Ribeiria

Ribeiria; Temporal range: Mid Cambrian–Silurian[1] PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	†Rostroconchia
Order:	†Ribeirioida
Genus:	†Ribeiria; Sharpe, 1853
Species
	R. junior Runnegar, 1996 ;

Ribeiria is a genus of rostroconch mollusc with a pegma, once interpreted as an intermediate between helcionellids (such as Anabarella and Latouchella) and primitive scaphopods (such as Pinnocaris).[2]

References

Woodward, Samuel Peckworth; Tate, Ralph (1868). A manual of the Mollusca: being a treatise on recent and fossil shells.
Peel, J. S. (1991). "Functional Morphology of the Class Helcionelloida Nov., and the Early Evolution of the Mollusca". In Simonetta, A. M.; Conway Morris, S (eds.). The Early Evolution of Metazoa and the Significance of Problematic Taxa. Cambridge University Press. pp. 157–177. ISBN 978-0-521-40242-2.

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[1] Woodward, Samuel Peckworth; Tate, Ralph (1868). A manual of the Mollusca: being a treatise on recent and fossil shells.

[2] Peel, J. S. (1991). "Functional Morphology of the Class Helcionelloida Nov., and the Early Evolution of the Mollusca". In Simonetta, A. M.; Conway Morris, S (eds.). The Early Evolution of Metazoa and the Significance of Problematic Taxa. Cambridge University Press. pp. 157–177. ISBN 978-0-521-40242-2.