Echinoderes andamanensis sp. nov. is described from the Andaman Islands (Bay of Bengal, Indian Ocean). Unlike most members of this genus, this new species lacks middorsal spines. It is further distinguished by the presence of lateral spines on segments 4, 10 and 11 in the female and 4, 10–12 in the inale. Collected with E. andamanensis were specimens of E. ehlersi previously known only from a single specimen collected in 1885 in Zanzibar. The Andaman Island females have shorter spines than the males. Additional species include Catena gerlachi, previously known only from Walcair, India. A single juvenile exuvium of Pynophyes sp. was also found. The taxonomic relationships of the species and other members of the genus are discussed.
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Higgins et al. (1979) studied this question.
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