Deep-sea spider crabs of the family Epialtidae MacLeay, 1838, from Papua New Guinea, with a redefinition of Tunepugettia Ng, Komai & Sato, 2017, and descriptions of two new genera (Crustacea: Decapoda: Brachyura: Majoidea) Author Lee, Bee Yan Author Forges, Bertrand Richer De Author Ng, Peter K. L. text Zootaxa 2019 2019-06-18 4619 1 1 44 journal article 26462 10.11646/zootaxa.4619.1.1 9aaf6711-748d-4067-a759-26d37802b7fc 1175-5326 3248363 CA6AEB18-2F97-449C-AE34-E1509DFFC841 Oxypleurodon papuense n. sp. ( Figs. 1D , 3 A–C, 5E–H) Material examined. Holotype : male (18.3 × 12.6 mm ) (MNHN-IU-2015-228) [photographed], stn DW4286, north of Laughlan Islands , Solomon sea, 09°12’S 153°55’E , 306–365 m , coll. MADEEP Expedition, 30 April 2014 . Diagnosis. Relatively large species (carapace length 18.3 mm ). Carapace pyriform. Pseudorostral spines short, slightly curved, strongly diverging to form prominent V-shape. Carapace with several raised plates; 2 elongate supraorbital plates; postorbital plate fused with hepatic plate forming L-shape plate; gastric region with 3 granules above 1 rounded mesogastric plate; 2 epibranchial plates; 2 elongate plates on each side of carapace; 1 large rounded cardiac plate; posterior region of carapace with raised thick plate, with blunt posterior tooth medially ( Figs. 1D , 3A ). Antennal flagellum slightly longer than or equal in length to pseudorostral spines. Basal antennal article longer than broad, narrow, fused with carapace; distal angle blunt. Buccal frame covered by third maxilliped. Pterygostomial region with 1 raised plate on outer margin ( Fig. 3B ). Chelipeds stout, slightly shorter than P2; propodus slightly inflated, nearly equal in length to fingers; carpus with carinate on both margin; merus triangular in cross-section. Ambulatory legs slender; P2 longest. Male thoracic sternum depressed anteriorly; sternites 3 and 4 narrow, constricted anteriorly, widest at base. Male pleon triangular, with telson and 6 somites all free. G1 straight, slightly constricted near distal third, distal tip sharp ( Fig. 5 E–H). Coloration. Coloration of live specimen is whitish with the anterior part of the carapace and the chelae pink ( Fig. 1D ). Etymology. The name of this species is named after the country, Papua New Guinea , where it was collected. Remarks . At approximately 18 mm in carapace length, Oxypleurodon papuense n. sp. is relatively large for members of this genus. The comparable species are O . forte Lee, Corbari & Richer de Forges, 2015 , from the South China Sea, O . karubar Richer de Forges, 1995 , from Indonesia , O . luzonicum ( Rathbun, 1916 ) , and O . sanctaeclausi Richer de Forges & Ng, 2009 , from the Philippines , and O . wilsoni Richer de Forges & Poore, 2008 , from Western Australia (cf. Richer de Forges 1995 : figs. 2, pl. 2 A, C; Richer de Forges & Poore 2008 : fig. 1b; Richer de Forges & Ng 2009a : figs. 1A, 11A; Lee et al . 2015 : figs. 2A, 3A). All these species have a round cardiac plate, large epibranchial plates, and there are three gastric granules. These species, however, have sharp branchial plates directed outwards (cf. Richer de Forges 1995 : figs. 2, pl. 2 A, C; Richer de Forges & Poore 2008 : fig. 1b; Richer de Forges & Ng 2009a : figs. 1A, 11A; Lee et al . 2015 : figs. 2A, 3A). Oxypleurodon papuense n. sp. , however, only has a rounded branchial plate ( Figs. 1D , 3A ). Oxypleurodon papuense n. sp. is currently only known from its type locality, Papua New Guinea .