, AM P52388, sta SO5-83-B6, 19° 04.1'– 19° 04.7'S- 118 47.8'– 118° 47.2' E, depth 82m, 30 Oct 1983.— 1 adult ɗ, 3 adult ΨΨ, AM P52374, sta S02-83-B4, 19° 05.4'S, 118° 53.3'– 118° 54.1' E, depth 83m, 27 April 1983.

Diagnosis: Rostrum, flexed antero-ventrally; spatulate, broader in female than in male, distally rounded, margins fringed with 6–8 plumose setae and armed with 20 or more small blunt teeth of varying size. Anterior region of carapace have crenulated median lobe with lateral crenulated ridges extending towards bases of antennules; pair of spines present at base of rostrum. Antennule with inner flagellum having 6–7 articles, only 2 aesthetascs present on distal most articles in both sexes; outer flagellum with 4–5 articles. Pereopod 2 with 3–5, usually 3, spinose processes (denticles) on anterior margin of basis.

Description: Adult male.

Body ( Fig. 1) lateral view; ( Fig. 2 View FIGURE 2 B) dorso-ventrally flattened. Body length 2.9–3.7 mm.

Carapace ( Fig. 2 View FIGURE 2 B, D). Ocular lobes pointed. Eyes present, with visual elements. Rostrum ( Fig. 2 View FIGURE 2 C) deflected antero-ventrally, well-developed, spatulate, having margin armed with 16 to over 25 small teeth or denticles, plumose setae present between teeth; anterior region of rostrum having crenulated median lobe with lateral crenulated ridges extending towards bases of antennules; a pair of spines present at base of rostrum.

Pereonites ( Fig. 2 View FIGURE 2 A) wider than long, decreasing in width posteriorly

Pleonites ( Fig. 2 View FIGURE 2 B) subequal, short and wide, each with lateral margins armed with denticulate triangulate-like lateral process bearing single plumose setae at or near apex. Each pleonite with 1–2 short broom setae on anteromedial margin.

Pleotelson ( Fig. 2 View FIGURE 2 B, H) Short, weakly pointed at terminus, with lateral expansion in the anterior half.

Antennule ( Fig. 2 View FIGURE 2 E) having peduncle with 4 articles; peduncular article 1 approximately 3.7 times longer than article 2, outer margin with 5–8 spiniform prolongations with accessory setae, inner margin with 1 or 2 blunt spines, distal half usually with row of small spinules and some broom seta; article 2 peduncle with inner margin bearing 1 short simple seta and long simple seta distally; outer margin with 1 short simple seta and 1 long simple seta distally; article 3 peduncle with inner margin bearing 1 long simple seta distally; article 4 peduncle with projection at junction with outer flagellum. Inner flagellum with 6 articles, article 5 with short medial seta at midline; total of two aesthetascs arising from distal most articles. Inner flagellum with 4 apparent articles bearing 1–2 simple long distal setae, last article with 2 terminal setae.

Antenna ( Fig. 2 View FIGURE 2 F) usually with 10 articles. Article 1 short, longer than wide, with prominent spatulate process on inner margin. Article 2 strongly developed, approximately 5 times longer than article 3, outer margin bearing 1 plumose seta proximally, 1 plumose seta at 10–14 distal teeth mid-length on outer margin and 1 medial plumose seta; inner margin armed with 10–14 distal teeth with 5–8 plumose setae; squama narrow subcylndrical with 4 long and 2 short simple setae; article 3 with 2 broom setae on distal inner margin; article 3 bearing 3 brush setae and 2 long simple setae distally; article 4 with 4 long setae distally; articles 5–9 with 1– 4 distal setae, last article with 4 terminal setae.

Clypeolabral complex ( Fig. 3 View FIGURE 3. A D). Clypeus simple, hood-shaped. Labrum subdivided in two parts by labral suture bearing fine setae, posterior half bilobed with inner margins of lobes fringed with fine setae.

Mandibles ( Fig. 3A View FIGURE 3. A ) (adult female). Left mandible with tridentate lacinia mobilis; quadradentate pars incisiva; setiferous lobe with 4 forked spiniform setae. Right mandible having setiferous lobe with 1 large bidentate, distally expanded setae; and 4 smaller distally bifid or trifid spiniform setae. Palp with 3 articles, first bearing 7 long simple setae on inner margin; second slightly longer than first, inner margin with 10 long simple setae and 1–2 pinnate setae distally, 1 long simple seta on outer margin; article 3 having 13–14 long simple setae on inner margin, 4 simple setae on outer margin, 4 long simple terminal setae.

Labium ( Fig. 3 View FIGURE 3. A E) with large terminal palp, bearing 3 spiniform setae proximally, outer margin bearing several spines and fine hair-like setae, inner margin with row of long fine setae. Basal lobes with a fine row of hair-like setae on distal half of inner side.

Maxillule [Maxilla 1] ( Fig. 3 View FIGURE 3. A G) having outer endite with 11 terminal spiniform setae 1 short, stout vestigial seta, and 2 subterminal, stout setae, proximal outer margin bearing row of short, fine hair-like setae, distal outer margin bearing row of short, simple setae, inner margin bearing row of short simple setae; inner endite bearing 1 long simple seta and 4 distally setulose setae; palp 2-articled, with 1 long, terminal seta with spoonshaped tip, 2 medium-length and 2 shorter subterminal setae with spoon-shaped tips and armed distally with fine, recurved setules.

Maxilla [maxilla 2] ( Fig. 3 View FIGURE 3. A H, H') having outer lobe with 18–22 finely plumose setae and 2 distally serrate setae; medial lobe armed terminally with 3 tridentate spines and 8 setae, 2 of which pinnate. Movable inner lobe with 7 simple setae, movable endite having 2 lobes, outer lobe with outer distal margin bearing 2 subterminal and 5 terminal pinnate setae, outer margin with 2 protuberances bearing small spinules.

Maxilliped ( Fig. 3 View FIGURE 3. A I, I') with coxa subrectangular; basis subquadrate with distal outer margin armed with row of 6–10 short, stout spines. Palp: Article 1(twisted nearly 180 degrees in illustration) with lateral margin bearing 4 lateral plumose setae and large subterminal spiniform seta; inner margin with 16–18 marginal setae, outer margin with 4 short terminal spiniform setae. Article 2 with 1 large, stout, distolateral spiniform seta; inner margin with 11 long, simple setae, 3 long, plumose setae. Article 3 with 6 long, simple setae. Article 4 with 7 long, simple setae and 2 distally pinnate setae along inner margin, 4 long, simple terminal setae. Endite long and narrow, bearing 8 stout plumose marginal setae; 3 marginal coupling hooks medially; 3 stout, spiniform setae on distal margin being scalloped and weakly bidentate distally.

Epignath ( Fig. 3 View FIGURE 3. A F) greatly expanded, oval; terminal seta, large, setulate; anterior lobe fringed with short setules; 1 proximal accessory plate.

Cheliped ( Fig. 4A View FIGURE 4. A , B). Basis short and thick, small spur (stout spiniform seta) on midventral margin, plumose setae on distoventral margin. Merus reduced with ventral margin having plumose setae and several small simple setae. Carpus larger than basis, 3 denticles on dorsal margin, 2 plumose on distal half of ventral margin. Propodus with palm longer than fixed finger; fixed finger with proximal cusp and 2 blunt teeth separated by shallow notch, cutting edge weakly denticulate with short spines. Dactylus slightly longer than fixed finger. Tips of propodus and dactylus (fixed and movable fingers) smooth, scarified, and orangish in color. Exopod present, with 2 apparent articles, distal article bearing 5 plumose setae.

Pereopod 1 ( Fig. 4 View FIGURE 4. A E, F, G) ambulatory/fossorial. Coxal process or spine well developed, bearing long plumose setae inserted between 6–8 denticles. Basis longer than ischium, merus, and carpus combined, one distal seta on posteromedial margin, anterior margin with five blunt spiniform processes alternating with long plumose setae. Ischium with 1 simple seta and 1 short plumose seta on posterodistal margin. Merus longer than carpus and propodus combined, 5–7 medium to long simple setae on anterior margin, several short pinnate setae on posterior margin, stout spiniform seta and 2 simple setae arising on or near posterodistal margin. Carpus about as deep and long, anterodistal margin armed with one spiniform seta, and anterodistal and anterior margins with 7–9 simple setae, posterior margin with 5 setae and 2 stout spiniform setae. Propodus expanded, about same length as carpus; 1 small stout spiniform seta and 1 large spiniform seta with interspersed simple setae on distal half of anterior margin, posterior margin with 3 stout spiniform setae and 4 simple setae. Dactylus stout and smooth, unguis less than third of length of article, with subacute tip. Exopod present, with 2 articles, distal article bearing 5 plumose setae.

Pereopod 2 ( Fig. 5A View FIGURE 5. A , B) (adult female) ambulatory. Basis about equal to combined length of merus, ischium, and carpus, 3 to 5 (usually 3) blunt spines on anterior margin, several plumose setae on posterior and anterior margins, 2 short brush setae near articulation with coxa, 1 short subdistal seta and 1 long distal simple setae on posterior margin. Ischium with posterodistal margin bearing 2 short, simple setae. Merus with 2 or 3 plumose seta on anterior and posterior margins, 1 small simple seta proximally and 1 short spiniform seta distally on posterior margin. Carpus almost as long as merus, with 2 or 3 plumose setae on anterior and posterior margins; 3 short spiniform, setae on distal half posterior margin and 2 on distal margin. Propodus about equal in length to merus and carpus combined, with row of 4 strong, spiniform setae along posterior margin interspersed with 2 or 3 simple setae, anterior margin bearing 2 distal simple setae and 1subdistal brush seta. Dactylus, narrow, curved, almost as long as propodus, unguis acutely tipped, over third length of entire article.

Pereopod 3 ( Fig. 5 View FIGURE 5. A C) generally similar to pereopod 2. Basis with anterior margin with 2 blunt spines and 2 brush setae near articulation with coxa, and 1 small simple and 3–4 plumose marginal setae; posterior margin with 6–7 plumose setae. Ischium with 1 short, simple and 2 short, plumose setae. Merus with 2 stout spiniform setae on posterodistal margin, 2 or 3 long plumose setae on anterior margin and 3–4 on posterior margin. Carpus longer than merus, anterior margin with 2 distal broom seta and 3 subdistal simple setae; posterior margin with 4 stout spiniform setae; distomedial margin with 2 stout spiniform setae. Propodus and dactylus as in pereopod 2.

Pereopod 4 ( Fig. 5 View FIGURE 5. A D, E). Basis bearing 1 short spine at articulation with coxa, anterior and posterior margins with several plumose setae. Ischium without setae. Merus comparatively shorter than those on other pereopods, with several small plumose setae and 2 stout spiniform setae distally. Carpus distinctly longer than merus, with medial row of 3 short spines on ventral margin, 2 short spines on anterodistal margin, 2 short spines on posterodistal. Propodus with row of 3 short spiniform setae posteromedially, 5 pinnate setae on distoventral margin. Dactylus much shorter than those of other pereopods.

Pereopod 5 ( Fig. 5 View FIGURE 5. A F, G) basis with long plumose setae on both margins, 2 broom setae anteroproximal, 1 short blunt spine on anteroproximal margin. Ischium with short plumose and short simple setae, Merus bearing 2 long seta distally on anterior margin, row of short plumose on posterior margin, 1 short spine posterodistal. Carpus with row of 4 stout spiniform setae from mid-length to distal edge of posterior margin, 2 long plumose on anterior margin, several short plumose along distomedial edge. Propodus with 1 brush seta and 2 short simple setae anterodistally, row of short spines from proximal to distal edge of posterior margin. Dactylus and unguis combined subequal in length to propodus, similar to those on pereopods 2 and 3, but stout (not as styliform), distinctly longer than that of pereopod 4.

Pereopod 6 ( Fig. 5 View FIGURE 5. A H, I): similar to pereopod 5, except for propodus having dense row of 15–18 fine comb (pectinate) setae circling distal margin.

Pleopods. (adult female) Biramous, five pairs, well developed. Pleopod 1 ( Fig. 4 View FIGURE 4. A J) bearing terminal setae longer than exopod, endopod and exopod bearing many (30–40) long plumose setae, pleopods 2–5, like pleopod 1, but becoming progressively smaller and less setose posteriorly ( Fig. 5 View FIGURE 5. A K).

Uropod ( Fig. 5 View FIGURE 5. A L, M). Basal article with 2 distomedial setae; exopod appearing 3-articulate (possibly uniarticulate with pseudo articulations); endopod with 9 apparent articles, bearing irregularly scattered setae distally, last article with 4 long plumose terminal setae and 2 broom setae.

Adult female: Body length from 3.6–5.0 mm, generally larger than adult males. Rostrum generally broader and with more marginal teeth (25–30) than in adult male. As in male total of only two aesthetascs arising from distal most articles. Chela less massive than in male ( Fig. 4 View FIGURE 4. A C, D), carpus relatively narrow, long, and with compared to male. Pereopods similar to those of male, pereopod 2 having frontal margin of basis usually armed with 3 to 4 spines. Oostegites typical of family, pair on each of first 4 pereonites.

Sexual dimorphism: Besides typical secondary sexual characters (penes in the males and oöstigites in preincubatory and incumatory females), the sexes of J. gutui are quite similar morphologically. The males generally have shorter bodies and more robust chelae, but in both sexes the main flagellum of the antennule bears only two subterminal aesthetascs. The pereopods of both sexes are similar.

Etymology: The species is named in honor of Dr. Modest Guţu, Muzeul National de Istorie Naturala “Grigore Antipa,” Bucharest, Romania, the well-known apseudomorphan specialist, who originally designated the genus Julmarichardia .

Remarks: Julmarichardia gutui , n. sp. can be distinguished from the other members of the genus by a combination of characters including having (1) a spatulate rostrum with plumose setae, (2) distinctive armature (spines and tubercles) on the anterodorsal region of the carapace, (3) pereopod 1 with strongly developed, relatively broad, coxal process with 6–7 marginal denticles interspersed with 4–6 plumose setae, and (4) pereopod 2 with anterior margin of the basis armed with 3–5 spines. The following key further distinguishes the currently known species of Julmarichardia .

Key to adults of the known species of the genus Julmarichardia Gu ţ u, 1989 (modified in part from Guţu 1989)

1 Antennule with outer flagellum having at least 10 distinct articles ............................................................ 2

1' Antennule with outer flagellum having at most 9 distinct articles ............................................................. 3

2 Antenna with 10 articles .......................................................................................................... J. thomassini

2' Antenna with 12 articles ............................................................................................................. J. deltoides

3 Rostrum triangular ending in an acute tip, having 12–14 acute marginal teeth. Antennule with inner flagellum having 3 articles. Antenna with article 2 having 5–6 strong teeth on inner margin and except for 1 strong distolateral tooth, lateral margin unarmed ........................................................................... J. alinati

3' Rostrum subtriangular or spatulate with rounded tip, having 18 or more blunt marginal teeth of varying sizes. Antenna with article 2 either lacking medial and lateral spines or having at least 2 or more spines on both inner and lateral margins .................................................................................................................... 4

4 Rostrum lacking long marginal plumose setae; pair of simple setae present bear base just posterior to serrate margin. Carapace with lacking noticeable ridges or tubercles. Antenna with article 1 lacking welldeveloped, expanded lateral lobe (at most subacute process present); article 2 lacking distinct spines on both inner and lateral margins, inner proximal margin expanded into broad flattened lobe. Pereopod 2 with 1–2, usually 2, spinose processes on the frontal margin of basis. ......................................................... ........................................................................................... Julmarichardia bajau Bamber & Sheader, 2005

4' Rostrum with 4–8 long marginal plumose setae, pair of present at base; no pair of simple setae present near base. Carapace with anterior region at base of rostrum having crenulated median lobe with lateral

crenulated ridges extending towards bases of antennules. Antenna with article 1 having well developed, expanded lateral lobe; article 2 with distinct spines on both inner and lateral margins, inner proximal margin represented by spinose process (not expanded into broad flattened, unarmed lobe). Pereopod 2 with 3– 5, usually 3, spinose processes on the frontal margin of basis ......................... Julmarichardia gutui , n. sp.

This paper and that of Bamber and Sheader (2005) establish the known range for Julmarichardia over 7500 km eastward to Australia and Malaysia, respectively, thus widening the range of the genus to encompass the east-west breadth of the Indian Ocean. Julmarichardia gutui appears to have a mid-shelf bathymetric range 80–83 m; whereas, Guţu (1989) reports J. alinati as having a very wide depth range from shallow shelf (6 m) to the upper slope (450 m). The other species, J. deltoides and J. thomassini , are known from 90 and 250 m, respectively. Bamber and Sheader (2005) report the Malaysian species J. bajau from depths between 23 and 35 m.

The genus Julmarichardia was placed in the family Metapseudidae by Guţu (1989), but the presence of a prominent coxal process on the first pereonite (thoracic segment 3), a feature that is generally used to characterize members of the family Apseudidae , presents taxonomic and systematic problems. Except for the welldeveloped coxal process on pereopod 1 and the unique rostrum, Julmarichardia shares many morphological features with the metapseudid genus Calozodion Gardiner, 1975 ( Guţu 1989, Bamber and Sheader 2005). Regarding the coxal process on pereopod 1 and the unique rostrum of Julmarichardia , we consider them to be an independently derived. If, however, these characters prove to be plesiomorphic, then the genus may be an important systematic marker in the evolution of the Metapseudidae from an apseudid-like progenitor.