Cymadusa hawaiensis (Schellenberg 1938)

Cymadusa hawaiensis (Schellenberg)

Grubia hawaiensis Schellenberg, 1938, pp. 88-90, fig. 45.

DIAGNOSIS OF MALE.—Pleonal epimera 1–2 with lateral ridges, all with small rounded posteroventral tooth, notch and setule; gnathopods 1–2 elongate, articles 5-6 of gnathopod 1 equal to each other in length, article 4 with large conical posterodistal extension partly guarding article 5, latter with truncate, setose posterior lobe with quadrate corner, article 6 about as broad as 5 but basally constricted, palm very oblique, shorter than posterior margin of hand, defined by spine, dactyl overlapping palm, article 2 with broadly triangular anterodistal lobe; gnathopod 2 larger than 1, lobe on article 2 low and obtuse, extension on article 4 smaller than on gnathopod 1, article 5 shorter than 6, posterior lobe slightly convex, article 5 of same size as on gnathopod 1 but less setose, article 6 large, similar in shape to that of gnathopod 1, palm slightly more prominent, defined by large spine, dactyl overlapping palm and closing across medial face of hand; article 2 of pereopods 1–2 about 3 times as long as broad; pereopods 3–5 with simple sixth articles bearing pair of straight locking spines, full lengths of anterior margins bearing more spines in tandem, dactyl with a few striations; article 2 of pereopod 3 of medium breadth, pyriform, with stout posterodistal spine and not lobate, pereopods 4-5 with narrower, pyriform article 2 bearing row of several posterodistal marginal spines, anterior margin of article 2 of pereopods 3–5 lined with stout short spines; antenna 1 as long as head and first 8 body segments, antenna 2 as long as head and first 5 body segments, accessory flagellum 2-articulate, article 2 on peduncle of antenna 1 slightly longer man article 1, article 3 short, flagellum of antenna 2 nearly as long as peduncular articles 4–5 together; apical lobules on lower lip of medium tumidity but lateral lobules projecting much farther than medial; coxa 1 produced forward, peduncular process between rami of uropod 1 long, that on uropod 2 obsolescent, sharp and leaflike, peduncle of uropod 1 with several ventrolateral setae, uropod 3 widi many peduncular spines, outer ramus slightly shorter than inner, latter with 2 or more medial spines; eyes ochraceous, clear in alcohol.

FEMALE (from Schellenberg, 1938).—Gnathopods weaker than in male, article 4 angular but not produced, gnathopod 2 like gnathopod 1, article 4 triangular.

ABERRATION.—Male, 10.3 mm, with right uropod 3 bearing extra, blunt apical spine on outer ramus considerably shorter than inner.

MATERIAL.—Hanauma Bay, Oahu, 15 May 1946 (3 males); Waikiki Marine Laboratory, from Padina, 11 March 1964 (1 male).

DISTRIBUTION.—Schellenberg: “North Islands”; Kaneohe Bay, Oahu.