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Craspedelia marginata
Taxonomy
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 Chazyan open shallow subtidal limestone in the Pratt Ferry Formation of Alabama.
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Craspedelia marginata Cooper pp. 773 - 774 figs. Plate 213, A, figures 1-20 |
| 1962 | Craspedelia marginata Williams p. 178 figs. Pl. XVII, figs. 8-10, 14, 15 |
| 2014 | Craspedelia marginata Candela and Harper pp. Supplement 1p |
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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.
†Craspedelia marginata Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell 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 1962 | Strongly 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. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Age range: Llandeilo or 461.10000 to 458.40000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chazyan | USA (Alabama) | Craspedelia marginata (type locality: 162364) | |
| Llandeilo | United Kingdom (Scotland) | Craspedelia marginata (164931 164937) |