Podophthalminae Dana, 1851

Huang, Yu-Hsuan & Shih, Hsi-Te, 2021, Chthonius rhodochelatus Hadzi 1933, Zoological Studies 60 (60), pp. 1-45 : 16

Subfamily Podophthalminae Dana, 1851 Genus Podophthalmus Lamarck, 1801 Podophthalmus minabensis Sakai, 1961 ( Figs. 3E , 9 )

Podophthalmus minabensis Sakai, 1961: 144 , fig. 2e, pl. 4(1) (type locality: Minabe, Japan); Sakai 1965b: 41, fig. 1 ( Japan: Minabe); Bruce 1965: 287, fig. 1 ( Malaysia: Sarawak); Sakai 1976: 384, fig. 207, pl. 135(1) ( Japan: Minabe); Ng et al. 2008: 149 (list); Sasaki 2019: 9321 (list).

Vojmirophthalmus minabensis – Števčić 2011: 138 (list); Yosuva et al. 2020: 535, figs. 1, 2 ( India: Chennai).

Material examined: Taiwan: 1 male (25.2 × 14.9 mm) (NCHUZOOL 16499), Dalinpu, Siaogang, Kaohsiung, Jun. 2001.

Diagnosis: Carapace trapezoidal, 1.7 times broader than long. Frontal, protogastric and metagastric ridges absent; mesogastric, epibranchial and mesobranchial regions each with a pair of ridges; cardiac ridge unbroken ( Fig. 9A ). Front T-shaped, broader anteriorly, narrower between eyestalks ( Fig. 9A ). Supraorbital margins wide and denticulated ( Fig. 9A ). Eyestalks stout and long, with 2 plate-like expansions near cornea ( Figs. 3E , 9A ). Anterolateral margins with 2 teeth, first larger than second ( Fig. 9A ). Chelipedal merus with 2 spines on inner margin, 2 spines on outer margin; carpus with spine each on inner and outer margins; palm with tuberculous ridge on dorsal surface, outer surface with 3 ridges, inner surface with 1 ridge, ventral surface granulated; dactylus with outer margin denticulated. P5 with merus having a spine on inner margin; propodus with inner margin smooth. Male pleon with pleomere 6 trapezoidal, slightly longer than board. G1 with distal half slender, slightly bent laterally, tip with tubercles ( Fig. 9B–E ).

Coloration in life. Carapace and chelipeds yellowish brown with reddish-brown marking; P2– P5 pale yellowish brown, with propodus and dactylus bluish grey ( Yosuva et al. 2020).

Distribution: Taiwan (Siaogang, Kaohsiung; Fig. 1 : no. 8); Japan (incl. Ryukyus); Malaysia (Borneo: Sarawak); India (Chennai) ( Sasaki 2019; Yosuva et al. 2020; this study).

Ecological notes: A specimen was collected by trawling at around 30 meters deep (this study).

Remarks: The specimen from Taiwan is consistent with Podophthalmus minabensis by the following characters: (1) carapace trapezoidal ( Fig. 9A ; Sakai 1961: pl. 4(1)); (2) eyestalks with 2 plate-like expansions near cornea ( Fig. 9A ; Sakai 1961: pl. 4(1); Sakai 1965b: fig. 1a); (3) chelipeds with dactylus denticulated on outer margin ( Fig. 3E ; Sakai 1965b: fig. 1b).

Figures

Fig. 3. Species of the family Portunidae. A, Carupa ohashii Takeda, 1993, female (34.9 × 23.1 mm) (NCHUZOOL 16500), Dongsha I.; B, Lupocycloporus minutus (Shen, 1937), male (17.5 × 9.7 mm) (NCHUZOOL 16534), Zuoying, Kaohsiung; C, Lupocyclus inaequalis (Walker, 1887), male (21.6 × 16.3 mm) (NCHUZOOL 16551), Erzihliao Fishing Port, Kaohsiung; D, Lupocyclus tugelae Barnard, 1950, male (17.5 × 13.1 mm) (NCHUZOOL 16560), Erzihliao Fishing Port, Kaohsiung; E, Podophthalmus minabensis Sakai, 1961, male (25.2 × 14.9 mm) (NCHUZOOL 16499), Dalinpu, Siaogang, Kaohsiung; F, Monomia gladiator (Fabricius, 1798), male (53.0 × 31.2 mm) (NCHUZOOL 16506), Erzihliao Fishing Port, Kaohsiung; G, Monomia lucida Koch & Ďuriš, 2018, male (54.8 × 30.7 mm) (NCHUZOOL 16538), Erzihliao Fishing Port, Kaohsiung; H, Xiphonectes tuberculosus (A. Milne-Edwards, 1861), males (24.3 × 14.3 mm) (NCHUZOOL 16530), Zuoying, Kaohsiung.

Fig. 9. Podophthalmus minabensis Sakai, 1961, male (25.2 × 14.9 mm) (NCHUZOOL 16499). A, carapace; B–E, right G1; B, C, dorsal view; D, E, ventral view.

Fig. 1. Taiwan main island and adjacent islets, with the collection localities shown in gray circles (see Table 1).