Pleonexes poipu (J. L. Barnard 1970)

Ampithoe (Pleonexes) poipu

DIAGNOSIS OF MALE.—All pleonal epimera posteroventrally rounded, lacking lateral ridges; article 6 of gnathopod 1 much longer than article 5, posterior lobe of article 5 very narrow and slightly hooked, article 4 widi small posterodistal lobe, article 6 rectangular, moderately thin, palm oblique, weak, defined by striate spine occurring almost on posterior margin of hand; gnadiopod 2 like gnathopod 1 and not strongly enlarged, distal lobe on article 2 of medium size; article 2 of pereopods 1–2 more than twice as long as broad; pereopods 3–5 with subprehensile sixth articles similar to but not as strong as those of A. kaneohe, new species, large striate sabre spine not guarding smaller palm as closely as in A. kaneohe, other member of distal pair very small and nearly straight, next proximal spine large and next to that one of medium size, dactyls strongly striate; antenna 1 much shorter than 2, peduncle of antenna 2 short and stout, flagellum heavily armed with setular brushes and nearly as long as peduncle; lateral apical lobules of lower lip much longer than medial; coxa 1 weakly produced forward; peduncular process of uropod 1 short and blunt, that on uropod 2 obsolescent and bluntly triangular, peduncle of uropod 1 with lateral setal row; eyes small (clear in alcohol but specimens old); telson with pair of large reverted dorsal hooks formed from normal nobs of other ampithoes.

FEMALE.—Gnathopods 1–2 like male gnathopod 1; antenna 2 with slightly thinner peduncle and flagellum than on male and flagellum only as long as articles 3–5 of peduncle.

HOLOTYPE.—Bishop Museum collections, catalog number 7256, male, 9.0 mm.

TYPE-LOCALITY.—Poipu Beach, Kauai, 17 September 1959, IV. 4. d, Chir. haw., collection H. Caspers.

MATERIAL.—Eleven specimens from the type-locality.

DISTRIBUTION.—Hawaiian Islands.