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Isorthis (Arcualla)
Taxonomy
Arcualla was named by Walmsley and Boucot (1975). Its type is Orthis (Dalmanella) arcuaria.
It was reranked as Isorthis (Arcualla) by Williams et al. (2000).
It was assigned to Isorthis by Williams et al. (2000); and to Orthida by Sepkoski (2002).
It was reranked as Isorthis (Arcualla) by Williams et al. (2000).
It was assigned to Isorthis by Williams et al. (2000); and to Orthida by Sepkoski (2002).
Species lacking formal opinion data