Crabs (Crustacea, Decapoda) from the Seas of East and Southeast Asia Collected by the RV Hakuhō Maru (KH- 72 - 1 Cruise) 3. Sahul Shelf Author Manikandan, K Author Megalaa, N Author Valliappan, Subramanian Author Nandini, K Author Rani, Lourdu V Author Dakshinamurthi, Senthil Author Nagappan, Nagappan text Bulletin of the National Museum of Nature and Science. Series A, Zoology 2022 2022-05-20 48 2 35 83 http://dx.doi.org/10.4103/jpbs.jpbs_806_23 journal article 303514 10.50826/bnmnszool.48.2_35 ae1af4e1-c35d-41db-99cc-8e05c3e3f510 2434-091X 13824279 Achaeus brevirostris ( Haswell, 1879 ) ( Figs. 5A , 11A–C ) Material examined . RV Hakuhō Maru KH-72-1 cruise, sta. 29, 1Ə ( CB 4.9×CL 7.2 mm ), NSMTCr 30705; 1 Ə (5.1× 7.6 mm ), NSMT-Cr 30706. Fig. 5.ɹA: Achaeus brevirostris (Haswell) , Ə (NSMT-Cr 30706; CB 5.1×CL 7.6 mm) from sta. 29. B: Achaeus lacertosus Stimpson , ♀ (NSMT-Cr 30707; CB 3.2×CL 3.8 mm) from sta. 29. C: Achaeus paradicei Griffin , Ə (NSMT-Cr 30709; CB 3.6×CL 4.7 mm) from sta. 29. D: Oncinopus kathae Davie , ovig. ♀ (NSMT-Cr 30711; CB 5.8×CL 7.9 mm) from sta. 29. E: O. postillonensis Griffin and Tranter , ovig. ♀(NSMT-Cr 30712; CB 5.4×CL 6.2 mm) from sta. 29. Remarks. Davie (2002) listed eight Australian species of the genus Achaeus , and two more species remained unidentified in Poore et al. (2008) . This long-neck species identified as A. brevirostris is characteristic in having the smooth carapace surface without prominent spines or tubercles. Although all the chelipeds and ambulatory legs are missing in the male examined ( Fig. 5A ), the identification as A. brevirostris is reasonable, with some characters subject to variation. First, it is noted that the hepatic region of the carapace of the male is strongly developed as a triangular tooth in dorsal view and seems to be proportionally larger than the illustration of Griffin (1970: fig. 1a). There are otherwise some discrepancies in the number of granules on the branchial region, the shape of the male telson, and the curvature and twist of the G1, most of which have been difficult to illustrate and explain accurately. In this study, these differences ( Fig. 11A–B ) are considered to represent individual or developmental variations. Distribution. Indo-West Pacific from Zanzibar in East Africa to the Sulu Archipelago in the Philippines through Australian and Indonesian waters, 11–57 m depth. An unusual depth, 304 m , was recorded from off the Kai Islands by Griffin and Tranter (1986) .