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Dikenaspis
Taxonomy
Dikenaspis was named by Denison (1963) [Sepkoski's age data: S Prid Sepkoski's reference number: 1066]. Its type is Dikenaspis yukonensis.
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
D. yukonensis (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 moderately broad, the orbits are
placed relatively far back, the rostrum has a strong median lobe on its anterior margin, and the postbranchial lobes are deep and trun- cated anteriorly. The dentine ridges are fine. The dorsal shield is divided by the ridge pattern into rostral, central, and paired lateral epitega. The ridges are mostly transverse on the rostral epitegum, and converge at the midline anteriorly on the central epitegum and in the pineal area. The lateral line canals are branched in a complex fashion. There are two pairs of lateral lines on the rostrum. |