Two new species of the genus Anisomysis (Anisomysis) (Crustacea, Mysida, Mysidae) from coral reef waters in Thailand

Abstract

Two new species of Anisomysis Hansen, 1910 (Mysida, Mysidae), Anisomysis (Anisomysis) spinaintus sp. n. and A. (A.) phuketensis sp. n., from coral-reef waters in Thailand are described. Anisomysis (A.) spinaintus, collected in the Chaolao Beach, Chanthaburi Province, is distinguished from the closely allied species A. (A.) incisa Tattersall, 1936, and A. (A.) hawaiiensis Murano, 1995, by the presence of 6–9 spines on the apical cleft of telson, which are absent in the latter two allied species. The new species can also be distinguished from A. (A.) aikawai Ii, 1964, by the presence of a deep telson cleft and a large number of spines on the lateral margin of telson. A. (A.) phuketensis sp. n., collected in Ko Lon, Phuket, is distinguished from the allied species A. (A.) robustispina Panampunnayil, 1984, by having a short telson and a pair of long spines on the apical part of the telson. Keys to the subgenera and species of Anisomysis, including the two new species, are presented.