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Planalvus

Rhynchonellata - Athyridida - Athyrididae

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 Spirigerellinae by Williams et al. (2002); and to Spiriferida by Sepkoski (2002).

Synonymy list
YearName and author
1971Planalvus Carter pp. 248 - 249
2002Planalvus Sepkoski, Jr.
2002Planalvus Williams et al. p. 1540

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderAthyrididaBoucot et al. 1964
suborderAthyrididinaBoucot et al. 1964
superfamilyAthyridoideaMcCoy 1844
familyAthyrididaeMcCoy 1841
subfamilySpirigerellinae
genusPlanalvus

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.

Diagnosis
ReferenceDiagnosis
J. L. Carter 1971Longitudinally 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.