Gammaropsis digitata (Schellenberg 1938)

Gammaropsis digitata (Schellenberg)

Eurystheus digitatus Schellenberg, 1938, pp. 84–86, fig. 44.—J. L. Barnard, 1965a, pp. 535–536, fig. 30.

DIAGNOSIS OF MALE.—Lateral cephalic lobes strongly extended, narrow, antenna 2 moderately recessed along ventral margin; eyes obliquely ovate and elongate, rusty pink in alcohol; epistome unproduced; right mandibular molar with strong flake and seta; inner plate of maxilla 1 with about 5 long medial and 2 short terminal setae; antennae 1–2 equal to each other in length, relatively stout, nearly as long as head and pereon together, flagella nearly 40 percent as long as peduncles, accessory flagellum 4-articulate; coxa 1 bluntly angular at anteroventral corner, coxae otherwise normal and not enlarged; article 6 of gnathopod 1 ovate, not expanded, article 5 bearing 1 thin anterior seta; palm of gnathopod 2 basically transverse, with large tooth becoming split off posterior margin of article 6 and becoming more strongly gaped with increase in age, crotch of tooth with large articulate spine, reduced to a seta and finally lost in adults, distal end of palm with stout falciform protuberance, dactyl strongly curved at base and maintained in a transverse position; article 2 of pereopods 3–5 slender and weakly ovatopyriform, not rectangular; pleonal epimera 1–3 with slight posteroventral notch and tooth, posterior bulges of medium extent; urosomites 1–2 each with 1 dorsolateral seta on each side but otherwise simple; outer ramus of uropod 2 lacking article 2; telson deeply excavate dorsally; uropod 2 with slight peduncular tooth between rami.

FEMALE.—Palm of gnathopod 1 evenly convex and not bearing slight sinuosity seen in male; gnathopod 2 small, palm unexcavate, bearing stout spines.

MATERIAL.—Canton Island, February 1958, Drs. Degener (4).

DISTRIBUTION.—Micronesia, Southern Polynesia, and the Hawaiian Islands.