New species of deep-water galatheoid crab from India

Phylum: Arthropoda

Class: Malacostraca Latreille, 1802

Order: Decapoda Latreille, 1802

Family: Munididae Ahyong, Baba, Macpherson & Poore, 2010

Trapezionida bharuchai Tiwari, Padate & Cubelio, 2023

Collection: Andaman Sea, east off Little Andaman Island – 10.72°N, 92.70°E, 53 m, 10.08.2019 (FORVSS 388 St. 06), Chain dredge. Andaman Sea, east of Great Nicobar Island – 6.64°N, 93.82°E, 56 m, 16.08.2019 (FORVSS 388 St. 18), Chain dredge. Bay of Bengal, west off Car Nicobar Island – 9.28°N, 92.70°E, 50 m, 06.12.2011 (FORVSS 292 leg II St. 60), Smith-McIntyre grab. Bay of Bengal, west off Great Nicobar Island – 7.13°N, 93.54°E, 50 m, 11.12.2011 (292 leg II St. 86), Smith-McIntyre grab.

Voucher No.: CMLRE IO/SS/ANO/00130, IO/SS/ANO/00131, IO/SS/ANO/00132, IO/SS/ANO/00154, IO/SS/ANO/00155 and IO/SS/ANO/00156.

Description: Small galatheoid crab possessing carapace with 5 pairs of epigastric spines and 1 median spine; hepatic region with 1 or 2 spines; parahepatic, anterobranchial, postcervical regions each with 1 small spine; anterolateral spine not reaching sinus between rostrum and supraocular spines; branchial margins with 5 spines; posterior margin unarmed. Thoracic sternite 4 with 1 pair of long oblique submedian striae and 1 pair of short submedian striae at midlength, anterior margin widely contiguous to sternite 3. Pleonal tergites 2 and 3 with 1 uninterrupted transverse ridge anterior and posterior to median groove, tergite 4 with 1 interrupted anterior ridge. Antennular peduncle article 1 bearing subequal distal spines, first lateral spine overreaching distal spines. Distomesial spine of antennal article 1 reaching distal margin of article 2; distomesial spine of article 2 not reaching distal margin of article 4, mesial margin with short spine, distolateral spine not reaching distal margin of article 3. Mxp3 merus with 3 flexor spines, disto-extensor spine present. P1 fingers 0.7 times palm length, fixed finger with 5 spines on dorsolateral surface, 2 subdistal spines on lateral margin, dactylus with short proximal spine, 2 spines on mesial margin and 2 subdistal spines. P2–4 dactyli with flexor margins bearing 7 movable spines, distal tips corneous, with slender subterminal spine closely appressed to unguis.

Biological association: None.

Remarks: New species of the genus Trapezionida Macpherson and Baba, 2022 from Indian EEZ.

Distribution: Andaman Sea and southeastern Bay of Bengal. Depth range: 50–56 m.

Distribution map:

Identified by: Shivam Tiwari

Publication: Tiwari S., Padate V.P., Cubelio S.S. (2023) Chirostyloid and galatheoid squat lobsters (Decapoda: Anomura) from Andaman and Nicobar Islands, India, with three new species. Journal of Natural History, 57 (9–12): 520–556.

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