Ischyrocerus kapu J. L. Barnard 1970

Ischyrocerus kapu

DESCRIPTION.—Aspect generally like that of Jassa lilipuna, new species, but coxae all shorter, coxa 1 as long as 2 and coxa 5 as long as 4, thus, assignable provisionally to Ischyrocerus; eyes, head, mandible, maxillae, maxillipeds, uropods 1–2, telson all similar to those of J. lilipuna; pereopods 3–5 and antennae unknown, missing from all specimens; gnathopod 1 with only one defining spine on palm, dactyl very long and slender, overlapping palm; coxa 1 trapezoidal, coxae 2–4 much shorter than broad; male gnathopod 2 with broadly lobate articles 2–3, article 4 immensely produced posterodistally to form substitute palmar defining tooth, article 5 triangular and enclosed posteriorly by article 4, article 6 elongate, apically broadened, lacking defining tooth on palm, latter occuping entire posterior margin of article 6, distal end of palm with 2 large processes separated by deep, flat-bottomed excavation, proximal tooth subconical, distal process spinose and asymmetrically triangular, dactyl very long and strongly overlapping palm and process of article 4; article 6 of pereopods 1–2 longer and more slender than article 6 of J. lilipuna, bearing only 2 posterior setae, no locking spines, dactyl long and simple; rami of uropod 3 much longer than on J. lilipuna, outer with about 12 very minute serrations visible generally on oil immersion lens only, inner ramus longer than outer and bearing 1 apical spinule.

HOLOTYPE.—Bishop Museum collections, catalog number 7286, male, 1.4 mm.

TYPE-LOCALITY.—JLB Hawaii 10, Kaneohe Bay, Oahu, 2 m, Pocillopora, 23 February 1967.

MATERIAL.—JLB Hawaii 3 (1), 6 (1), 10 (male, 1.4 mm, figured).

DISTRIBUTION.—Hawaiian Islands.