. Bulletin - United States National Museum. ssissippian sedimentary rocks of largelysandstone and shale facies. Distribution and ecology.—This species is known only fromits type locality and ^drtually nothing is known about its distri-bution and ecology. Remarks.—Although Hubricht and Mackin (1940) referred to theRich Mountain collection as a distinctive lot, they failed to recog-nize this material as a separate species. There appears to be nogood reason, however, why this material should not be consideredspecifically distinct. Stygonectes elatus, new species Figure 20 Synpleonia dantoni Greas
. Bulletin - United States National Museum. ssissippian sedimentary rocks of largelysandstone and shale facies. Distribution and ecology.—This species is known only fromits type locality and ^drtually nothing is known about its distri-bution and ecology. Remarks.—Although Hubricht and Mackin (1940) referred to theRich Mountain collection as a distinctive lot, they failed to recog-nize this material as a separate species. There appears to be nogood reason, however, why this material should not be consideredspecifically distinct. Stygonectes elatus, new species Figure 20 Synpleonia dantoni Greaser.—Hubricht, 1943, p. 711 (in part). Material examined ARKANSAS.—Logan Co.: seep, mUe E of The Lodge, Magazine Mt., femaleholotype, male allotype, 2 female paratypes, L. Hubricht, May 4, 1940 (USNM) Diagnosis.—Distinguished from S. montanus, which it closelyresembles in several important aspects, by having several slenderventral spines on peduncular segment 4 of antenna 2, straight propod SUBTERRANEAN AMPHIPOD STYGONECTES 85. Figure 20.—Stygonedes elatus, new species. Female ( mm), seep on Magazine Mt.,Ark.: a,b, gnathopods 1,2; c, coxal plate of pereopod 3; d-g, pereopods 4,5,6,7; h, uropod3; i,j, antennae 1,2; k, abdominal side plates; /, telson; m,n, uropods 1,2. Male allotype( mm), same locality: o, uropod 3; p, telson. 86 NATIONAL MUSEUM BULLETIN 2 59 palmar margin of gnathopod 1, slightly convex propod palmar mar-gin of gnathopod 2, larger number of spine teeth on palms of bothgnathopodal propods, proportionately shorter outer ramus of uropod2, less elongate telson of male, and more apically spinose telson offemale. Largest male, mm; largest females, mm. Female.—Antenna 1 up to 65 percent as long as body and 50 per-cent longer than antenna 2; primary flagellum with up to 29 segments;accessory flagellum a little longer than primary flagellar segment 2: ventral margin of 4th peduncular segment with a fewslender spines; fla
Size: 1271px × 1965px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
