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Gastropoda - Murchisoniina - Hormotomidae
It was corrected as Coelocaeulus by Ulrich and Scofield (1897); it was reranked as Murchisonia (Coelocaulus) by Perner (1907); it was synonymized subjectively with Michelia by Knight et al. (1960).
It was assigned to Pleurotomariidae by Ulrich and Scofield (1897); to Murchisonia by Perner (1907); to Archaeogastropoda by Sepkoski (2002); to Murchisoniidae by Rohr et al. (2003); and to Hormotomidae by Wagner (2017).
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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.