Presently, the family Upogebiidae Borradaile, 1903 includes 179 species of 13 genera worldwide, however, only two species of the genus
Carapace length and total length are abbreviated as “CL” and “TL”, which are used as an indication of the size of the specimen. CL is measured from the tip of the rostrum to the posterior border of the carapace, while TL is measured from the tip of the rostrum to the posterior border of the telson. All specimens were preserved in 95% ethanol. Materials examined in this study are deposited at the Tidal Flat Research Institute, National Fisheries Research and Development Institute.
Order Decapoda Latreille, 1803 Family Upogebiidae Borradaile, 1903 1*Genus Austinogebia Ngoc-Ho, 2001
Antennular peduncle (Fig. 1C) 3-segmented, segment 2 shortest, segment 3 longest.
Antennal peduncle (Fig. 1D) 3-segmented, segment 1 with small subdistal spine ventrally, scaphocerite terminating in blunt tooth.
Epistome (Fig. 1B) with 2 distinct spines.
Third maxilliped (Fig. 1E) with exopod failing to reach distal margin of merus; epipod present.
First pereiopod (Figs. 1F, G, 3F, I) subcheliform; basis (Fig. 1F) with sharp ventral spine; ischium (Fig. 1F) with 2 spines on ventral margin; merus with subdistal spine on dorsal margin and 5 spines on ventral margin (Fig. 1F); carpus (Fig. 1G) bearing longitudinal crest on dorsal surface with conspicuous spinules and terminating in spine, large distal spine on ventral margin, inner surface with 3 spines on distal margin; propodus 1.5 times as long as broad, dorsal margin with row of 10 spines, of which distal one largest, outer surface (Figs. 1F, 3F) with distal spine near fixed finger; fixed finger curved distally, with large rounded tooth on middle of cutting edge, inner surface (Figs. 1G, 3I) with translucent longitudinal carina on distal fourth; dactylus two-thirds as long as propodus, with corneous tip, dorsal surface with shallow longitudinal median groove, dorsomesial surface with longitudinal carina terminating large tubercle distally, large tooth on cutting edge proximally.
Second pereiopod (Fig. 1H) shorter than first pereiopod; merus with subdistal spine on dorsal margin, 3 spines on ventral margin increasing in size proximally; carpus bearing distal spine on dorsal margin; propodus and dactylus relatively broad, unarmed.
Third pereiopod (Fig. 1I) shorter than second pereiopod; merus with 2 spines on ventral margin; carpus and propodus noticeably convex on dorsal margins; dactylus slender.
Fourth pereiopod (Fig. 1J) as long as third pereiopod, unarmed; dactylus slender.
Fifth pereiopod (Fig. 1K) unarmed; carpus slender; propodus longer than carpus, slender; dactylus extremely short.
First pleopod absent.
Uropod (Fig. 1L) broad; protopod with acute spine on posterior margin; endopod reaching beyond posterior margin of telson, proximal knob on lateral margin, with 2 longitudinal ridges; exopod convex on lateral margin, with 3 ridges; posterior margins of endopod and exopod without spinules.
Telson (Fig. 1L) 1.4 times as broad as long; posterior margin slightly convex.
[Fig. 1.] Austinogebia wuhsienweni (Yu, 1931), male (carapace length 21.3 mm, total length 69.1 mm). A, Carapace, dorsal; B, Carapace, lateral; C, Right antennule, lateral; D, Right antennna, lateral; E, Right third maxilliped, lateral; F, First pereiopod, outer view; G, First pereiopod, inner view; H, Second pereiopod, lateral; I, Third pereiopod, lateral; J, Fourth pereiopod, lateral; K, fifth pereiopod, lateral; L, Telson, dorsal. Scale bars: A-C, F-L=5 mm, D, E=2 mm.
[Fig. 3.] Anterior part of carapace, lateral view. A, Upogebia major (De Haan, 1839); B, Upogebia issaeffi (Balss, 1913); C, Austinogebia wuhsienweni (Yu, 1931). Male first pereiopod, inner view. D, Upogebia major (De Haan, 1839); E, Upogebia issaeffi (Balss, 1913); F, Austinogebia wuhsienweni (Yu, 1931). Male first pereiopod, outer view. G, Upogebia major (De Haan, 1839); H, Upogebia issaeffi (Balss, 1913); I, Austinogebia wuhsienweni (Yu, 1931).