Glabropilumnus levimanus ( Dana, 1852 )

Fahimi, Neda & Naderloo, Reza, 2023, Pilumnidae Samouelle, 1819 (Crustacea: Decapoda: Brachyura: Pilumnidae) of the Persian Gulf and Gulf of Oman, with a note on their phylogeny, Zootaxa 5264 (2), pp. 256-274 : 260-262

Glabropilumnus levimanus ( Dana, 1852)

( Fig. 2 )

Pilumnus levimanus Dana, 1852: 237 ; 1855: pl. 13, fig. 11a.—A. Milne-Edwards 1873: 250, pl. 10, fig. 4.— De Man 1888: 301.— Lenz 1905: 356.—Nobili 1906: 279.

Pilumnus edamensis De Man, 1888: 302 , pl. 11, fig. 5.

Glabropilumnus edamensis .— Balss 1932: 516 (list); 1933: 39 (list).

Glabropilumnus laevimanus .— Balss 1938: 61.—Guinot 1962a: 273 (list); 1962b: 2, fig. 1.— Galil & Takeda 1988: 74, figs. 3C, 4.

Material examined. 1 male, CL 5.40 mm, CW 7.33 mm, 1 female, CL 6.12 mm, CW 9.23 mm ( ZUTC 5768 ), Ghadir Park , Abu-Musa I., Persian Gulf, 25°53′N, 55°01′E, rocky/coral, coll. H. Ashrafi and R. Abdollahi, 4.06.2019 ; 1 male, CL 4.30 mm, CW 7.23 mm ( ZUTC 5769 ), Tang , Sistan-Baluchestan, Gulf of Oman, 25°43′N, 61°01′E, sandy bed with boulders, coll. M. Qorbani 10.03.2019 .

Diagnosis. Carapace wider than long, transversely oval ( Fig 2A ); dorsal surface smooth; transverse row of setae on hepatic region, additional setae on epibranchial regions; front bilobed, frontal lobes distinctly granulate, row of simple and plumose setae across of front; supraorbital margin distinctly granulate Anterolateral margins with three spinose teeth, nearly in equal size ( Fig. 2A ); margin between postorbital angle and anterior tooth granulate, dipping imperceptibly to superior orbital angle. Anterior margin of first maxilliped endopod concave. Third maxillipeds completely covering buccal cavern when closed; exopod stout, inner margin moderately denticulate. Both adult male and female chelipeds unequal ( Fig. 2E ); ischium short, anterior margin bearing four denticles, distalmost largest; inner surface of merus smooth, anterior margin with three teeth, dorsal margin serrate ( Fig. 2E ); carpus with outer surface coated by stiff and some plumose setae ( Fig. 2F ), anterior margin granular with one clear spinose tooth, row of granules, acute and minute spines on dorsal to outer (lateral) surface ( Fig. 2F ). Manus of right chela smooth, glabrous ( Fig. 2F ). External surface of manus of left chela entirely densely setose, tuberculate, with short plumose setae; dactylus curved, with distinct teeth on occlusal margin ( Fig. 2F ). Ambulatory legs (P2–5) with ischium smooth, with few long setae; merus longest, nearly completely covered by setae; carpus and propodus with dense long and short setae, dactylus almost slender with setae ( Fig. 2G ). Thoracic sternites smooth; sternites 3 and 4 completely fused. Pleon with 6 somites and telson freely articulating.

Distribution. Indo-West Pacific: Persian Gulf, Gulf of Oman, Red Sea, Singapore, Mali Peninsula, Siam Bay, South China Sea, Hong Kong, Pulo, New Caledonia.

Remarks. Glabropilumnus levimanus was described by Dana (1852:237) and A. Milne-Edwards (1873: 250) added further diagnostic characteristics, such as the anterolateral carapace margins being granulated and presence of rounded granules on the upper surface of larger chela. Galil & Takeda (1988) revised and improved the taxonomy of Glabropilumnus and synonymized G. levimanus and G. edamensis .

Our specimens correspond to G. levimanus , according to Dana (1852) and Galil & Takeda (1988). For elucidating the identity of the species, we provide more detailed drawings of the carapace, chela, and frontal region. Regarding the chela granulations, characteristics of anterolateral margins of carapace and presence of setal row on hepatic region, the present specimens completely agree with G. levimanus .

Figures

FIGURE 2. Glabropilumnus levimanus, male CL 4.30 mm, CW 7.23 mm (ZUTC 5769). (A) carapace; (B) abdomen; (C) palm of right cheliped (outer face); (D) palm of left cheliped (outer face); (E) merus of right cheliped (outer face); (F) Carpus of left cheliped (inner face); (G) fourth walking leg; (H) third maxillipeds