File:Bulletin - United States National Museum (1967) (14597707380).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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teriorlobe distally. Gill arrangement complete. Abdominal side plates corresponding to those described for thepizzinii group. Pleopod 1, peduncle with 4 or 5 lateral setae onouter margin. Uropods 1 and 2 as noted for the pizzinii groupand as shown m figure 11. Uropod 3, ramus about 50 percent aslong as peduncle, armed apically with 2 long spines and 1 short spine.Telson approximately 50 percent longer than broad, lateral marginswith 1 or 2 spines each, apex convex and armed with 8 unequal spines. Female.—Differing from the male as follows: Antenna 1, primaryflagellum with up to 19 segments. Antenna 2, flagellum with 11segments. Gnathopod 1: propod palmar margin straight, obhque,armed with a double row of 7 or 8 small spine teeth; posterior anglewith 2 large and 2 small spines on outside, 3 small spines on inside;posterior margin with 3 sets of setae; claw of dactyl long. Gnatho-pod 2 about like that of male but with a few less spines on posterior 54 U.S. NATIONAL MUSEUM BULLETIN 259
Text Appearing After Image:
Figure 11.—Stygonedes itidentatus, new species. Male (9.75 mm), outlet of drain, 3 milesNW of Suffolk, Va.: a,b, gnathopods 1,2; c,d, antennae 1,2; e, coxal plate of pereopod 3;f-i, pereopods 4,5,6,7;/, pleopod 1; k, abdominal side plates; l-n, uropods 1,2,3; o, telson.Female (7.50 mm), same locality: p, gnathopod 1; q,r, pereopods 5,7; s, telson; t, uropod3. SUBTERRANEAN AMPHIPOD STYGONECTES 55 angle of propod. Segment 4 of pereopod 6 and basis of pereopod 7normal. Uropod 3, ramus only about 30 to 35 percent as long aspeduncle and armed apically with 2 large spines and 1 small spine.Telson just slightly longer than broad, armed laterally with 2 spinesper side and apically with 10 unequal spines. Variation.—Male secondary sex characters, i.e., propod palmarmargin notch, expanded foiuth segment of pereopod 6, and ventrallyproduced distal lobes of pereopod 7, did not appear to be completelydeveloped in animals less than 7.50 to 8.00 mm in length. Type locality.—Outlet of drain, 3

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