Gastropoda - Epitonioidea - Epitoniidae

Alternative combinations: Epitonium (Confusiscala) mathewsonii, Opalia (Confusiscala) mathewsonii, Scalaria (Opalia) mathewsonii

Full reference: W. M. Gabb. 1864. Description of the Cretaceous fossils. Geological Survey of California Palaeontology 1:57-217

Belongs to Opalia according to R. L. Squires and L. R. Saul 2003

See also Durham 1937, Gabb 1864 and Stewart 1927

Sister taxa: Epitonium (Opalia) retiporosum, Opalia (Contemniscala), Opalia (Crassiscala), Opalia (Dentiscala), Opalia (Granuliscala), Opalia (Nodiscala), Opalia (Opalia), Opalia (Pliciscala), Opalia (Rugatiscala), Opalia atra, Opalia borealis, Opalia cavea, Opalia crenatoides, Opalia insculpta, Opalia montereyensis, Opalia varicostata, Scala (Opalia) calvertensis, Scala (Opalia) prunicola, Scala (Opalia) reticulata

Type specimen: ANSP 4220.

Ecology: slow-moving low-level epifaunal carnivore

Distribution: found only at CIT loc. 1158, Bell Canyon (Cretaceous of California)

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Specimen images are retrieved through the ePANDDA API.