Taxonomy of the semiterrestrial crab Lepidothelphusa cognettii (Nobili, 1903) (Crustacea: Decapoda: Brachyura: Gecarcinucidae), with descriptions of five new species from Sarawak, Malaysia, Borneo Author Grinang, Jongkar Author Ng, Peter K. L. text Raffles Bulletin of Zoology 2015 2015-12-18 63 564 582 journal article 10.5281/zenodo.5386711 2345-7600 5386711 BAA493D3-8195-417B-ABD8-A36D3FD90533 Lepidothelphusa flavochela , new species ( Figs. 3A–I , 4A–E , 13C, D ) Material examined. Holotype : male (8.1 × 7.2 mm ) ( ZRC 2015.0604 ), 194 m above sea level , Pagar Besi, Kampung Gumbang, Bau, Sarawak , coll. J Grinang et al., 15 February 2013 . Paratypes : 4 males (largest 8.5 × 7.5 mm ), 5 females (largest 9.9 × 8.8 mm ) (SBC.C.00392–401), data same as holotype . Diagnosis. Carapace quadrate, surface relatively flat, rugose, anterolateral margins smooth; antero- and posterolateral regions slightly rugose; epibranchial tooth undiscernible; infra-, supra-orbital margins confluent gradually, external orbital tooth with outer margin concave, smooth; serrated projection on frontal region distinct; epigastric and postorbital cristae distinct, relatively low, margins serrated; cervical and H-grooves relatively shallow, not confluent ( Fig. 3A, B, D ); ischium of third maxilliped rhomboidal, much longer than broad, sulcus undiscernible ( Fig. 3F ); inner margin of merus of chelipeds with relatively lower serrated projection ( Fig. 3I ); carpus of chelipeds smooth, inner angle with broad, low triangular tooth ( Fig. 3A ); fingers of adult major male chela gaping ( Fig. 3G, H ); ambulatory legs relatively long, merus of fourth ambulatory legs subequal to length of carapace ( Fig. 3A, E ); male abdomen triangular, somite 6 width and length subequal, subequal to length of telson ( Fig. 3C ); G1 stout, sinuous in ventral view, straight in dorsal view; terminal segment straight in dorsal view, curved in ventral view ( Fig. 4A, B, D, E ); G2 with relatively long distal segment, about half length of basal segment ( Fig. 4C ). Colour. In life, males have uniformly yellow chela, creamwhite ambulatory legs and the anterior part of the carapace is yellowish-orange with the posterior part pale orange to yellowish-white. Females are dark brown overall ( Fig. 13C, D ). Etymology. The name is derived from the Latin “flavo” combined with chela, alluding to the entire yellowish chela. The name is used as a noun in apposition. Remarks. Lepidothelphusa flavochela , new species , is most easily distinguished from L. cognettii s. str. and congeners in having poorly developed epigastric and postorbital cristae ( Fig. 3B, D versus Figs. 1B, D , 5B, D , 7B, D , 9B, D , 11B, D ). Its coloration in life is closest to L. limau , new species , especially with the dorsal surface of adults having the anterior half orange and posterior part lighter; and the legs cream-white. The chelae are also similar in colour except that in L. flavochela , even the fingers are yellow ( Fig. 13C ) while in L. limau , the fingers are white ( Fig. 13E ). The yellow chela of L. flavochela ( Fig. 13C, D ) is a character shared by L. loi and L. sangon but these species have the carapace a more uniform reddish-brown to orange and the legs are reddish-brown ( Figs. 14A, B, E, F ). The G1s of these species are quite different. The terminal segment of the G1 of L. flavochela ( Fig. 4A, B, D, E ) is proportionately longer than that of L. limau ( Fig. 6A, B, D, E ) and L. loi ( Fig. 8A, B, D, E ), while in L. sangon , it is much straighter with the distal opening more flared and the lateral margins of the subterminal segment sinuous ( Fig. 12A, B, D, E ). Habitat. The habitat is similar to that of L. cognettii s. str. except that it is less than 200 m above sea level.