Nerineidae

The Nerineidae is an extinct taxonomic family of fossil sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia.

[1] Genera within the family Nerineidae include:

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Bactroptyxis trachaea , Aubry-en-exmes, Normandy, France; Middle Jurassic (Bathonian). Close-up view of interior.