Discoplax longipes A. Milne-Edwards, 1867

Ng, Ngan Kee, Rodríguez Moreno, Paula A., Naruse, Tohru, Guinot, Danièle & Mollaret, Noémy, 2019, Annotated type-catalogue of Brachyura (Crustacea, Decapoda) of the Muséum national d’Histoire naturelle, Paris. Part II. Gecarcinidae and Grapsidae (Thoracotremata, Grapsoidea), with an Appendix of pre- 1900 collectors, Zoosystema 41 (7), pp. 91-130 : 98

Discoplax longipes A. Milne-Edwards, 1867

( Fig. 2C )

Discoplax longipes A. Milne-Edwards, 1867: 284 ; 1873a: 294, pl. 15.

CURRENT TAXONOMIC STATUS. — Discoplax longipes A. Milne-Edwards, 1867 (see Ng & Guinot 2001: 317; Guinot et al. 2018: 563).

LECTOTYPE (by inference of holotype by Türkay 1974c: 259, as Cardisoma longipes ; Ng & Guinot 2001: 317). — MNHN-IU-2000-3763 (= MNHN-B3763), ♂ 54.0 × 55.0 mm, New Caledonia; presumed type, D. Guinot 1972; Discoplax longipes A. Edw., B 3763, det. Guinot & Ng 2001. — Original label: “ Cardisoma longipes, A. M. Edw. (= Discoplax longipes A. Edw. ), Nouvelle-Calédonie”. Additional labels: “ Cardisoma longipes A. M. Edw. (= Discoplax longipes A. M. Edw. ). Nelle Calédonie”. “Type présumé, D. Guinot 1972”. “ Cardisoma longipes (A. Milne-Edwards 1873) , Révision M. Türkay VI.1972 ”; “ Discoplax longipes A. Edw., B 3763, det. Guinot et Ng 2001 ”.

PRESERVATION. — Dry. LP3, RP3 dactyli missing.

REMARKS

This specimen, the only one under this name in the MNHN collections, was regarded as the holotype by Türkay (1974c: 259, as Cardisoma longipes , with measurements 54.0 × 49 mm); on account of the measurements similar to those noted by A. Milne-Edwards (1867), it was considered the holotype by monotypy by Ng & Guinot (2001: 317, with measurements 54.0 by 55.0 mm) and also by Ng & Shih (2015: 383, but with measurements 54.6 × 48.5 mm). In the absence of mention of several specimens in the original description, it is considered the lectotype. Ng & Shih (2015: figs 1A-D, 11C, D) reproduced the figures of A. Milne-Edwards (1873a: pl. 15) and figured the gonopods of this specimen.

Alphonse Milne-Edwards (1873a: 294) regarded Discoplax longipes as “very rare” in New Caledonia. The specimen was simply labelled as from “ New Caledonia ”, without any other indication as is often the case in old descriptions and records, but the presence of the species on the main island of New Caledonia is doubtful. It seems that, since A. Milne-Edwards (1867), no specimens of D. longipes have been collected from the main Island where the species is not known locally ( Ng & Guinot 2001). The specimen on which A. Milne-Edwards (1867) based his description, i.e., the present lectotype, may have actually been collected from the nearby Loyalty Islands where D. longipes is not uncommon (see Ng & Shih 2014).

Figures

FIG. 2. — A, Cardisoma urvillei H. Milne Edwards, 1853, MNHN-IU-2000-3735 (= MNHN-B3735),lectotype, ♂; B, Discoplax gracilipes Ng & Guinot, 2001, MNHN- IU-2014-11214 (= MNHN-B26950),paratype,♀; C, Discoplax longipes A.Milne-Edwards,1867,MNHN-IU-2000-3763 (= MNHN-B3763),lectotype,♂; D, Gecarcinus digueti Bouvier,1895,MNHN-IU-2000-10951 (= MNHN-B10951),holotype,♂; E, Gecarcinus lagostoma H. Milne Edwards,1837,MNHN-IU-2000-3750 (= MNHN- B3750), lectotype, ♂; F, Gecarcinus lateralis Fréminville in Guérin-Méneville, 1832, MNHN-IU-2000-3758 (= MNHN-B3758), neotype, ♂; G, Gecarcinus nobilii Perger & Wall, 2014, MNHN-IU-2014-11211 (= MNHN-B12314), paratype, ♀; H, Pelocarcinus cailloti A. Milne-Edwards, 1890, MNHN-IU-2000-3751 (= MNHN- B3751), holotype, ♂. Scale bars: A, E, 5 cm; B-D, F-H, 2 cm.