Munida squarrosa, Macpherson, 2009

Macpherson, Enrique, 2009, New species of squat lobsters of the genera Munida and Raymunida (Crustacea, Decapoda, Galatheidae) from Vanuatu and New Caledonia, Zoosystema 31 (3), pp. 431-451 : 445-446

publication ID	https://doi.org/ 10.5252/z2009n3a3
persistent identifier	https://treatment.plazi.org/id/03BE7E23-FFEF-9250-FF0B-D5F9FB40FCE9
treatment provided by	Marcus
scientific name	Munida squarrosa
status	sp. nov.

Treatment

Munida squarrosa n. sp.

( Fig. 6 View FIG )

HOLOTYPE. — Vanuatu. SANTO 2006 , stn AT09, 15°41.5’S, 167°01.3’E, 481 m, 17.IX.2006, 1 ♂ 10.6 mm ( MNHN Ga 6712). GoogleMaps

ETYMOLOGY. — From the Latin, squarrosus, rough, in reference to the numerous scales in the pereiopods.

DISTRIBUTION. — Vanuatu, 481 m.

DESCRIPTION

Carapace 1.2 times longer than wide, slightly convex. Transverse ridges mostly interrupted in cardiac region, with dense short, non-iridescent setae; some uniramous iridescent setae along lateral margins of carapace. Intestinal region with one stria. Some scales and secondary striae between main striae. A row of 12 epigastric spines, one parahepatic, one hepatic and one postcervical spine on each side. Frontal margins nearly horizontal. Lateral margins feebly convex. First spine well developed, situated at anterolateral angle, not reaching level of sinus between rostrum and supraocular spines.Two small marginal spines in front of cervical groove one-third length of anterolateral one. Branchial margins with 5 small spines decreasing in size posteriorly.Rostrum spiniform, 0.6 times length of remaining carapace, slightly curved and horizontal. Supraocular spines short, not reaching mid length of rostrum, and clearly not reaching end of corneas, subparallel, directed upward ( Fig. 6A View FIG ).

Fourth thoracic sternite with a few small scales. Anterior part of fourth sternite narrower than third, slightly concave medially, contiguous to median posterior margin of third sternite.Transverse ridges between fifth, sixth and seventh sternites obtuse, feebly granulated ( Fig. 6B View FIG ).

Second and third abdominal somites each with four transverse ridges, anterior ridge of second somite with row of 9 spines.

Epistomic crest with hump near mouth.

Eyes moderately large, maximum corneal diameter nearly half distance between bases of anterolateral spines.

Basal segment of antennule (distal spines excluded), 0.3 carapace length, moderately elongate, slightly exceeding corneas, with 2 distal spines, mesial spine clearly shorter than lateral spine; 2 spines on lateral margin, proximal one short, located at mid length of segment, distal one long, nearly reaching end of distolateral spine ( Fig. 6C View FIG ); distance between distal end of article and base of dorsolateral spine 0.3 length of remaining proximal portion. First segment of antennal peduncle with distal spine on mesial margin, not reaching end of second segment; second segment with 2 distal spines, mesial spine clearly longer than lateral spine, overreaching end of antennal peduncle; third segment unarmed ( Fig. 6C View FIG ).

Mxp3 ischium nearly twice length of merus measured along extensor margin, distoventrally bearing spine. Merus bearing 2 spines on flexor margin, proximal spine prominent; extensor margin unarmed ( Fig. 6D View FIG ).

P1 squamate, 4.5 times carapace length, with numerous uniramous iridescent setae on mesial borders of articles. Merus longer than carapace, more than twice carpus length, armed with some spines, stronger spines on distal border, not reaching proximal fourth of carpus. Carpus 2.5 times longer than high, shorter than palm, with few spines on mesial, lateral and dorsal sides. Palm slightly longer than fingers, with row of spines along mesial and lateral borders, some small spines on dorsal side. Fingers distally curving and crossing, ending in a sharp point; fixed finger with some spines along entire border, 2 distal spines accommodating opposite spine of movable finger when closed; movable finger unarmed, except basal spine ( Fig. 6E View FIG ).

P2 twice carapace length; merus slightly shorter than carapace, about 7 times as long as high, 4 times carpus length and twice propodus length; propodus about 6 times as long as high, and 1.5 times longer than dactylus ( Fig. 6F View FIG ). Merus with row of some spines along extensor and flexor borders. Carpus with several spines and one distoventral spine; end of carpus nearly reaching mid length of merocarpal articulation of P1. Propodus with 11 movable spinules along flexor margin. Dactylus moderately long and slender, slightly curving distally, extensor margin slightly convex on proximal half, flexor margin with 7 movable spinules, unarmed on distal third. P3 similar in length and armature to P2; P3 merus shorter than P2 merus, and P3 propodus slightly longer than P2 propodus ( Fig. 6H View FIG ). P4 shorter than P2 and P3; P4 merus about 0.6 times P2 merus length; merocarpal articulation reaching level of anterior end of cervical groove.

REMARKS

The new species resembles M. mendagnai Cabezas, Macpherson & Machordom, 2009 from Solomon Islands, in having five spines on the lateral margin of the carapace behind cervical groove, eyes large, the second abdominal segment with spines and some uninterrupted transverse striae, the lateral parts of the posterior thoracic sternites without granules, the rostrum spiniform, the distomesial spine of basal antennular segment clearly shorter than the distolateral, and the distal half of the flexor border of the P2-P4 dactyli unarmed. These species can be easily distinguished by the following characters:

– the distomesial spine of the second antennal segment clearly exceeds the antennal peduncle in the new species and reaches or slightly exceeds the distal margin of the third segment in M. mendagnai ;

– the P1 is more elongate in the new species, having the merus clearly longer than the carapace, and the carpus 2.5 times longer than broad, whereas the merus is shorter than the carapace and the carpus is 1.4-1.7 times as long as broad in M. mendagnai .