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Stenolaemata - Cyclostomata - Plagioeciidae
Hyporosopora is extinct according to Treatise (Bassler, et al. 1953: G54 lists as "Jur.") and not included as an extant genus in WoRMS.
It was assigned to Cyclostomata by Sepkoski (2002); and to Plagioeciidae by Hara and Taylor (2009), Zaton and Taylor (2010), Zaton et al. (2013), Di Martino and Taylor (2013) and Wilson et al. (2015).
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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.