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Ptomaspis canadensis

Pteraspidomorpha - Cyathaspidiformes - Cyathaspididae

Taxonomy
Ptomaspis canadensis was named by Denison (1963). Its type specimen is PU 17090, a partial skeleton, and it is a 3D body fossil. Its type locality is Beaver River, which is in a Silurian marine dolomite in Canada. It is the type species of Ptomaspis.

Synonymy list
YearName and author
1963Ptomaspis canadensis Denison p. 110

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumCraniata
superclassPteraspidomorphi(Goodrich 1909)
RankNameAuthor
classPteraspidomorpha
subclassHeterostraciLankester 1868
orderCyathaspidiformes(Kaier 1930)
suborderCyathaspidoidei
familyCyathaspididaeFlower and Wayland-Smith 1952
genusPtomaspis
speciescanadensis

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
R. H. Denison 1963The length of the dorsal shield is 61 mm.; the ratio of width to length is .58. Dentine ridges average about 5 per millimeter.