Paramunida crinita, Cabezas, 2010

Cabezas, P. E., 2010, Taxonomic revision of the genus Paramunida Baba, 1988 (Crustacea: Decapoda: Galatheidae): a morphological and molecular approach, Zootaxa 2712, pp. 1-60 : 18-20

Paramunida crinita n. sp.

( Figs. 4, 12G)

Paramunida scabra Macpherson, 1993: 462 (in part, only specimens from the Philippines, MUSORSTOM 1, 2 and 3).

Material examined. Holotype: Philippines. MUSORSTOM 2, Stn CP 80, 13°45'N, 120°38'E, 01 December 1980, 178– 205 m: M 7.8 mm (MNHN-Ga7478).

Paratypes: Philippines. MUSORSTOM 2, Stn CP 80, 13°45'N, 120°38'E, 01 December 1980, 178– 205 m: 15 M 6.4–10.2 mm, 11 ov. F 6.7–10.2 mm, 1 F 6.0 mm (MNHN-Ga, 3437, 7479). MUSORSTOM 3. Stn CP 90, 14°00'N, 120°19'E, 31 May 1985, 195 m: 13 M 8.3–10.2 mm, 4 F 9.2–10.6 mm (MNHN-Ga3444, 7480) .

Etymology. From the Latin crinis, hair, in reference to the long setae along the cervical groove.

Description. Carapace: As long as broad. Spinules on gastric and hepatic regions forming groups arising from scale-like striae and with few short uniramous setae. Long and dense setae along anterior branch of cervical groove. Epigastric region with 2 spines, each behind supraocular spine, with median row of minute spinules behind rostral spine. Mesogastric region with one median spine. Cervical groove distinct. Cardiac and anterior branchial regions slightly circumscribed. Cardiac region with a median row of 3 well-developed spines, first thicker than others. Each branchial region with row of spines near cardiac region. Frontal margin slightly concave. Lateral margins convex, with some spines and iridescent setae on anterior half. Anterolateral spine well developed, clearly exceeding sinus between rostral and supraocular spines. Rostrum spiniform, larger than supraocular spines, with thin dorsal longitudinal carina; margin between rostral and supraocular spines straight or slightly concave ( Figs. 4A, B).

Sternum: Thoracic sternites 4–6 with some arcuate striae, sternite 7 smooth ( Fig. 4C).

Abdomen: Abdominal somites 2–3 each with 4 well-developed spines on anterior ridge, posterior ridge with 2 median spines. Abdominal somite 4 with 4 spines on anterior ridge; posterior ridge with distinct single median spine ( Fig. 4A).

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

Antennule: Segment 1 exceeding corneae, with distomesial spine small and slightly shorter than distolateral; about twice longer than wide and with fringe of long setae along lateral margin; lateral margin with distal slender portion about half as long as proximal inflated portion. ( Fig. 4D).

Antenna: Anterior prolongation of segment 1 clearly overreaching antennular segment 1 by about onethird of its length. Segment 2 about twice length of segment 3 and twice longer than wide, ventral surface with scales; distomesial spine spiniform, not exceeding antennal peduncle, overreaching midlength of anterior prolongation of segment 1, distolateral spine not reaching end of segment 3; segment 3 about as long as wide and unarmed. Distomesial spine segment 2 shorter than the rest of the segment ( Fig. 4D).

Maxilliped 3: Ischium about twice length of merus measured along dorsal margin, distoventrally bearing long spine; merus with well developed median spine on flexor margin; extensor margin with distal spine (Fig.

Pereopod 1: Long and slender, squamate, 5.0–5.7 times carapace length; carpus 0.8 times palm length, and 7.2–7.7 times longer than height; palm 1.5 times fingers length. Base of carpus without bundle of setae ( Fig. 4F).

Pereopods 2–4: Long and slender, with numerous scales on lateral sides of meri, carpi and propodi; scales with short setae. P2 3.1–3.7 times carapace length, merus 1.4–1.5 times longer than carapace, 10–11 times as long as high, 3.6–4.1 times as long as carpus and 1.5–1.7 times as long as propodus; propodus 10.3–11 times as long as high, and 1.4–1.8 times dactylus length. Merus with well developed spines on dorsal border, increasing in size distally, ventral margin with few spines and one well-developed distal spine; row of small spines along ventrolateral margins. Carpus with some small dorsal spines, well developed distal spine on dorsal and ventral margin. Propodus with small movable ventral spines. Dactylus compressed, slightly curved, with longitudinal carinae along mesial and lateral sides, ventral border unarmed. End of P2 carpus nearly reaching end of P1 merus. P3 with similar spination and segment proportions than P2; merus as long as P2 merus; propodus and dactylus slightly longer than those of P2. P4 slightly shorter than P2; merus 1.2–1.4 times carapace length; propodus and dactylus slightly shorter than those of P3; merocarpal articulation slightly exceeding end of anterior prolongation of segment 1 of antennal peduncle ( Figs. 4G–I).

Remarks. Paramunida crinita n. sp. resembles P. ascella n. sp. from Vanuatu. The two species can be differentiated by the presence of one mesogastric spine in P. crinita in contrast to the 3 spines presented in P. ascella . Furthermore, the distomesial spine of the antennal segment 2 is mucronated in P.ascella , whereas this spine is spiniform in P. crinita .

The genetic divergences between P. ascella and P.crinita were 1.18% (16S rRNA) and 2.51% (ND1).

Distribution. Philippines, between 178 and 205 m