File:Bulletin - United States National Museum (1967) (14782056584).jpg

Identifier: bulletinunitedst2591967unit (find matches)
Title: Bulletin - United States National Museum
Year: 1877 (1870s)
Authors: United States National Museum Smithsonian Institution United States. Dept. of the Interior
Subjects: Science
Publisher: Washington : Smithsonian Institution Press, (etc.) for sale by the Supt. of Docs., U.S. Govt Print. Off.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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doubly inserted; dactyl claw long. Coxal platesof pereopods 2 and 3 with 5 or 6 marginal setae and spinides each;that of pereopod 4 with about 7 marginal setae. Bases of pereopods5-7: posterior margins somewhat produced posteriorly, convex; dis-toposterior lobes small, poorly defined. Dactyls of pereopods 5-7between 35 and 40 percent as long as corresponding propods. Seventhpereopod coxal gUls and pleonite sternal gdls absent; paused lateralsternal gills on pereonites 6 and 7 simple, not bifurcate. 32 U.S. NATIONAL MUSEUM BULLETIN 2 59 Abdominal side plates: posterior margins convex to nearly straight,with 2 or 3 setae each; posterior corners poorly developed, ratherblunt; ventral margins of plates 2 and 3 with 4 spines each. Pleopod1, inner ramus about equal m length to peduncle. Uropod 1 withup to 30 spines; inner and outer ramus about equal in length, a littlemore than 50 percent as long as peduncle. Uropod 2 with up to18 spines; outer ramus about 80 percent as long as inner ramus,
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Figure 5.—Stygonecles cooperi, new species. Male holotype (6.00 mm), Silers Cave,W. Va.: a,b, antennae 1,2; c, coxal plate of pereopod 3; d-g, pereopods 4,5,6,7; h, ab-dominal side plates; i, lower lip; /, telson; k,l, gnathopods 1,2; m,n, uropods 1,2; o,p,3rd uropods. SUBTERRANEAN AMPHIPOD STYGONECTES 33 which is about equal to pedimcle in length. Uropod 3: peduncleusually armed distolaterally with 1 spinide; ramus about 1/3 lengthof peduncle, armed apically with 2 or 3 spines. Telson about 35 to40 percent longer than broad, apical margin with a shallow excavation,each apical lobe armed with about 5 spines. Type locality.—Silers Cave, Berkeley Co., W. Va. The typelocality is a medium-sized, maze cave developed in Lower Devonianlimestone, which crops out as an isolated band west of North Mountainin the vicinity of Back Creek. The two male specimens were takenfrom a shallow, mud-bottom, seepage-fed pool distant from theentrance. Distribution and ecology.—This species is presently

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