Lagis portus, Zhang & Hutchings, 2019

Zhang, Jinghuai & Hutchings, Pat, 2019, A revision of Australian Pectinariidae (Polychaeta), with new species and new records, Zootaxa 4611 (1), pp. 1-70: 28-35

publication ID

https://doi.org/10.11646/zootaxa.4611.1.1

publication LSID

lsid:zoobank.org:pub:178FED38-5FEA-417F-B5DC-807D943B641C

DOI

http://doi.org/10.5281/zenodo.5670293

persistent identifier

http://treatment.plazi.org/id/586F0669-FF92-FFAE-FF7B-FF66BDC42808

treatment provided by

Plazi

scientific name

Lagis portus
status

n. sp.

Lagis portus   n. sp.

Figs 16–18 View FIGURE 16 View FIGURE 17 View FIGURE 18 , Table 2

Material examined. Australia, New South Wales: Holotype: AM W.33199, Smiths Creek , 33°39’S 151°13’E, seagrass, coll. P.A. Hutchings, 30 Sep 2001 GoogleMaps   . Paratypes: AM W.32543, 3 specs, Pittwater , W of Sand Point, 33°35’45”S 151°18’25”E, 16 m, sandy mud, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 16 Sep 2004 GoogleMaps   ; AM W.51421, 1 spec., Pittwater , W of Sand Point, 33°35’45”S 151°18’38”E, 16.9 m, mud, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 2 Dec 2004 GoogleMaps   ; AM W.51416 and AM W.51417, 2 specs, Pittwater , W of Sand Point, 33°35’49”S 151°18’40”E, 17.6 m, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 16 Sep 2004 GoogleMaps   ; AM W.51418, 1 spec., Botany Bay , W of airport runway 34R, 33°57’43”S 151°11’18”E, 7.6 m, mud, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 1 Dec 2004 GoogleMaps   ; AM W.51419, 1 spec., Botany Bay , W of airport runway 34R, 33°57’57”S 151°11’20”E, 13 m, mud, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 1 Dec 2004 GoogleMaps   ; AM W.51415, 1 spec., Botany Bay , W of end of airport runway 34R, 33°57’58”S 151°11’18”E, 14.1 m, mud, coll. P.A. Hutchings & K.B. Attwood, 15 Sep 2004 GoogleMaps   ; AM W.51420, 1 spec., Botany Bay , E of end of airport runway 34R, 33°58’33”S 151°11’52”E, 18.1 m, mud, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 1 Dec 2004 GoogleMaps   ; AM W. 51393, 1 spec. (mounted for SEM), E of Malabar, Sydney , 33°58’41”S 151°17’51”E, 80.5 m, coll. EPA - Malabar Deep Ocean Outfall Study ( DOOM), 24 Feb 1998 GoogleMaps   .

Other material examined. New South Wales: AM W.33198, 1 spec., Pittwater , W of Sand Point, 33°35’49”S 151°18’50”E, 14.5 m, sandy mud, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 16 Sep 2004 GoogleMaps   ; AM W.28045, 1 spec., Port Jackson , S of Gore Cove, 33°50’25”S 151°11’08”E, 14 m, fine sediment, coll. Australian Museum party - Sydney Ports Survey, 23 May 2001 GoogleMaps   ; AM W.28044, 1 spec., Port Jackson , SW of Darling Harbour, 33°51’17”S 151°12’07”E, 12 m, fine sediment, coll. Australian Museum party, 16 May 2001 GoogleMaps   ; AM W.33197, 1 spec., Botany Bay , W of airport runway 34R, 33°58’00”S 151°11’20”E, 14 m, mud, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 15 Sep 2004 GoogleMaps   ; AM W.33200, 1 spec., Botany Bay , E of end of airport runway 34R, 33°58’38”S 151°12’09”E, 18 m, mud, coll. K.B. Attwood P.A. Hutchings & M.E. Stuckey, 31 Jul 2004 GoogleMaps   ; AM W.32611, 3 specs, Botany Bay , E of end of airport runway 34R, 33°58’44”S 151°11’53”E, 18 m, mud, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 31 Jul 2004 GoogleMaps   ; AM W.51413, 1 spec., Botany Bay , E of end of airport runway 34R, 33°58’36”S 151°12’06”E, 18 m, mud, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 31 Jul 2004 GoogleMaps   ; AM W.32611, 1 spec., Botany Bay , E of end of airport runway 34R, 33°58’44”S 151°11’53”E, 18 m, mud, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 31 Jul 2004 GoogleMaps   ; AM W.51414, 1 spec., Botany Bay , E of end of airport runway 34R, 33°58’44”S 151°11’53”E, 18 m, mud, coll. P.A. Hutchings, K.B. Attwood & C. Fraser, 31 Jul 2004 GoogleMaps   .

Additional material examined. Lagis bocki ( Hessle, 1917)   . Japan: AM W.45878, 1 spec., Minato-Mirai, Yokohama, Tokyo Bay, 35°28’N 139°28’E, coll. E. Nishi, 02 Jun 2011 GoogleMaps   .

Description. Based on holotype and paratypes. Preserved specimens range from pale to black, body conical in shape ( Fig. 17A – B View FIGURE 17 ). Body length 4.7 – 22.0 mm (holotype 22.0 mm) including paleae and scaphe, width 0.5 – 4.5 mm (holotype 4.5 mm) at cephalic regions.

Cephalic veil circular-arched, connected to opercular lateral margin at base of 1 st pair of tentacular cirri, with 10 – 24 (holotype 24) smooth cirri on anterior margin ( Figs 16A – B View FIGURE 16 ; 17A – D View FIGURE 17 ; 18B View FIGURE 18 ). Pair of lateral ear-shaped lobes adjacent to both sides of dorsal base of cephalic veil. Long buccal tentacles with wide longitudinal grooves, arising posterior to cephalic veil ( Figs 16A – B View FIGURE 16 ; 17A, D View FIGURE 17 ; 18B View FIGURE 18 ).

Operculum semicircular; dorsal and lateral margins well developed, smooth; ventral margin (opercular ridge) with 10 – 13 (holotype 13) pairs of golden paleae, curved dorsally, acute with extended tips ( Figs 16A – B View FIGURE 16 ; 17A – C View FIGURE 17 ; 18A View FIGURE 18 ).

First pair of tentacular cirri extending beyond tips of paleae, with annuli, arising from connection of opercular margin and paleal ridge ( Figs 16A – B View FIGURE 16 ; 17B – D View FIGURE 17 ; 18A – B View FIGURE 18 ). Pair of small ventral lappets present posterior to 1 st pair of tentacular cirri ( Figs 16A – B View FIGURE 16 ; 17C – D View FIGURE 17 ).

Second pair of tentacular cirri extending beyond opercular margin, with annuli, on latero-median connecting ridge on segment 2, inserted more dorsally than 1 st pair of tentacular cirri ( Figs 16A – B View FIGURE 16 ; 17B – C View FIGURE 17 ; 18A – B View FIGURE 18 ). Segment 2 with ventral lobes as two pairs of ventro-lateral lobes and narrow mid-ventral lobe about 1/4 width of ventrolateral lobes; outer ventro-lateral lobes shorter than inner ventro-lateral lobes, and separated by shallow grooves from base of 2 nd pair of tentacular cirri ( Figs 16A – B View FIGURE 16 ; 17A, D View FIGURE 17 ). Segment 2 without dorsal lobe.

Comb-like branchiae on segments 3 – 4, consisting of series of dense, flat lamellae ( Figs 16A – B View FIGURE 16 ; 17B – C View FIGURE 17 ; 18A – B View FIGURE 18 ). Branchiae on segment 3 larger and inserted more ventrally than those on segment 4. Pair of small dorso-lateral glandular pads present adjacent to branchiae on segment 3 ( Figs 16A – B View FIGURE 16 ; 17B – C View FIGURE 17 ; 18A View FIGURE 18 ).

Distinct ventral glandular lobes present on segments 3 – 6, becoming progresively more lateral and broader on segments 3 – 5 ( Figs 16A View FIGURE 16 ; 17C – D View FIGURE 17 ). Hump present near branchiae on segment 4. Segment 3 with pair of ventrolateral lobes and a mid-ventral lobe; mid-ventral lobe almost same width as ventro-lateral lobes, curved anteriorly at mid-line. Segment 4 with pair of ventro-lateral lobes and mid-ventral lobe about 1/2 width of ventro-lateral lobes, separated from those by deep grooves. Segment 5 with pair of ventro-lateral lobes and mid-ventral lobe about 1/3 width of lateral lobes, separated from those by shallow grooves. Segment 6 with pair of broad ventrolateral lobes and mid-ventral lobe about 1/2 width of ventro-lateral lobes, separated from those by shallow grooves; mid-ventral lobe with pair of anterior pads, separated from each other by medial groove ( Figs 16 View FIGURE 16 A–B; 17A–C).

Notopodia other than those of segment 1 which bear paleae, on segments 5 – 19 (15 pairs), each bearing two kinds of notochaetae; one winged from anterior row, bordered with serrations along distal portion, short, covered progressively with more spines from about middle to front of wing, on anterior surface; other from posterior row, chaetae long, stout, straight, tapering to an acute tip, covered progressively with more spines from mid-anterior portion to end, on anterior surface ( Figs 16F – G View FIGURE 16 ; 17A – B View FIGURE 17 ; 18F View FIGURE 18 ). Neuropodia, 12 pairs on segments 8 – 19, each with slightly raising torus with transverse row of uncini; each uncinus with U-shaped anterior peg embedded into torus, several rows of minor teeth, and 4 – 5 longitudinal rows of major teeth, each with 6 – 7 teeth ( Figs 16H View FIGURE 16 ; 17A, F View FIGURE 17 ; 18G View FIGURE 18 ). Segments 20 – 21 each with pair of lateral lobes without chaetae ( Figs 16C View FIGURE 16 ; 17F View FIGURE 17 ).

Scaphe ovoidal, flattened dorsally, divided into anterior almost equal five lobes and small rounded lobe on each lateral margin ( Figs 16C – D View FIGURE 16 ; 17A – B, F View FIGURE 17 ; 18C – D View FIGURE 18 ). Anal flap with short anal cirrus, consisting of roundedarched basal lobe and oblong tongue, latero-posterior and posterior margin crenulated ( Figs 16C – D View FIGURE 16 ; 17F – H View FIGURE 17 ; 18C – E View FIGURE 18 ). Scaphal hooks 2 – 4 (holotype four) pairs, amber, curved dorsally, with pointed tips, arranged in two oblique rows on dorsal margin of scaphe ( Figs 16E View FIGURE 16 ; 17I View FIGURE 17 ; 18H View FIGURE 18 ).

Tube with wide opening, straight, fragile wall made of yellow proteinaceous glue, sand grains and shells ( Fig. 17E View FIGURE 17 ).

Methyl Green stained body distinctly green on cirri of cephalic veil, ventral lobes of segments 2–6, base of 2 nd pair of tentacular cirri, dorso-lateral pads of segment 3, lateral lobes on segments 20–21, and ventro-lateral regions near posterior four pairs of lateral lobes on scaphe ( Fig. 17F View FIGURE 17 ).

Variation. Body length 3.5 – 22.0 mm including paleae and scaphe, width 0.5 – 4.5 mm at cephalic regions; 9 – 13 pairs of paleae; cephalic veil with 10 – 24 smooth cirri on anterior margin; scaphal hooks 2 – 4 pairs, usually two pairs. The number of cirri of cephalic veil, paleae and scaphal hooks significantly increase with body size ( Fig. 19 View FIGURE 19 ). The number of cirri of cephalic veil varies more significantly with body size than the number of pairs of paleae and scaphal hooks ( Fig. 19 View FIGURE 19 ).

Distribution. New South Wales ( Fig. 1 View FIGURE 1 ).

Habitat. Found in muddy or muddy sands from intertidal to 80.5 m depth.

Etymology. The species is named from Latin word “ portus   ” as the species was found in harbors and protected bays around Sydney.

Remark. This represents the first record of the genus Lagis   from Australian waters. Lagis portus   n. sp. can be distinguished from other Lagis   species by the following characters: cephalic veil connected to opercular lateral margin; 15 segments with notochaetae, plus notopodial palaea on segment 1 and 12 segments with neurochaeta; anal flap with round-arched basal lobe and long oblong tongue; a pair of dorso-lateral lobes on segment 3; anal flap with anal cirrus and crenulate margin; 2 – 4 pairs of scaphal hooks; 4 – 5 longitudinal rows of major teeth on the uncini (Table 2). Lagis portus   n. sp. is very similar to L. bocki ( Hessle, 1917)   described from Kobe Bay, Japan and shares the following characters: less than four pairs of strongly curved hooks and a crenulated margin of the anal flap. The new species differs from L. bocki   as it typically has less than 20 cirri on the cephalic veil except for the holotype which has 24 cirri; fewer scaphal hooks (usually two pairs), with four pairs only present on larger specimens; broad dorsal margin of scaphe between scaphal hooks; anal flap with broadly rounded basal part and oblong tongue. In contrast, L. bocki   has more (16 – 40) cirri on the cephalic veil, 3 – 4 pairs of scaphal hooks, a relatively narrow dorsal margin of scaphe between scaphal hooks and a long tongue-like anal flap. Nishi et al. (2014) described some material from Japan which they identified as L. bocki   (although they did not examine any type material of Hessle) and they recorded 23–26 cirri on the cephalic veil, 3–4 pairs of scaphal hooks, and a long anal flap for material which varied between 10 – 15 mm in body length. Lagis koreni Malmgren, 1866   (type locality: Stavanger Finnmark, Norway), L. neapolitana ( Claparède, 1869)   (type locality: Gulf of Naples, Mediterranean) and L. tenera Hartmann-Schröder, 1959   (type locality: La Herradura Estero Jaltepeque, El Salvador) all have four pairs of scaphal hooks. Lagis portus   n. sp. differs from L. koreni   which has 3 – 4 longitudinal rows of major uncinial teeth and papillae on lateral margin of scaphe; L. neapolitana   and L. tenera   have smooth margins on the anal flap. Lagis portus   n. sp. which has branchiae on segments 3 – 4, differs from L. abranchiata ( Fauvel, 1932)   (type locality: Cochin Ernakulam, India) and L. crenulatus Sun & Qiu 2012   (type locality: Hong Kong, China) which both lack branchiae. For more details, see Table 2.

AM

Australian Museum