Three new species of Thalassinidea are described from deep water (350-400 m) off Taiwan: Acanthaxius formosa and Acanthaxius grandis (family Axiidae), and Calastacus crosnieri (family Calocarididae). The latter is the first record of the genus from the western Pacific, and the fifth species to be described. Six species of Acanthaxius have previously been described, five from the Pacific, and one from the western Atlantic.
Crustacea, Decapoda, Thalassinidea, Axiidae, Calocarididae, Taiwan, new species.