Crocydocinus crosnieri Lee & Forges & Ng 2019, comb. nov.
Creators: name: Lee, Bee Yan
name: Forges, Bertrand Richer De
name: Ng, Peter K. L.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Epialtidae
Crocydocinus
Crocydocinus crosnieri

description: Crocydocinus crosnieri (Griffin & Tranter, 1986) comb. nov.
(Figs. 13C, 15C, 17C, 18 G–J)
Hyastenus sp.— Crosnier 1976: 242, pl. 2.
Rochinia crosnieri Griffin & Tranter, 1986: 176 (key), 179, fig. 57a, b (type locality: Réunion, St. Paul).
Rochinia crosnieri— Tavares, 1991: 161 (list).— Casadío et al. 2005: 159 (list). – Ng & Richer de Forges 2007: 62 (list).— Ng et al. 2008: 105 (list).
Material examined. Holotype: female (20.1 × 13.9 mm) (MNHN-IU-2014-19835 [MNHN-B16073]), Réunion Island, St. Paul, 580–680 m, coll. P. Guézé, March 1973. Others: Réunion: 1 ovigerous female (24.7 × 16.8 mm) (MNHN-IU-2016-9523), Réunion Island, Casiers, 350–500 m, coll. 2 February 1974. Seychelles: 2 males (30.3 × 21.7 mm, 28.1 × 20.9 mm), 1 ovigerous female (24.4 × 17.1 mm), 1 female (with Sacculina; 25.0 × 18.2 mm) (MNHN-IU-2016-9524), stn 4.22, Seychelles Islands, Pêches au Casier, 04°46.5’S 56°38.4’E, 420–430 m, coll. 23 October 1987.
Diagnosis. Carapace pyriform, covered with layer of setae and long tufts of setae on pseudorostral spines, edge of gastric region and lateral margin of carapace. Pseudorostral spines straight, diverging in V. Supraorbital eave fused with carapace; pre-orbital angle forms sharp spine; postorbital lobe slender. Carapace with regions defined; epibranchial region slightly swollen (Fig. 13C). Antennal flagellum longer than pseudorostral spines. Basal antennal article longer than broad, distal angel rounded, margin slightly constricted. Buccal frame covered by third maxilliped, distal angle of frame slightly protruded. Pterygostomial region with 3 granules on outer margin (Fig. 15C). Chelipeds slender, covered with setae except on fingers.Ambulatory legs slender, covered with layer of setae except on dactylus. Adult female pleon rounded covered with thick layer of setae, with all somites and telson free (Fig. 15C). G1 straight, distal tip sharp, slight constriction near distal region (Fig. 18 G–I).
Remarks. Three female specimens were examined and identified by Crosnier (1976) as Hyastenus sp., and compared with Rochinia brevirostris. Griffin & Tranter (1986) examined one of these female specimens and designated it as the holotype of Rochinia crosnieri Griffin & Tranter, 1986.
Crocydocinus crosnieri comb. nov. has all the other morphological characteristics of Crocydocinus n. gen.: smooth and cylindrical pseudorostral spines (Fig. 13C), straight with slightly constricted outer margin of the basal antennal article (Fig. 15C), and the absence of carina on the ambulatory legs (Fig. 13C). As such, it is here transferred to Crocydocinus n. gen. Carapace with regions well defined and no distinct strong large granules on C. crosnieri comb. nov. (Fig. 13C) (versus carapace with regions well defined with strong large granules on the other species in the genus; Fig. 13A, B, D, 14); lack of lateral branchial spines on the carapace, similar to C. decipata (Fig. 13D) (versus presence of weak or distinct lateral branchial spines on the other species in the genus; Fig. 13A, B, 14); and the hepatic spine not swollen basally (Fig. 17C) (versus hepatic spine swollen basally on other species in the genus; Fig. 17A, B, D–G).
Crocydocinus crosnieri comb. nov. is known from its type locality, Réunion Island, St. Paul (Griffin & Tranter 1986), and Seychelles (this study).
description: Published as part of Lee, Bee Yan, Forges, Bertrand Richer De & Ng, Peter K. L., 2019, 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), pp. 1-44 in Zootaxa 4619 (1) on page 29, DOI: 10.11646/zootaxa.4619.1.1, http://zenodo.org/record/3248363