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Taxonomy
Keenaea was named by Habe (1951) [Sepkoski's age data: T Ol-l R]. It is extant.
It was reranked as Nemocardium (Keenaea) by Moore (1976), Schneider (1995), Coan et al. (2000) and Moore (2003).
It was assigned to Protocardiinae by Vokes (1980); to Veneroida by Sepkoski (2002); and to Nemocardium by Moore (1976), Schneider (1995), Coan et al. (2000) and Moore (2003).
It was reranked as Nemocardium (Keenaea) by Moore (1976), Schneider (1995), Coan et al. (2000) and Moore (2003).
It was assigned to Protocardiinae by Vokes (1980); to Veneroida by Sepkoski (2002); and to Nemocardium by Moore (1976), Schneider (1995), Coan et al. (2000) and Moore (2003).
Species lacking formal opinion data
Synonymy list
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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.
Subg. Nemocardium (Keenaea) Habe 1951
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Nemocardium (Keenaea) centifilosum Carpenter 1864
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Invalid names: Cardium richardsoni Whiteaves 1878 [synonym]
Diagnosis
No diagnoses are available