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Atkinsonella

Taxonomy
Atkinsonella was named by Jordan and Gilbert (1920) [Sepkoski's age data: T Ol]. Its type is Atkinsonella strigilis.

It was assigned to Actinopterygii by Jordan and Gilbert (1920); and to Neogastropoda by Sepkoski (2002).

Synonymy list
YearName and author
1920Atkinsonella Jordan and Gilbert p. 41
2002Atkinsonella Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
RankNameAuthor
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
superclassActinopterygii(Cope 1887)
genusAtkinsonella

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
D. S. Jordan and J. Z. Gilbert 1920Head about 4 in length to base of caudal ; depth about 4%. Ver- tebrae longer longer than deep, rather smooth, each mesially constricted and with two ridges and three grooves ; the number probably 24 ( 16 preserved). Neural spines moderate, directed upward and backward, the anterior more curved and directed more backward; ribs strong.
Dorsal fin nearly continuous, the rays about IX, 17, not certainly counted ; first part of 8 to 10 slender spines, the third longest somewhat more than depth of body ; the others progressively shorter ; soft rays long, and apparently all short ; pectoral fin rather short, acute ; the upper rays longest, about 3 times in depth of body. Ventrals inserted just be- hind them; the fin, if correctly interpreted, a little longer than the pec- torals and of about 8 slender rays. Unfortunately this very exceptional character is uncertain as the fin as preserved may be a misplaced fin, possibly a pectoral from the other side.