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Craspedelia marginata

Strophomenata - Strophomenida - Bimuriidae

Craspedelia marginata was named by Cooper (1956). Its type specimen is USNM 117474b, a shell, and it is a 3D body fossil. Its type locality is 0.2 miles southeast of Pratt Ferry, which is in a Chazy open shallow subtidal limestone in the Pratt Ferry Formation of Alabama.

Synonymy list
YearName and author
1956Craspedelia marginata Cooper pp. 773 - 774 figs. Plate 213, A, figures 1-20
1962Craspedelia marginata Williams p. 178 figs. Pl. XVII, figs. 8-10, 14, 15
2014Craspedelia marginata Candela and Harper pp. Supplement 1p

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phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyPlectambonitoideaJones 1928
familyBimuriidaeCooper 1956

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. A. Cooper 1956Shell small, transverse with the hinge forming the widest part; cardinal extremities alate; lateral margins strongly oblique, gently convex; anterior margin broadly rounded. Surface smooth.

Pedicle valve strongly convex in lateral profile and with the maximum convexity at the umbo; anterior profile strongly humped in the middle with steep slopes to the depressed flanks. Median region narrowly swollen and much elevated above the narrow, gently convex flanks. Marginal deflection not strongly elevated. Region immediately posterior to deflected rim forming a narrow trough.

Brachial valve deeply concave in the median region; lateral extremities sulcate but shallow; anterior part bounding concave median area steeply deflected toward the margin of the brachial valve ; anterior margin deflected toward the pedicle valve, the deflected area attaining a length of more than I mm. Deflected margin enclosing the similar area in the pedicle valve.
A. Williams 1962Strongly concavo-convex Craspedelia with a broad median ventral fold and corresponding dorsal sulcus, outline semi-elliptical, widest at the hinge-line and more than one-half as long as wide, ventrally deflected flange to the shell well developed; surface smooth, pedicle sheath long; socket ridges subparallel with the hinge-line, brachial apparatus consisting of a median septum, strongly developed posteriorly, and a pair of submedian, narrowly divergent septa, flanked in mature specimens by a pair of fimbriated and elevated callosities comparable with a lophophore platform; ventral interior with small, unsupported teeth, muscle-scars not impressed but with a narrow median zone of strong tubercles.