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Lunulacardium

Bivalvia - Myalinida - Lunulacardiidae

Synonymy list
YearName and author
1840Lunulacardium Münster
1885Lunulicardium Hall p. 435
1975Lunulacardium Nye et al. p. 293
2002Lunulacardium Sepkoski, Jr.
2007Lunulacardium Nagel-Myers and Amler pp. 52 - 53

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
classBivalvia
Eubivalvia
RankNameAuthor
subclassAutobranchia(Groblen 1894)
infraclassPteriomorphia(Beurlen 1944)
OstreomorphiFerussac 1822
OstreioniFerussac 1822
MyalinataPaul 1939
orderMyalinidaPaul 1939
superfamilyAmbonychioidea(Miller 1877)
familyLunulacardiidaeFischer 1887
genusLunulacardium

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
J. Nagel-Myers and M. R. W. Amler 2007Rounded to transversely oval in outline, subcircular ventral margin merging regularly into roundly bent anterior and posterior margins. Posterior part of hinge line straight, anterior straight to slightly convex. Umbo small, central, pointed, opisthogyrate to orthogyrate, main portion often cut off by truncation. Juvenile shell veneriform, turned anticlockwise by 90° compared to orientation of adult shell-body, not affected by truncation. Posterior truncation straight to slightly concave, cutting umbo and dorsal margin. Development, length and angle of truncation variable. Narrow, elongated groove running parallel to anterior portion of hinge-line, developing few parallel corrugations. Truncation creating posterodorsal edge, its declining portion developing irregular corrugate ornamentation more or less parallel to upper ridge of carina. Ornamentation consisting of strong and fi ne irregular radial ribs, fi ne comarginal growth lines, strong comarginal rugae. Internal characters unknown.