How can I differentiate between Eucidaris thouarsii and E. Galapagensis?

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Hudson Alves Pinto

Dear Damián Coronel,

According to Lessios et al. 1999 (attached file), the morphological differences between Eucidaris species are slight.

Maybe Eucidaris thouarsii and E. galapagensis are cryptic species.

Best regards,

Hudson

Gayashan M. Arachchige

Dear Damian,

According to the original description given by the Doderlein Eucidaris galapagensis differs from E. thouarsii by its thick, club-shaped primary spines, in lacking the naked margin on the apical plates, and in the much narrower interporiferous zone, in which the secondary tubercles are arranged in a single, median series; further the large globiferous pedicellariae are stated to be conspicuously different.

Source: Mortensen, T. (1928b). A Monograph of the Echinoidea. I. Cidaroidea, 551 pp., C. A. Reitzel & Oxford University Press, Copenhagen & London.

page(s): 399

Gayashan