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Cardita unica

Bivalvia - Carditida - Carditidae

Taxonomy
Cardita unica was named by Kensley and Pether (1986). Its type specimen is SAM-PQ-KN566, a shell, and it is a 3D body fossil. Its type locality is Koingnaas 30m Complex, which is in a Pleistocene transition zone/lower shoreface horizon in South Africa.

Synonymy list
YearName and author
1986Cardita unica Kensley and Pether p. 204 fig. 37

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
classBivalvia
Eubivalvia
RankNameAuthor
subclassAutobranchia(Groblen 1894)
infraclassHeteroconchia(Cox 1960)
CardiomorphiFerussac 1822
CarditioniDall 1889
orderCarditida(Dall 1889)
superfamilyCrassatelloidea(Férussac 1822)
familyCarditidaeFleming 1820
genusCarditaBruguière 1792
speciesunica

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
B. Kensley and J. Pether 1986Shell robust, thick, oblong, anterior margin rounded, ventral margin flattened, posterior margin more pointed than anterior. External sculpture consisting of 27 radiating ribs, becoming broadly flattened near ventral margin, separated by narrow grooves; ribs on posterior part of shell narrower than on rest of shell. Concentric growth lines irregular, wavy. Lower anterior and posterior margin and ventral margin on shell interior crenulate, crenulations largest at posteroventral corner. Anterior adductor scar oval; small circular hollow dorsal to anterior muscle scar, hidden under anterior hinge line. Posterior adductor scar anteriorly truncate, posteriorly rounded. Hinge line broad, solid; anterior lateral tooth almost vertical, short, separated from anterior cardinal tooth by triangular pit; anterior cardinal tooth acutely triangular with posterior margin twice length of anterior margin, separated from posterior cardinal tooth by narrowly triangular oblique groove; posterior cardinal tooth elongate, with horizontal dorsal part and oblique ventral part. Ventral margin of hinge area sinuous.