Cymonomus chani Ahyong & Ng, 2017

Ahyong, Shane T., Mitra, Santanu & Ng, Peter K. L., 2020, Cymonomid crabs from southwestern Indonesia and redescription of Cymonomus andamanicus Alcock, 1905, Raffles Bulletin of Zoology 68, pp. 62-69 : 65

Cymonomus chani Ahyong & Ng, 2017

( Fig. 3A )

Cymonomus sp. 4 — Nagai, 1994: 53, pl. 1, fig. 9.

Cymonomus andamanicus — Ho et al., 2004: 647, fig. 1H. — Ahyong et al., 2009: 179–180 (part), fig. 135–136. [Not C. andamanicus Alcock, 1905 ]

Cymonomus soela — Takeda et al., 2005: 108–109, fig. 2. [Not C. soela Ahyong & Brown, 2003 ]

Cymonomus chani Ahyong & Ng, 2017: 2–4 , fig. 1, 7A.

Material examined. ZRC 2019.1093 , 1 ovigerous female (cl 9.9 mm, pcl 9.1 mm, cw 10.0 mm), eastern Indian Ocean , south of Cilacap, Java, Indonesia, 8° 10.065 –09.802 ′S, 108° 37.439 –37.145 ′E, 970–1,013 m, mud with pieces of wood, SJADES 2018 Expedition, stn CP44, 31 March 2018 .

Remarks. The present specimen agrees well with C. chani , previously reported from the South China Sea, Taiwan and southern Japan, and represents a significant southward range extension into the eastern Indian Ocean. The key morphometric traits of the SJADES specimen are consistent with those reported by Ahyong & Ng (2017) for C. chani : pereopod 3 merus 0.95× pcl (reported range 0.91–1.02× pcl) and antennular peduncle 0.91× pcl (reported range 0.80–0.90× pcl).

Distribution. Southern Japan, Taiwan, the northern South China Sea and now from southwestern Indonesia; 650–1,134 m ( Ahyong & Ng, 2017).

Figures

Fig. 3. Colour in life. A, Cymonomus chani Ahyong & Ng, 2017, ovigerous female (cl 9.9 mm, pcl 9.1 mm, cw 10.0 mm), Java, stn CP44, ZRC 2019.1093. B, Cymonomus java, new species, male holotype (cl 8.2 mm, pcl 7.5 mm, cw 7.6 mm), Java, CP35, MZB Cru 5024. Photographs: T.-Y. Chan.