Acanthonyx Formosa, a New Species of Spider Crab (Decapoda, Brachyura, Majidae) From Seaweed Beds in Taiwan

Abstract

A new species of spider crab, Acanthonyx formosa, is described from seaweed beds in Taiwan. The species is allied to A. euryseroche Griffin & Tranter, 1986, from western Australia, but differs markedly in the proportions of the adult male rostrum, and in the structure of the hepatic tooth, the third maxilliped, the adult male chela, and the male first pleopod. Acanthonyx formosa is only the second species of Acanthonyx known from the Pacific, the other being A. simplex Dana, 1852, from Hawaii. Une nouvelle espece de crabe, Acanthonyx formosa, est decrite de lits d'algues, a Taiwan. L'espece est apparentee a A. euryseroche Griffin & Tranter, 1986, d'Australie occidentale, mais en differe nettement dans les proportions du rostre du male adulte, la structure de la dent hepatique, le troisieme maxillipede, la pince du male adulte et le premier pleopode male. Acanthonyx formosa n'est que la seconde espece du genre connue du Pacifique, la premiere etant A. simplex Dana, 1852, des Hawa.