Cystisoma neptunus Guérin

Zeidler, Wolfgang, 2003, A review of the hyperiidean amphipod family Cystisomatidae Willemöes­Suhm, 1875 (Crustacea: Amphipoda: Hyperiidea), Zootaxa 141, pp. 1-43 : 38

Cystisoma neptunus Guérin ­Méneville

Cystisoma neptunus Guérin­Méneville, 1842: 215 ­216, pl. 1, fig. 1.

The type seems to be lost. It is not in the ANSP, which holds most of the Guérin­Méneville collection ( Zeidler 1997), and it is not present in the collections of the MNHN (checked personally by T. Laperousaz), or the BMNH.

In the past it has been considered a questionable synonym of C. pellucida (e.g. Vinogradov et al. 1982), but the antennae and uropods of C. pellucida are quite distinctive, and unlike that illustrated for C. neptunus by Guérin­Méneville (1842). The specimen illustrated by Guérin­Méneville appears to be male, as pereopod 7 would have differentiated at 80 mm if the specimen was female. The length of the antennae and pereopods resemble C. longipes ( Bovallius, 1886) , but in the absence of knowledge regarding the teeth on the mandible, this species cannot be determined with certainty.