File:Bulletin - United States National Museum (1967) (14597750499).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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given for the spinatusgroup, above. Largest male, 4.00 mm; largest female, 7.50 mm. Antenna 1 about 50 percent as long as body, 50 to 55 percentlonger than antenna 2; primary flagellum with up to 18 segments,the distal 7 or 8 segments rather elongate. Antenna 2, flagellumwith 6 segments. Mandibular palpal segment 3 moderately slender,with up to 7 long setae; palpal segment 2 with up to 6 setae. Maxilla1, inner plate with up to 5 apical, plumose setae. Maxilla 2, innerplate with up to 6 long, obliquely placed, plumose setae. Maxilliped:inner plate with 4 thick spines apically; outer plate reaching wellbeyond apex of 1st palpal segment. Lower lip, inner lobes vestigalor absent. Gnathopod 1: propod palmar margin oblique, slightly convex,armed with a double row of about 6 small spine teeth; posteriorangle and posterior margin continuous, with 4 large spines on outsideand no spines on inside; lateral setae few in number, singly inserted. 242-803—67 A 44 U.S. NATIONAL MUSEUM BULLETIN 259
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SUBTERRANEAN AMPHIPOD STYGONECTES 45 Gnathopod 2: propod palmar margin relatively straight, armed witha double row of 6 or 7 small spiiie teeth; posterior angle with 1 largespine on outside and 1 or 2 small spines on inside; posterior marginwith 3 sets of setae; lateral setae few in number, mostly doublyinserted; coxal plate about as broad as long, with 9 marginal setae.Coxal plate of pereopod 3 about as long as broad at base, narrowingdistally, with 5 setae and 3 spinules marginally. Coxal plate ofpereopod 4 about as long as broad, extending about 1/2 the lengthof segment 2, marginally with 10 or 11 setae. Pereopod 7 aboutequal in length to pereopod 6, 15 to 20 percent longer than pereopod5. Bases of pereopods 5-7 with rather well-developed distoposteriorlobes. Dactyls of pereopods 5-7 approximately 40 percent as longas corresponding propods. Coxal gills on pereopod 7 absent in bothsexes; sternal gills present on 1st pleonite of female, absent in male;all other gills present. Abdomin

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