Oncinopus kathae Davie, 2011

Manikandan, K, Megalaa, N, Valliappan, Subramanian, Nandini, K, Rani, Lourdu V, Dakshinamurthi, Senthil & Nagappan, Nagappan, 2022, Crabs (Crustacea, Decapoda) from the Seas of East and Southeast Asia Collected by the RV Hakuhō Maru (KH- 72 - 1 Cruise) 3. Sahul Shelf, Bulletin of the National Museum of Nature and Science. Series A, Zoology 48 (2), pp. 35-83 : 46-47

Oncinopus kathae Davie, 2011

( Fig. 5D )

Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 29, 1 ovig.♀ ( CB 5.8×CL 7.9 mm), NSMT-Cr 30711.

Remarks. The present knowledge of the genus Oncinopus was well summarized by Davie (2011), with five species, O. aranea (De Haan, 1839) , O. neptunus Adams and White, 1848 , O angustifrons Takeda and Miyake, 1969 , O. postillonensis Griffin and Tranter, 1986, and O. kathae Davie, 2011 . All the species have been weakly chitinized and rather similar to each other in the general form of the carapace, chelipeds and ambulatory legs, but the G1 is the most important criterion, with the characteristic twisted form in each species ( O. neptunus by Takeda and Miyake, 1969b: figs. 3, 5a–b; O. angustifrons by Takeda and Miyake, 1969b: fig. 5c–d; O. aranea by Takeda and Miyake, 1969: fig. 5e–f; O. postillonensis by Griffin and Tranter, 1986 a: fig. 6b; O. kathae by Davie, 2011: fig. 5E).

The present specimen ( Fig. 5D ) identified as O. kathae is an ovigerous female, but definitive identification is possible by the rostrum being deeply excavated and forming an anteriorly-directed, narrow tubercle at each side. Each dactylus of the first two ambulatory legs is provided with long, soft setae along the inner margin in addition to a line of hard setae, which were considered by Davie (2011) as unique of O. kathae .

Distribution. Gulf of Carpentaria and northwest shelf of Western Australia, 8–83 m depth.

Figures

Fig. 5.ɹA: Achaeus brevirostris (Haswell), Ə (NSMT-Cr 30706; CB 5.1×CL 7.6mm) from sta. 29. B: Achaeus lacertosus Stimpson, ♀ (NSMT-Cr 30707; CB 3.2×CL 3.8mm) from sta. 29. C: Achaeus paradicei Griffin, Ə (NSMT-Cr 30709; CB 3.6×CL 4.7mm) from sta. 29. D: Oncinopus kathae Davie, ovig. ♀ (NSMT-Cr 30711; CB 5.8×CL 7.9mm) from sta. 29. E: O. postillonensis Griffin and Tranter, ovig. ♀(NSMT-Cr 30712; CB 5.4×CL 6.2mm) from sta. 29.