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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.
|M. Mergl 2012||Orbiculoidea concentrica (WAHLENBERG, 1818) described from the Dalmanitina Beds (Hirnantian) of Wästergötland, Sweden by Bergström (1968) differs from A. squamosus by a longer pedicle track, coarser rugellate ornamentation and a larger shell size.|