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Elasmatium
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).
It was assigned to Bivalvia by Cox et al. (1969) and Sepkoski (2002); and to Loxopteriinae by Nagel-Myers et al. (2009).
Synonymy list
Year | Name and author |
---|---|
1904 | Elasmatium Clarke |
1969 | Elasmatium Cox et al. p. N863 |
2002 | Elasmatium Sepkoski |
2009 | Elasmatium Nagel-Myers et al. pp. 179 - 180 |
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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.
G. †Elasmatium Clarke 1904
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Diagnosis
Reference | Diagnosis | |
---|---|---|
J. Nagel-Myers et al. 2009 | Strongly 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. |