Upogebia jiaruii, Liu, 2015

Liu, Wenliang, 2015, Two new species of the genus Upogebia Leach, 1814 (Crustacea: Decapoda: Gebiidea: Upogebiidae) from the South China Sea, Raffles Bulletin of Zoology 63, pp. 418-425 : 418-421

Upogebia jiaruii , new species

( Figs. 1–3 )

Material examined. Holotype: male (cl. 4.3 mm), MBM136979 /B92-B11-10, Sanya Bay , Hainan Province, South China Sea, intertidal zone with sandy substratum, coll. Kefeng Cui, 23 March 1992 . Paratype: ovig. female (cl. 6.7 mm), MBM136991 , data same as holotype. Others: 2 females (cl, 4.2–4.6 mm), MBM136790 / CJ97 C-160, Sanya Bay , Hainan Province, South China Sea, coll. Xinzheng Li, 3 March 1997 .

Description. Rostrum ( Figs. 1 , 2A, B ) rounded, about 0.7 times as long as basal width; anterior margin broadly convex, projecting slightly beyond eyes, bearing 2 small spiniform tubercles on each lateral margin, posterior one bigger than anterior one, without infrarostral spine; dorsal surface with dense setae and scattered many small tubercles extending onto gastric region of carapace. Carapace ( Fig. 2A, B ) with narrow lateral ridges, 10–11 small triangular teeth on lateral margin, weakly projecting forward, divided from lateral margin of rostrum by shallow notch; dorsal surface of carapace with dense setae but without conspicuous tubercles; anterolateral border unarmed; cervical groove long and deep, unarmed; postorbital region unarmed.

Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Science, East China Normal University, Shanghai 200062, China; Email: [e-mail] (* corresponding author)

© National University of Singapore

ISSN 2345-7600 (electronic) | ISSN 0217-2445 (print)

Eyestalks stout ( Fig. 2B ), unarmed; cornea darkly pigmented. Antennular peduncle reaching article 4 of antennal peduncle, unarmed. Antennal peduncle unarmed; article 3 with apically pointed scale on upper surface.

Maxilliped 3 ( Fig. 2D ) moderately stout; exopod consisting of 2 articles, exceeding proximal half of merus.

Male pereopod 1 symmetrical, subchelate, slender ( Fig. 3A , B). Basis and ischium unarmed. Merus about 2.0 times as long as high, 3.3 times as long as ischium, unarmed. Carpus triangular, about 0.5 length of merus, mesial face with 1 upper spine near to distal end. Propodus 1.9 times as long as high, 2.4 length of carpus, both lateral, mesial faces unarmed. Fixed finger triangular, shorter than dactylus; cutting edge curved, with 4–5 teeth on proximal half. Dactylus strong, about 0.4 length of palm; extensor margin arched, unarmed; cutting edge slightly curved, with 1 small blunt tooth at midlength; lateral surface carinate medially. Female pereopod 1 generally similar to that of male in shape and size.

Pereopod 2 ( Fig. 3C ) unarmed; merus about 3.2 times as long as high; carpus about 0.5 length of merus; propodus about 1.9 times as long as high; dactylus triangular, 0.5 length of propodus, terminating in corneous tip.

Pereopod 3 ( Fig. 3D ) unarmed; merus about 3.7 times as long as high; carpus about 0.6 length of merus; propodus about 2.3 times as long as high; dactylus slender, 0.7 length of propodus, terminating in corneous tip.

Pereopod 4 ( Fig. 3E, F ) with ischium unarmed. Merus unarmed, about 3.0 times as long as high. Carpus about 0.8 length of merus. Propodus about 1.8 times as long as high, with 16–19 long sharp bristle-like setae on distal half of lower margin. Dactylus terminating in corneous tip, slightly shorter than propodus, with 8–10 small bristle-like setae on lower margin and 1 small sharp spine on upper margin near distal end.

Pereopod 5 ( Fig. 3G ) semichelate, unarmed; dactylus elongate and curved.

Abdominal tergites smooth. Telson ( Fig. 2C ) subrectangular, slightly wider than long, 1.5 times as wide as long and about 0.9 length of abdominal somite 6; bearing two strong transverse carinae on dorsal surface; posterior margin broadly convex, unarmed.

Male pleopod 1 absent; pleopod 2–5 biramous, with exopods larger than endopods. Female pleopod 1 present, uniramous, consisting of 2 articles. Uropodal protopod unarmed (Fig. 2C); exopod rounded, almost as long as wide, slightly convex on posterior margin; endopod shorter than exopod, about 0.8 times as long as wide.

Remarks. This new species closely resembles Upogebia baweana Tirmizi & Kazmi, 1979 known from Indonesia, in the form of the rostrum (about 0.7 times as long as basal width) and both are armed with 2 small teeth on each lateral margin (Tirmizi & Kazmi, 1979; Sakai, 1982; Ngoc-Ho, 1990; Sakai, 2006). It differs from U. baweana in the dorsal surface of the telson bearing two strong transverse carina (versus bearing one indistinctly elevated transverse carina); the posterior margin of the telson being broadly convex (versus slightly concave); the propodus of pereopod 1 being relatively short, about 1.9 times as long as high (versus about 2.7 times as long as high), cutting edge of dactylus with 1 small blunt tooth at midlength (versus with two low triangular teeth).

Etymology. The species is named in honour of the late Professor Jiarui Shen (C. J. Shen), from the Institute of Zoology, Chinese Academy of Sciences, for his great contribution to the Chinese carcinology.

Distribution. Presently known only from the type locality.

Figures

Fig. 1. Upogebia jiaruii, new species. Holotype male, MBM136979, entire animal, laterral view. Scale bar = 1mm.

Fig. 2. Upogebia jiaruii, new species. Holotype male, MBM136979. A, anterior carapace, dorsal view; B, anterior carapace, lateral view; C, abdominal somite 6, telson and uropods, dorsal view; D, maxilliped 3, outer view. Scale bar = 1 mm (A, B, D); 0.6 mm (C).

Fig. 3. Upogebia jiaruii, new species. Holotype male, MBM136979. A, right pereopod 1, outer view; B, right pereopod 1, inner view; C, pereopod 2, outer view; D, peorepod 3, outer view; E, peorepod 4, outer view; F, dactylus and propodus of peorepod 4; G, peorepod 5, outer view. Scale bar = 1mm.