Crocydocinus brevirostris ( Doflein, 1904 ) Lee & Forges & Ng, 2019

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), Zootaxa 4619 (1), pp. 1-44 : 28-29

Crocydocinus brevirostris ( Doflein, 1904) comb. nov.

( Figs. 13B , 15B , 17B )

Hyastenus brevirostris Doflein, 1904: 85 , 86, pl. 27 fig. 13, 14 (type locality: between Benkulen and Padang, southwest coast of Sumatra).

Pugettia brevirostris— Gordon 1931: 557, 558, fig. 36a, b (not Pugettia brevirostris Parisi, 1915 = P. sagamiensis Gordon, 1931 ).

Rochinia brevirostris— Griffin & Tranter 1986: 176 (key), 176–178, figs. 57c, d, 62c, d.– Tavares, 1991: 161 (list).— Casadío et al. 2005: 158 (list).— Takeda & Komatsu 2005: 280. – Ng & Richer de Forges 2007: 62 (list).— Ng et al. 2008: 105 (key).— Ng & Richer de Forges 2013: 362, fig. 5C.

Tunepugettia brevirostris — Ng et al. 2017: 147 (list), 148, fig. 8.

Material examined. Holotype: female (22.4 × 15.5 mm) ( ZMB 13647), stn 185, Sumatra, 614 m, coll. Deutsche Tiefsee Expedition, 21 January 1899.

Diagnosis. Carapace pyriform; covered with dense layer of setae ( Fig. 13B ). Pseudorostral spines short, diverging in V. Supraorbital eave fused with carapace; pre-orbital; postorbital lobe cup-like. Carapace with regions well-defined; hepatic lobe directed outwards; gastric region swollen, 1 mesogastric granule medially, 1 metagastric granule; 1 urogastric granule; cardiac region swollen, with large granule; lateral branchial lobe directed outwards; epibranchial region swollen, form large granule; posterior region of carapace with intestinal granule medially ( Fig. 13B ). Basal antennal article slightly longer than broad, margin rounded. Buccal frame covered by third maxiliped; distal angle slightly protruded. Pterygostomial region with 3 granules on outer margin ( Fig. 15B ). Chelipeds slender, covered with setae; propodus longer than fingers, margins carinate; merus triangular in cross-section, margins carinate. Ambulatory legs covered in setae, lateral margins with long setae, smooth when denuded. Adult female pleon rounded with all somites free ( Fig. 15B ).

Remarks. Little is known of Crocydocinus brevirostris comb. nov. Takeda & Komatsu (2005) indicated that C. brevirostris comb. nov. should be transferred to Goniopugettia Sakai, 1986 . Subsequently, it was briefly mentioned by Takeda & Marumura (2014) but its taxonomy was not discussed. Ng et al. (2017) revised Goniopugettia Sakai, 1986 , recognising only one species, G. tanakae Sakai, 1986 , in the genus. A new genus, Tunepugettia Ng, Komai & Sato (2017) , was established for T. sagamiensis ( Gordon, 1930) and T. brevirostris ( Doflein, 1904) , the latter with doubt. However, based on the examination of the type specimen, we now know this species is morphologically closer to species of Crocydocinus n. gen.

The specimen studied by Griffin & Tranter (1986), from the Zoological Survey of India, Calcutta, was not examined so we are unable to ascertain if the specimen is indeed C. brevirostris comb. nov. However, based on the description provided by Griffin & Tranter (1986: 176–178), there appear to be some slight differences between that specimen and the holotype female, notably in the more rounded pre-orbital lobe that is broader than the laterally flattened post-orbital lobe. As mentioned by Griffin & Tranter (1986: 176–178), C. brevirostris comb. nov. is most similar to T. sagamiensis and C. beauchampi comb. nov. but differs from T. sagamiensis in having the postorbital lobe and hepatic lobe not fused (versus the postorbital lobe and hepatic lobe fused on T. sagamiensis ), and differs from C. beauchampi comb. nov. in having the branchial regions less swollen and not adjacent to the median line (versus having the branchial regions more swollen and adjacent to the median line on C. beauchampi comb. nov.).

Crocydocinus brevirostris comb. nov. is found in the eastern Indian Ocean: Bay of Bengal and southwest coast of Sumatra (Griffin & Tranter 1986).

Figures

FIGURE 13. Overall dorsal view. A, Crocydocinus ewok n. sp., holotype, male (22.5 × 15.0 mm) (MNHN-IU-2011-2328), Papua New Guinea; B, C. brevirostris (Doflein, 1904) comb. nov., holotype, female (22.4 × 15.5 mm) (ZMB 13647), Sumatra; C, C. crosnieri (Griffin & Tranter, 1986) comb. nov., holotype, female (20.1 × 13.9 mm) (MNHN-B16073), Réunion; D, C. decipata (Williams & Eldredge, 1994) comb. nov., holotype, male (14.2 × 9.1 mm) (USNM251434), Guam.

FIGURE 15. Overall ventral view. A, Crocydocinus ewok n. sp., holotype, male (22.5 × 15.0 mm) (MNHN-IU-2011-2328), Papua New Guinea; B, C. brevirostris (Doflein, 1904) comb. nov., holotype, female (22.4 × 15.5 mm) (ZMB 13647), Sumatra; C, C. crosnieri (Griffin & Tranter, 1986) comb. nov., holotype, female (20.1 × 13.9 mm) (MNHN-B16073), Réunion; D, C. decipata (Williams & Eldredge, 1994) comb. nov., holotype, male (14.2 × 9.1 mm) (USNM251434), Guam.

FIGURE 17. Lateral view of carapace.A, Crocydocinus ewok n. sp., holotype, male (22.5 × 15.0 mm) (MNHN-IU-2011-2328), Papua New Guinea; B, C. brevirostris (Doflein, 1904) comb. nov., holotype, female (22.4 × 15.5 mm) (ZMB 13647), Sumatra; C, C. crosnieri (Griffin & Tranter, 1986) comb. nov., holotype, female (20.1 × 13.9 mm) (MNHN-B16073), Ile de la Réunion; D, C. decipata (Williams & Eldredge, 1994) comb. nov., holotype, male (14.2 × 9.1 mm) (USNM251434), Guam; E, C. panglao n. sp., holotype, ovigerous female (32.4 × 22.6 mm) (NMCR 50091), Philippines; F, C. porg n. sp., holotype, female (28.5 × 19.3 mm) (MNHN-IU-2013-3042), Papua New Guinea; G, C. vanuatu n. sp., holotype, male (16.0 × 11.0 mm) (ZRC 2011.1047), Vanuatu.