Two new species of the genus Kamaka (Crustacea: Amphipoda: Kamakidae) from Songkhla Lagoon, southern Thailand

Two new species of the genus Kamaka Dershavin, 1923 (Crustacea: Amphipoda: Kamakidae) are described from Songkhla Lagoon in southern Thailand. Kamaka appendiculata sp. nov. has unique lamellate appendix on peduncle of antenna 2 in adult male. Kamaka songkhlaensis sp. nov. has swelled peduncular article 4 of antenna 2 and wide propodus of gnathopod 2 in adult male. Morphological characters of K. songkhlaensis closely resemble those of K. poppi Bamber, 2003 from Hong Kong and K. taditadi Thomas & Barnard, 1991 from Papua New Guinea, Indonesia and Malaysia; however, K. songkhlaensis can be distinguished from K. poppi by the peduncular article 4 of male antenna 2 without distal spine and the convex distal margin of propodus of male gnathopod 2, and from K. taditadi in the right-angled posteroventral corner of male coxa 1 and the propodus of male gnathopod 2 without blunt triangular process on anterior margin.