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In Raymond (1916), Conocardium, Genus was named after Brongniart but no time is given.
It was assigned to Rostroconchia by Pojeta et al. (1972); to Conocardioida by Sepkoski (2002); and to Conocardiidae by Miller (1889), Raymond (1916), Isberg (1934) and Bouchet et al. (2010).
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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.