Octopupilla, 2007

Tomikawa, Ko, Kobayashi, Norio, Morino, Hiroshi & Mawatari, Shunsuke F., 2007, New gammaroid family, genera and species from subterranean waters of Japan, and their phylogenetic relationships (Crustacea: Amphipoda), Zoological Journal of the Linnean Society 149 (4), pp. 643-670 : 652-653

OCTOPUPILLA TOMIKAWA GEN. NOV.

Diagnosis: Eyes vestigial, represented by eight pigment spots; dorsal margin of urosomite 3 with robust setae; inner plate of maxilla 2 with facial setae in oblique row; carpus of gnathopods 1 and 2 not lobate; propodus of gnathopods 1 and 2 elongate; peduncle of pleopods with marginal setae; epimeral plates 2 and 3 with robust ventromarginal setae; uropod 3 magniramous (length of inner ramus about 0.7 × length of outer ramus).

Type species: Octopupilla felix Tomikawa sp. nov. by monotypy.

Etymology: The genus name is from the Latin octo (eight) and pupilla (pupil) referring to the vestigial eyes represented by eight pigment spots.

Remarks: Octopupilla is distinguished from Eoniphargus by the following characters ( Eoniphargus in parentheses): eyes are vestigial, represented by eight pigment spots (absent); the dorsal margin of the urosomite 3 has robust setae (lacking); epimeral plates 2 and 3 with robust ventromarginal setae (setae lacking); uropod 3 is magniramous (parviramus); and the inner ramus of uropod 3 is 0.7 times as long as the outer (0.3 times).