Rhynchonellata - Pentamerida - Porambonitidae

Alternative spelling: Equirostra

Synonym: Isorhynchus King 1850 [replaced name]

Parent taxon: Porambonites according to A. Williams et al. 2002

See also Cooper and Muir-Wood 1951 and Sepkoski 2002

Sister taxa: Porambonites (Isorhynchus), Porambonites (Noetlingia), Porambonites (Porambonites), Porambonites acutiplicatus, Porambonites costata, Porambonites intermedius, Porambonites planus, Porambonites reticulata, Porambonites trigona, Porambonites trigonus

Subtaxa: none

Ecology: stationary epifaunal suspension feeder

Distribution: found only at Composit List, Asker (Ordovician of Norway)

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