Cyclodorippidae of the SJADES 2018 biodiversity cruise in Indonesia (Crustacea: Decapoda: Brachyura)

The cyclodorippid crabs collected by SJADES 2018, the joint Indonesian-Singaporean expedition to southwestern Java and the Sunda Strait in Indonesia, are reported. Two species were collected, of which one is new to science. The new species, of the genus Ketamia Tavares, 1992, is most similar to K. proxima Tavares, 1993, from Madagascar, and is the fourth species of the genus to be recorded from Indonesian waters; a key to the species of Ketamia is provided. The second species, Tymolus glaucommus (Alcock, 1894), is reported for the first time since its description from the Andaman Sea more than a century ago. Tymolus glaucommus, long thought by many to be a junior synonym of T. uncifer (Ortmann, 1892) (type locality: Japan), is regarded here as a valid species that closely resembles, and may prove to be, a senior synonym of T. brucei Tavares, 1991, described from northwestern Australia.