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Elasmatium

Bivalvia - Cyrtodontida - Dualinidae

Taxonomy
Elasmatium was named by Clarke (1904) [Sepkoski's age data: D Fras].

It was assigned to Bivalvia by Cox et al. (1969) and Sepkoski (2002); and to Loxopteriinae by Nagel-Myers et al. (2009).

Synonymy list
YearName and author
1904Elasmatium Clarke
1969Elasmatium Cox et al. p. N863
2002Elasmatium Sepkoski
2009Elasmatium Nagel-Myers et al. pp. 179 - 180

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
classBivalvia
Eubivalvia
subclassAutobranchia(Groblen 1894)
RankNameAuthor
infraclassPteriomorphia(Beurlen 1944)
OstreomorphiFerussac 1822
ArcioniGray 1854
orderCyrtodontidaScarlato and Starobogatov 1971
suborderPraecardiidina()
Antipleuroidei()
superfamilyDualinoideaConrath 1887
familyDualinidaeConrath 1887
subfamilyLoxopteriinae
genusElasmatiumClarke 1904

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.

G. †Elasmatium Clarke 1904
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Diagnosis
ReferenceDiagnosis
J. Nagel-Myers et al. 2009Strongly inequivalve. Umbo opisthogyrate to orthogyrate. LV circular in marginal outline; shell body conical, highly convex, with knob-like umbo; ornamentation of commarginal growth lines. RV lid-shaped, with strong commarginal rugae developed after knob-like umbo; commarginal growth lines fi ner, more closely spaced toward entral margin.