Coral reef-associated brachyuran fauna (Crustacea: Decapoda: Brachyura) from Angria Bank off the west coast of India Author Padate, Vinay P. 0000-0002-2244-8338 Centre for Marine Living Resources & Ecology, Ministry of Earth Sciences, Government of India, Atal Bhavan, LNG Terminus Road, Puthuvype, Kochi, 682508, India. & vinaypadate @ gmail. com; https: // orcid. org / 0000 - 0002 - 2244 - 8338 vinaypadate@gmail.com Author Periasamy, Rengaiyan 0000-0001-6941-4074 CSIR - National Institute of Oceanography, Dona Paula, Goa, 403004, India. & periasamy @ ncpor. res. in; https: // orcid. org / 0000 - 0001 - 6941 - 4074 periasamy@ncpor.res.in Author Rivonker, Chandrashekher U. 0000-0002-5828-5032 School of Earth, Ocean and Atmospheric Sciences, Goa University, Goa, 403206, India. & curivonker @ unigoa. ac. in; https: // orcid. org / 0000 - 0002 - 5828 - 5032 curivonker@unigoa.ac.in Author Ingole, Baban S. 0000-0001-6096-6980 CSIR - National Institute of Oceanography, Dona Paula, Goa, 403004, India. & babaningole @ ncpor. res. in; https: // orcid. org / 0000 - 0001 - 6096 - 6980 & National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Government of India, Headland Sada, Vasco-Da-Gama, Goa, 403804, India. babaningole@ncpor.res.in text Zootaxa 2023 2023-10-19 5357 3 398 422 http://dx.doi.org/10.11646/zootaxa.5357.3.4 journal article 274290 10.11646/zootaxa.5357.3.4 44033c16-d494-439a-b750-71b16fb90247 1175-5326 10063288 75944208-37BF-484C-9917-F9376027C31E Portunus convexus De Haan, 1835 ( Fig. 3H ) Portunus (Pontus) convexus De Haan, 1833: 9 ( type locality: Japan ). Portunus (Pontus) Convexus . — Herklots 1861: 118 . Neptunus sieboldi A. Milne-Edwards, 1861: 323 , pl. XXXV fig. 5.— Henderson 1893: 370 . Neptunus convexus .—de Man 1883: 150 .— Nobili 1901: 9 .—de Man 1902: 643 , pl. 21 figs. 27 a–b.— Nobili 1906a: 193–194 . Portunus convexus .— Crosnier 1962 .—47, figs. 60, 64–66, 69–70, pl. 2, fig. 2.— Guinot 1962b: 10 .— Stephenson 1972b: 13 , 15 (identification key), 38.— Stephenson 1976: 16 .— Vannini 1976: 122 , 126 .— Hogarth 1989: 104 (list).— Holthuis 1993: 614, Fig. 7 .— Fransen et al. 1997: 108 .— Apel & Spiridonov 1998: 284 , figs. 96, 108.— Vannini & Innocenti 2000: 262 , figs. 19, 24, 77 . Material examined. 1 juvenile (damaged specimen, not measured), ( NIO /BOD/AB/BRY/00009), RVSS 9 , west of Vijaydurg , Arabian Sea , 16.57°N , 72.10°E , 27 m depth , Van Veen grab, coll. R . Periasamy , 7 January 2014 . Diagnosis. Carapace broader than long, frontal margin divided into 6 teeth (including inner supra-orbital angles); anterolateral margins divided into 9 acuminate teeth, ninth tooth longest and laterally directed; posterolateral junction rounded ( Fig. 5H ). Cheliped merus with 3 spines on anterior margin, dactylus as long as propodus ( Fig. 5H ). Colouration. Fresh specimen: carapace frontal and orbital margins as well as first 4 antero-lateral teeth white, rest of the carapace brownish yellow, 2 pale spots outlined in brown on the postero-lateral portion ( Fig. 3H ). Biology. Known to be an inhabitant of sandy substrata, rock pools, crevices ( Vannini & Innocenti 2000 ) and intertidal sea grass beds ( Crosnier 1962 ); 20–27 m ( Stephenson 1976 ; present study). The present specimen was collected from rocky substratum, at 27 m depth, covered with macroalgae. Remarks. De Haan (1833) described Portunus convexus from Japan . Crosnier (1962) provided an illustrated description of this species from Madagascar . Apel & Spiridonov (1998) provided an illustrated description of material from Arabian Gulf supplemented with notes on habitat and geographical distribution. Vannini & Innocenti (2000) provided a brief illustrated description of Somalian specimens. The present specimen conforms to the description of the carapace being less than twice as wide as long by Crosnier (1962) , and that of the live colouration ( Stephenson 1972b ) in the presence of a pale subcircular spot outlined with brown near each posterolateral margins of carapace. Contrary to Vannini & Innocenti’s (2000) observation that this species does not occur in reefs, the present specimens were collected from a coral reef habitat. Geographical distribution. East coast of Africa, Madagascar , Mascarenes, Persian Gulf, Sri Lanka , Indonesia , Japan ( Vannini & Innocenti 2000 ), Guam ( Paulay et al. 2003 ), French Polynesia ( Poupin et al. 2018 ); eastern Arabian Sea off India (present study). The present observation is the first record from Indian waters.