Spondylus filiaris Dall, 1916
DALL, W. H. 1916. A contribution to the invertebrate fauna of the Oligocene beds of Flint River, Georgia. Proceedings of the United States National Museum, 51: 487-524, pls. 83-88. [p. 493, pl. 83, figs. 5, 6]
1916 Spondylus filiaris Dall, 1916
W. H. Dall, 1916, plate 83.
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«Shell large, thin, more or less irregular from its attachment to irregular surfaces which its growth follows, sculptured with small low radiating rounded threads without spiny processes, arranged m groups of five to eight, with the interspaces averaging subequal; these groups separated by larger but similar smgle tlireads; the inner margm of the valves shghtly crenulated; concentric sculpture of inconspicuous incremental lines; beak of upper valve rather pointed, with a small and narrow inconspicuous auricle on each side, the lower valve not obtained; the hinge as usual m the genus, but narrow with a small resilifer. Height of large upper valve, approximately, 65; breadth, 57; depth, 18 mm. The small valve figured is about 20 mm. in height.
Locality.— Station 7078, on the east bank of Flint River, near the lower end of Smith's Reach, about one-quarter of a mile below Hale Landing, Decatur County, Georgia; collected by Dr. C. Wythe Cooke and W. C. Mansfield, 1914. Also with Spondylus bostrychites Guppy, in the Tampa silex beds at Ballast Pomt, Tampa Bay, Florida, by W. H. Dall in 1886. U. S. Nat. Mus. Cat. No. 166712. This species is represented by a defective specimen in the Tampa collection wliich was supposed, when studied, to be a worn variant of S. bostrychites. But the more complete material obtained on the Flint River shows that its sculpture does not take on the spinose character of the latter species and the sculpture is finer and more regular. Between perfect shells the distinctiveness should be complete.» WILLIAM HEALEY DALL, 1916
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«Discussion: The syntypes of the species are incomplete casts from the Flint River Formation in Georgia (see Plate 58, figures 11-12). Specimens with much better preservation occur in the Mint Spring Formation along the Chickasawhay River in Wayne County, Mississippi (Plate 15, figures 1-3). This species is characterized by radial lirae and the lack of prominent spines. Strong concentric laminae are developed
in some variations (see Plate 58, figures 7-8). These laminae probably served the same function of anchoring the right valve to the substrate as do spines in other species. Type: Two syntypes A-B 166712 USNM from the Flint River Formation, Flint River, Decatur County, Georgia.
Occurrence: Mississippi: Forest Hill Formation, localities 75a, 88a; Mint Spring Formation, localities 74b, 75b, 117b; Byram Formation, locality 93. Georgia: Flint River Formation, Decatur County.»
DOCKERY III, D. T. 1982. Lower Oligocene bivalvia of the Vicksburg Group in Mississippi. Mississippi Department of Natural Resources, Bureau of Geology, Bulletin, 123: 1-261, pls. 1-62, text-figs. 1-48, appendix of 15 plates. [p. 50-51]
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Spondylus (Spondylus) filiaris Dall, 1916; D. T. Dockery III, 1982, Lower Oligocene bivalvia of the Vicksburg Group in Mississippi, plate 15, figures 1, 3, 6, 7; plate 58, figures 7, 8, 11, 12.
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