Micas filholi (De Man, 1888) De Man, 1888

Poore, Gary C. B., Guinot, Danièle, Komai, Tomoyuki & Naruse, Tohru, 2016, Reappraisal of species attributed to Halicarcinus White, 1846 (Crustacea: Decapoda: Brachyura: Hymenosomatidae) with diagnosis of four new genera and one new species from New Ireland, Papua New Guinea, Zootaxa 4093 (4), pp. 480-514 : 494

Micas filholi (De Man, 1888) n. comb.

( Fig. 4 )

Elamene [sic] filholi De Man, 1888: 386 –388, pl. 17 fig 3. — Lucas 1980: 178. Neorhynchoplax filholi— Sakai 1938: 200.

Halicarcinus filholi— Ng & Chuang 1996: 48–50, fig. 19.

Material examined. Holotype. Indonesia. Sumatra, E Lampong, Insel Nordwachter (= Pulau Sebiri), SMF ZMG 805 (male, 4.0 mm).

Distribution. Indonesia, Pulau Sebiri (between N of Java and E of Sumatra).

Remarks. Lucas (1980) noted that Elamena filholi may belong to Halicarcinus but did not include it in his key. Ng & Chuang (1996) provisionally transferred it to Halicarcinus . A re-examination of the holotype by TN revealed that it is morphologically similar to Micas minutus (A. Milne-Edwards, 1873) in having a very thin hymenosomian rim that separates the rostrum from the carapace, very long ambulatory dactyli, and a slender and twice-twisted gonopod 1 ( Fig. 4 e). However, Elamena filholi differs from M. minutus in the shape of ambulatory dactyli and the number of their subdistal teeth (dactylus gently curved inwards, with one subterminal tooth vs dactylus strongly curved inwards, with two subdistal teeth), the fusion of male pleonal somites (3–5 or 3– pleotelson functionally fused vs 3–4 fused), and the shape of gonopod 1 (proportionally stouter, with strongly bent apex vs more slender, with apex gently directed anteromesially). Elamena filholi is here transferred to Micas .

Figures

FIGURE 4. Micas filholi (De Man, 1888). Holotype of Elamena filholi De Man, 1888, male, cl 4.0 mm, SMF ZMG 805: a, carapace and right pereopods; b, rostrum and anterior carapace; c, right pereopod 3, dactylus; d, pleon; e, gonopod 1. Scale bars a – d = 1 mm, e = 0.5 mm.