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Homalaspidella borealis

Pteraspidomorpha - Cyathaspidida

Taxonomy
Homalaspidella borealis was named by Denison (1963). Its type specimen is PU 17101, 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.

Synonymy list
YearName and author
1963Homalaspidella borealis Denison p. 117

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumCraniata
RankNameAuthor
superclassPteraspidomorphi(Goodrich 1909)
classPteraspidomorpha
subclassHeterostraciLankester 1868
orderCyathaspididaKaier 1930
genusHomalaspidellaStrand 1934
speciesborealis

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 dorsal shield has a length of 28 to 30 mm., and
a ratio of width/length of .54. The rostral edge is nearly transverse.
The preorbital processes and orbital notches are very slightly developed, and the orbits are far anterior. The ratio of postbranchial length to total length is .33-.37. The posterior edge of the dorsal shield is gently convex and lacks a median lobe. The dentine ridges are moderately coarse, 5.2-6.2 per millimeter on the dorsal shield, and 5.0-5.4 per millimeter on the ventral shield.