Spondylus chipolanus tampensis Mansfield, 1937
MANSFIELD, W. C. 1937. Mollusks of Tampa and Suwannee Limestiones of Florida. Florida Department of Conservation, State Geological Survey, Geological Bulletin, 15: 1-334, pls. 1-21. [p. 215]
1937 Spondylus chipolanus tampensis Mansfield, 1937
Spondylus bostrychites Guppy; W. H. Dall, 1915, A monograph of the molluscan fauna of the Orthaulax pugnax zone of the Oligocene of Tampa, Florida, plate 19, figure 4.
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«1915. Spondylus bostrychites Dall (not Guppy), U. S. Nat. Mus. Bull. 90, p. 124, pl. 19, fig. 4.
In 1915 Dall identified specimens from "silex beds" at Ballast Point, Tampa Bay, Fla., as Spondylus bostrichites Guppy. Two right valves are in the collection at the U. S. National Museum under the catalogue numbers 154247 and 165182, the latter figured by Dall [109]. These specimens are not perfect; the surfaces of the unbonal areas have been worn away and much of the surfaces of the disk is either corroded or covered with matrix.
Shell obliquely ovate, the lower posterior side being more produced; height greater than the length; strongly inflated. Beak produced. Hinge line short. Sculpture of moderately fine, closely spaced narrow ribs with shallow interspaces. The second or third rib is stronger then the others and bears upon its crest weak spines. Occasionally one or two fine scabrous threads lie near the spinose ribs. Whole surface is concentrically sculptured with moderately coarse lamellae. Dimensions: Holotype, right valve (U. S. National Museum no. 165182), Length, 47 mm.; height 59mm.; diameter 23 mm. Horizon: Tampa limestone, lower Miocene. Spondylus chipolanus tampensis differs, so far as can be observed, from S. chipolanus in having less strongly developed primary ribs; fewer, more closely spaced, and coarser radials between the primary ribs; and stronger concentric lamellae. Compared with S. bostrychites Guppy, S. chipolanus tampensis has a much narrower hinge-line, weaker ribs with narrower interspaces, fewer ribs bearing spines, and apparently lacks numerous fine spinose radials. The specimen figured by Dall [110] came from the Chipola River and is the holotype of S. chipolanus Dall. Occurrence: "silex beds" of the Tampa limestone, Tampa Bay; station 2470, 1 mile west of Bartow, Polk County Fla.» 109. Dall, W. H., U. S. Nat. Mus. Bull. 90, pl. 19, fig. 4, 1915.
110. Dall, W. H., U. S. Nat. Museum Bull. 90, pl. 19, fig. 1, 1915. WENDELL CLAY MANSFIELD, 1937
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