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Planalvus
Taxonomy
Planalvus was named by Carter (1971) [Sepkoski's age data: C Tour C Vise-l Sepkoski's reference number: 897,1239].
It was assigned to Athyridinae by Carter (1971); to Spiriferida by Sepkoski (2002); and to Spirigerellinae by Williams et al. (2002).
It was assigned to Athyridinae by Carter (1971); to Spiriferida by Sepkoski (2002); and to Spirigerellinae by Williams et al. (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1971 | Planalvus Carter pp. 248 - 249 |
| 2002 | Planalvus Sepkoski |
| 2002 | Planalvus Williams et al. p. 1540 |
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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.
G. †Planalvus Carter 1971
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†Planalvus cailliaudi Barrois 1889
†Planalvus densa Hall and Clarke 1894
†Planalvus gibberosa Carter 1971
†Planalvus rufus Racheboeuf et al. 1994
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. L. Carter 1971 | Longitudinally to transversely ovate, small to medium size, unequally biconvex athyridids with weakly developed ventral sulcus and dorsal fold; pedicle valve thick-shelled, weakly convex, nearly flat posteriorly; ventral beak small, almost obsolete; beak ridges subangular, defining pseudoareas on either side of the delthyrium; pedicle foramen small, possibly obsolete in adults; dental plates lacking; surface lamellose, the lamellae being finely striated and apparently fringed with minute spines.
Brachial valve gibbous and much more inflated than the pedicle valve; dorsal beak angular, pointed, incurved, filling the delthyrium of the pedicle valve completely; cardinal plate large, athyridid, nonperforate, nearly filling the ventral umbo; brachidium unknown. |