File:Bulletin - United States National Museum (1967) (14784079652).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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armed with a double row of 12 or 13 spine teeth; posteriorangle with 1 large spine and 4 smaller spines on outside, 5 small spineson inside; posterior margin with 2 or 3 sets of setae; superior lateralsetae few in number, inferior lateral setae singly inserted; dactyl with4 outer marginal setae unusually inserted as shown in figure 25, clawshort. Gnathopod 2: propod palmar margin less oblique, slightlyconvex proximally and slightly concave distally, armed with a doublerow of 15 or 16 spine teeth; posterior angle with 1 large spine and 4smaller spines on outside, 5 small spines on inside; posterior marginwith 6 sets of setae; superior lateral setae in transverse row, mostlydoubly inserted, inferior lateral setae singly and doubly inserted;dactyl claw short. Coxal plates of pereopods 1-4 with a few lessmarginal setae and spinules than S. clantoni but not otherwise appre-ciably different. Pereopod 7 about 50 percent as long as body, a 242-803—67 8 108 U.S. NATIONAL MUSEUM BULLETIN 259
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Figure 26.-—Stygonedes ozarkensis, new species. Male (13.5 mm), Danford Cave, Ark.:a,b, gnathopods 1,2; c-j, pereopods 4,5,6,7; g,h, antennae 1,2; t, coxal plate of pereopod3;y, uropod 3; k, telson; l,m, uropods 1,2. Female (12.00 mm), Henson Cave, Ark.;n, telson; o, uropod 3; p,q, uropods 1,2; r, abdominal side plates. SUBTERRANEAN AMPHIPOD STYGONECTES 109 little longer than pereopod 6 and about 35 to 40 percent longer thanpereopod 5. Pereopods 5-7 differmg from those of S. clantoni onlyin the form of the bases, which are proportionately less broad andpossess smaller distoposterior lobes. Basis of pereopod 7 more narrowthan bases of pereopod 5 and 6. Sternal gills absent on 1st pleonite;all other gills present. Abdominal side plates similar to S. clantoni but perhaps with a fewless setae. Pleopod 1, inner ramus about 30 percent longer thanpeduncle. Uropod 1: outer ramus about equal to inner ramus inlength, 60 to 65 percent as long as peduncle, armed with about 13spines; inner ramus

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