. Bulletin - United States National Museum. Science. 60 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM Genus UNDEUCHAETA Giesbrecht, 1888 Head fused with the first segment, with or without a crest; fourth and fifth segments fused with rounded posterior corners; urosome 4-segmented in female, 5-segmented in male; genital segment asym- metrical ; exopod of second antennae less than twice the length of the endopod; exopod of first leg 2-segmented in female, 3-segmented in male, rami of the three following pairs of legs 3-segmented; fifth legs lacking in the female; present and biramose in the male,
. Bulletin - United States National Museum. Science. 60 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM Genus UNDEUCHAETA Giesbrecht, 1888 Head fused with the first segment, with or without a crest; fourth and fifth segments fused with rounded posterior corners; urosome 4-segmented in female, 5-segmented in male; genital segment asym- metrical ; exopod of second antennae less than twice the length of the endopod; exopod of first leg 2-segmented in female, 3-segmented in male, rami of the three following pairs of legs 3-segmented; fifth legs lacking in the female; present and biramose in the male, KEY TO THE SPECIES (BOTH SEXES) 1. Head with a moderately high crest; genital segment in female with a ventral spine on the right side major (p. GO) Head without a crest; genital segment in female with a dorsolat- eral spine on the right side minor (p. 61) UNDEUCHAETA MAJOR Giesbrecht FiGUBB 39 Vtideuchaeta major Giesbrecht, Fauna und Flora des Golfes von Neapel, vol. 19, p. 227, pi. 37, 1892. Occwrence.—One male and two females from trawl wings, Stations 2195, 2219, Albatross; five young males and adult females in vertical haul, Station 10313, Gratrifpu^; the former stations south of Nan- tucket. Distribution. — North- ern Pacific (Giesbrecht); northern Atlantic (With, Far ran) ; southern At- lantic (Cleve) ; Cali- fornia coast (Esterly); Malay Archipelago (A. Scott); Gulf of Maine (Bigelow). Color.—Body colorless and not very transparent, with red pigment scat- tered through the bases of the mouth parts, espe- cially the maxillipeds. In the male the plumose setae of the caudal rami, the second antennae, and the mandibles are brightly colored. In alcohol and formalin the body takes on a uni- form pinkish or reddish hue. ^e^i^iZe.—Head with a prominent crest and a pointed rostrum; posterior corners of fused fourth and fifth segments angular but. FiGDRB 39.—Undeuchaeta major: a. Female, dorsal (after Sars) ; b, urosome, lateral; c, male, fifth legs (6 and o after Gies
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