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Actinodonta

Bivalvia - Grammysiidae

Taxonomy
Actinodonta was named by Philipps (1848) [Sepkoski's age data: O Aren-l S Ludl-l Sepkoski's reference number: 91,1066,1077].

It was assigned to Cycloconchidae by Cox et al. (1969); and to Modiomorphoida by Sepkoski (2002).

Synonyms
Synonymy list
YearName and author
1848Actinodonta Philipps p. 225
1873Davidia Hicks p. 49
1969Actinodonta Cox et al. p. N399
1969Davidia Cox et al. p. N820
2002Actinodonta Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
classBivalvia
Eubivalvia
RankNameAuthor
subclassAutobranchia(Groblen 1894)
infraclassHeteroconchia(Cox 1960)
CardiomorphiFerussac 1822
CardioniFerussac 1822
CardiidiaFerussac 1822
superfamilyGrammysioideaMiller 1877
familyGrammysiidaeMiller 1877
genusActinodontaPhilipps 1848

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
H. Hicks 1873 (Davidia)Ovate, umbo subcentral, nearer anterior extremity, both extremities
nearly equal in width. Surface of shell raised, and almost ridged
between umbo and each end near the cardinal margin. Hinge-line
more or less straight, about a third of the length of the shell, and
extending equally on each side of the umbo. Lines of growth
strongly marked.

The subcentral umbo, equal extremities, and almost triangular
shape of the shell are important characters, and sufficient to stamp
it a new genus.