Rhynchonellata - Pentamerida - Porambonitidae
Full reference: N. Spjeldnaes. 1957. The Middle Ordovician of the Oslo Region, Norway 9. Brachiopods of the family Porambonitidae. Norsk Geologisk Tidsskrift 215-228
Parent taxon: Porambonites according to N. Spjeldnaes 1957
Sister taxa: Porambonites (Equirostra), Porambonites (Noetlingia), Porambonites (Porambonites), Porambonites acutiplicatus, Porambonites costata, Porambonites intermedius, Porambonites planus, Porambonites reticulata, Porambonites trigona, Porambonites trigonus
Subtaxa: Porambonites (Isorhynchus) baueri Porambonites (Isorhynchus) schmidti
Ecology: stationary epifaunal suspension feeder
Distribution:
• Ordovician of Estonia (1 collection), Latvia (1), Lithuania (2), Norway (3), the Russian Federation (2)
Total: 9 collections each including a single occurrence