Caviallianassa Poore, Dworschak, Robles, Mantelatto and Felder, 2019

Poore, Gary C. B., 2023, New records, one new genus and 21 new species of Callianassidae (Crustacea, Axiidea) from the Indo-West Pacific, Memoirs of Museum Victoria 82, pp. 167-255 : 179

Caviallianassa Poore, Dworschak, Robles, Mantelatto and Felder, 2019

Caviallianassa Poore et al., 2019: 92 .— Robles et al., 2020.—

Poore and Ahyong, 2023: 211.

Remarks. Robles et al. (2020) used tissue from three codenamed “species” in their molecular phylogram. They are described as two species here, linked to Caviallianassa cavifrons (Komai and Fujiwara, 2012) . All share a short flat rostrum, operculiform maxillipeds 3 with dense setae on upper (extensor) margin of the dactylus, compact chelipeds with a row of tubercles on the lower margin of the merus beyond a proximal tooth or series of small short spines. Only the female of the type species, C. cavifrons , is known. Here, the male pleopods 1 and 2, maxilliped 3 and the uropodal setation that characterise the genus are figured for one of the new species. The major cheliped, propodus of pereopod 3 and the shape of the uropodal rami differ significantly between species.

Callianassa thailandica Sakai, 2005 was listed in Caviallianassa by Poore et al. (2019). The species had earlier been included with many others in Trypaea ( Sakai, 2011) . Inclusion in Caviallianassa can no longer be justified because the holotype male has a narrow maxilliped 3 quite different from that of other species of Caviallianassa . Sakai (2005) illustrated two detached male chelipeds that may belong to different genera – he reported another callianassid, C. amboinae (Bate, 1888) , now Scallasis amboinae , from this locality in the Andaman Sea, Galathea stn 394, but the chelipeds are unlikely to be from this species. For the time being, C. thailandica is treated as species inquirenda.