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Comprehensive Description

provided by Smithsonian Contributions to Zoology
Gitanopsis pele

DIAGNOSIS.—Body without dorsal cusps; lateral cephalic lobe broadly rounded; eye large, with core of black pigment in alcohol; antennae extending subequally; gnathopods small but palms strong and nearly transverse, stout lobe of article 5 on gnathopod 1 extending about halfway along article 6 and about 75–85 percent on gnathopod 2, sixth articles weakly expanded distally and much longer than broad, about half as broad as their coxae, dactyls proximally pectinate on inner edges; coxa 1 distally tapering and subconical, posteroventral corner serrate, coxa 2 with 1 small posteroventral notch; mandibular molar large, cushion-shaped, strongly triturative; outer plate of maxilliped with mediodistal margin slightly excavate and pectinate (as in Gitanogeiton and Gitanopsis tortugae); dactyls of pereopods 1–5 simple; pleonal epimera 1–2 each with small posteroventral tooth, cpimeron 3 rounded-quadrate posteroventrally; telson of medium length, about 60 percent as long as peduncle of uropod 3, apically rounded but coniform.

HOLOTYPE.—Bishop Museum collections, catalog number 7251, ovigerous female, 2.7 mm.

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

MATERIAL.—JLB Hawaii 10 (50).

RELATIONSHIP.—This species resembles the Caribbean G. tortugae Shoemaker (1933a, p. 248, fig. 2). Maxilla 1 and the accessory flagellum of the 2 species are similar among numerous other characters of even greater importance. Gitanopsis pele differs from G. tortugae primarily in two minor characters: (1) the serrations of coxae 1–2 and (2) the large eyes.

Gitanopsis pusilla K. H. Barnard (1916) from South Africa and G. vilordes J. L. Barnard (1962c) from California differ from G. pele and G. tortugae in their large gnathopods with article 6 wider than their coxae and strongly expanded distally. Gitanopsis pusilloides Shoemaker (1942) from Pacific Mexico has very short processes on article 5 of the gnathopods and more strongly transverse palms than do G. pele and G. tortugae.

DISTRIBUTION.—Hawaiian Islands.

Mokuoloe, new genus

DIAGNOSIS.—Rostrum short; flagella of first and second antennae 4 and 2-articulate respectively, bearing long aesthetascs; epistome nearly flat anteriorly; upper lip evenly incised; mandible with triturative molar and normal 3-articulate palp; lower lip angularly excavate medially; palp of maxilla 1 uniarticulate, bearing large strap-shaped terminal setae, outer plate with 7 spines, inner plate short and truncate; maxilla 2 with apically truncate lobes; outer plate of maxilliped large and exceeding end of palp article 2, palp article 3 apicomedially produced as thumb, dactyl stout and closing on thumb; coxa 2 larger than coxa 1; gnathopods 1–2 of medium stoutness, subchelate, dactyl of gnathopod 1 strongly overlapping palm, of gnathopod 2 fitting palm, article 5 of gnathopod 1 lobe obsolete, of gnathopod 2 lobe extending more than halfway along article 6, palms of gnathopods deeply and sharply serrate; pereopods 3–4 with slender article 2, pereopod 5 with expanded article 2; uropod I longest, uropods 2-3 extending successively less, outer ramus of uropod 3 shorter than inner ramus; telson extending almost to apex of uropod 3, boat-shaped, triangular, entire, with lateral keel; pleonite 4 long, weakly keeled bilaterally on dorsal surface, pleonite 5 covered by junction of 4 and 6, 6 with weak lateral keel on each side and not vaulting over telson.

TYPE-SPECIES.—Mokuoloe ninole, new species.

RELATIONSHIP.—Peltocoxa Catta (Chevreux and Fage, 1925) and Hoplopheonoides Shoemaker (1956) from Florida are the cyproidins seemingly closest to this genus—not various Australian and New Zealand genera, but even relationships with those two Atlantic genera are weak.

Peltocoxa Catta has a long maxillipedal palp, slender inner plate of maxilla 1, strong mandibular lobes on the lower lip, narrow lobes on maxilla 2, no strap-shaped setae, a dorsoventrally thickened telson, inflated article 2 of pereopod 4, small gnathopods, gnathopod 2 with transverse palm and gnathopod 1 with oblique palm confluent with the posterior margin of article 6 and bearing only articulate spines.

Hoplopheonoides has small gnathopods with rectangular sixth articles and transverse palms, an enormous urosomite 1 with dorsal keel, no mandibular palp, long maxillipedal palp, and numerous other differences.
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bibliographic citation
Barnard, J. L. 1970. "Sublittoral Gammaridea (Amphipoda) of the Hawaiian Islands." Smithsonian Contributions to Zoology. 1-286. https://doi.org/10.5479/si.00810282.34