Rostroconchia - Ribeirioida - Ribeiriidae

Full reference: R. Etheridge, Jr. 1878. Notes on a few Silurian fossils from the neighborhood of Girvan, Ayrshire. Proceedings of the Royal Physcians Society of Edingburgh 4:167-177

Parent taxon: Ribeiriidae according to J. Pojeta and B. Runnegar 1976

Sister taxa: Apoptopegma, Cymatopegma, Oepikila, Ptychopegma, Ribeiria, Ribeirina, Wanwania

Subtaxa: Pinnocaris americana, Pinnocaris curvata, Pinnocaris lapworthi, Pinnocaris lembodes, Pinnocaris robusta, Pinnocaris wellsi

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Type: Pinnocaris lapworthi

Ecology: stationary semi-infaunal suspension feeder