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Ptomaspis
Taxonomy
Ptomaspis was named by Denison (1963) [Sepkoski's age data: S Wenl S Ludl]. Its type is Ptomaspis canadensis.
It was assigned to Cyathaspidae by Denison (1963); and to Pteraspidomorphes by Sepkoski (2002).
It was assigned to Cyathaspidae by Denison (1963); and to Pteraspidomorphes by Sepkoski (2002).
Species
P. canadensis (type species)
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. H. Denison 1963 | The dorsal shield is of moderate proportions; its orbital notches are shallow, its rostrum is smoothly rounded, and its posterior margin is gently convex. The dentine ridges include some that are slightly higher between others that are lower and sometimes slightly narrower; they are subdivided into short lengths or even into small denticles. Posteriorly the ridges are grouped into scale-like areas. Thedorsalshieldisdividedbythepatternofornamentation into epitega: the rostral epitegum has short transverse ridges anteriorly, and grades through a denticulate area into antero-posterior ridges in the pineal triangle; the central epitegum has a slightly elliptical pattern. |
Measurements
No measurements are available
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| Source: subp = subphylum, p = phylum | |||||
| Reference: Kiessling 2004 | |||||