Paramunida tricarinata ( Alcock, 1894 )

Mccallum, Anna W., Cabezas, Patricia & Andreakis, Nikos, 2016, Deep-sea squat lobsters of the genus Paramunida Baba, 1988 (Crustacea: Decapoda: Munididae) from north-western Australia: new records and description of three new species, Zootaxa 4173 (3), pp. 201-224 : 216-219

Paramunida tricarinata ( Alcock, 1894)

( Figs. 2 B–C, 8)

Munida tricarinata Alcock, 1894: 324 (Andaman Sea, 205 m); 1901: 246 (Andaman Sea and Arabian Sea off N. Maldive Atoll, 205–384 m).—Alcock & Anderson 1895: pl. 12, fig. 1 (no record).

Paramunida tricarinata .— Baba 2005: 304 (key, synonymies).— Baba et al. 2008: 175 (list of occurrences).— Baba et al. 2009: 283, figs. 260–261 (Taiwan).— Cabezas et al. 2010: 56 , figs. 15H, 18I (Arabian Sea, Maldives Islands, Andaman Sea, Taiwan and Philippines, 205–384 m. The occurrences in other localities require confirmation).

Paramunida scabra . — Wu et al. 1998: 145, figs 41, 42G ( Taiwan).— Macpherson 1993: 462 (in part) (not P. scabra (Henderson, 1885)) .

Material examined. NMV J56005 , 15 males (cl 10.2–13.7 mm), 15 ovigerous females (10.2–12.8 mm), NMV J55271 , 1 female (7.6 mm), NMV J56017 , 1 male (5.1 mm), north-western Australia, SS05/2007 143 (14°58.362'S 121°38.556'E to 14°57.762'S 121°39.264'E), 232– 228m, 2 July 2007 . NMV J56012 , 1 ovigerous female (14.2 mm), north-western Australia, SS05/2007 95 (17°26.07'S 120°26.112'E to 17°26.598'S 120°26.454'E), 206– 202m, 20 June 2007 . NMV J56013 , 1 male (12.9 mm), north-western Australia, SS05/2007 98 (14°59.424'S 121°39.15'E to 15°0.624'S 121°39.75'E), 206– 187m, 21 June 2007 .

A

D F E

H I G

B C a,b,c 5mm d,e 2mm

f,g,h, i 5 mm Description. Carapace: As long as broad. Spinules on gastric and hepatic regions arising from scale-like striae and with few short uniramous setae. Epigastric region with 2 spines, each behind supraocular spine; with median row of spinules behind rostral spine. Mesogastric region with median row 3 well-developed closely set spines, all subequal or first slightly larger. Cervical groove distinct. Cardiac and anterior branchial regions slightly circumscribed. Cardiac region with median row of 3 well-developed spines. Each branchial region with row of spines near cardiac region. Frontal margin slightly concave. Lateral margins convex, with row of spines and iridescent setae on anterior half. Anterolateral spine well developed, clearly exceeding sinus between rostral and supraocular spines. Rostral spine spiniform, larger than supraocular spines, with thin dorsal longitudinal carina; margin between rostral and supraocular spines slightly concave ( Figs. 8 A, B).

Sternum: Thoracic sternites 4 with some short arcuate striae medially; and sternites 5–6 with numerous lateral striae on lateral sides, sternite 7 smooth ( Fig. 8 C).

Abdomen: Somite 2 as broad as the carapace. Somites 2–3 each with 4 well-developed spines on anterior ridge, 2 median spines on posterior ridge. Somite 4 with 4–6 spines on anterior ridge; median spine on posterior ridge. All ridges with numerous spinules ( Fig. 8 A).

Eyes: Maximum corneal diameter more than one-third distance between bases of anterolateral spines.

Antennule: Article 1 slightly slightly exceeding corneae, with distomesial spine slightly shorter than distolateral spine; about twice longer than wide and with fringe of long setae along lateral margin; lateral margin with straight (distal) portion about half as long as proximal inflated portion ( Fig. 8 D).

Antenna: Anterior prolongation of article 1 clearly overreaching antennular article 1 by about half its length. Article 2 about 1.5 times as long as article 3 and 1.5 times longer than wide, ventral surface with few scales; distomesial spine spiniform, distinctly exceeding antennal peduncle and without tuft of setae, reaching midlength of anterior prolongation of article 1; distolateral spine reaching or slightly exceeding end of article 3, sometimes with small lateral spine. Article 3 slightly longer than wide and unarmed ( Fig. 8 D).

Mxp 3: Ischium about twice length of merus measured along extensor margin, flexor margin bearing long distal spine; merus with well-developed median spine on flexor margin; extensor margin unarmed ( Fig. 8 E).

P1: Long and slender, squamate, 4.3–5.1 times carapace length; carpus 0.9–1.1 times palm length, 5.2–5.7 times longer than high; palm 1.3–1.5 times finger length. Base of carpus without bundle of setae ( Fig. 8 F).

P2–4: Long and slender, with numerous scales on lateral sides of meri, carpi and propodi; scales with short setae. P2 3.1 times carapace length, merus 1.3–1.4 as long as carapace, 7.3–9.3 times as long as high, 3.4–4.0 times as long as carpus and 1.7–1.8 times as long as propodus; propodus 7.8–9.0 times as long as high, 1.4–1.6 times dactylus length. Merus with well-developed spines on extensor border, flexor margin with few spines and welldeveloped distal spine; row of small spines along flexolateral margin. Carpus with small extensor marginal spines, well developed distal spine on extensor and flexor margin. Propodus with small movable flexor marginal spines. Dactylus compressed, slightly curved, with longitudinal carinae along mesial and lateral sides, flexor border unarmed. End of P2 carpus not reaching end of P1 merus. P3 with similar spination and article proportions as P2; merus as long as P2 merus; propodus and dactylus slightly longer than those of P2. P4 slightly longer than P2; merus 1.2 times carapace length; propodus and dactylus as long as those of P3; merocarpal articulation exceeding end of anterior prolongation of article 1 of antennal peduncle ( Figs. 8 G–I).

Colour in life. Carapace and abdomen orange and white. Rostrum and supraocular spines orange. Anterior branchial region with patches of white. P1–5 with orange-red bands and speckles ( Fig. 2 B,C).

Remarks. This material shows some differences from the described material of P. tricarinata . A full description and illustrations are thus provided to assist with future revision of the species. Paramunida tricarinata was originally described from the Andaman Sea ( Alcock 1894) and subsequently reported from Madagascar, Zanzibar, the Arabian Sea, Maldives Islands, Taiwan and the Philippines ( Alcock 1901; Baba et al. 2009; Cabezas et al. 2010). The wide distribution of P. tricarinata suggests that could represent a complex of species ( Cabezas et al., 2010). Recently, two new species similar to P. tricarinata were described from the western Indian Ocean ( P. marionis from Madagascar; P. mozambica from Mozambique; see Cabezas et al. 2010), which raises doubt as to the identity of historical records of P. tricarinata from the western Indian Ocean . The problem with delineating any new species from P. tricarinata , is that no recent illustration or description of the holotype from the Andaman Sea exists (lodged with the collection of the Zoological Survey of India, Calcutta ). This western Australian material shows some differences from other described material of P. tricarinata . Our material differs from the Taiwan / Philippines material of P. tricarinata as described by Cabezas et al. (2010) in the following characters:

- the distolateral spine of antennal article 2 reaches or slightly exceeds the end of the third article, whereas according to Cabezas et al. (2010) it never reaches the end of that article

- the distomesial spine of antennal article 2 extends far beyond the end of the antennal peduncle whereas in the Taiwan material it only slightly overreaches the peduncle.

The TN genetic divergence between P. tricarinata from north-western Australia and Taiwan is 0.008 (± 0.004). The TN divergence between P. a s c el l a and P. tricarinata is 0.018 (± 0.004).

Distribution. Arabian Sea, Maldives Islands, Andaman Sea, Taiwan, Philippines, and now north-western Australia. 187– 384 m.

Figures

FIGURE 2. A, Paramunida christinae sp. nov. unspecified specimen (NMV J 56023); B – C, Paramunida tricarinata (Alcock, 1894), female, cl 14.2 mm (NMV J 56012), male, cl 5.10 mm (NMV J 56017). Photos: K. Gowlett-Holmes.