Rhynchonellata - Pentamerida - Pentameridae

Unclear what the proper authority of the subgenus is. Boucot and Johnson (1979) created subgenera R. (Ectorhipidium) and R. (Pararhipidium), implying the creation of a nominal subgenus for other species.

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Parent taxon: Rhipidium according to Boucot and Johnson 1979

Sister taxa: Rhipidium (Ectorhipidium), Rhipidium (Pararhipidium), Rhipidium tenuistriatum

Subtaxa: Rhipidium (Rhipidium) knappi

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Type: Pentamerus knappi

Ecology: stationary epifaunal suspension feeder

Distribution: found only at Rhipidium Community, upper Scotch Grove Formation, Jackson County, Iowa (Silurian of Iowa)

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