Family Trimusculidae Burch 1945 (button snail)

Gastropoda - Heterostropha - Trimusculidae

Parent taxon: Ellobioidea according to P. Bouchet et al. 2017

See also Abbott 1974 and Bouchet et al. 2005

Sister taxa: Carychiidae, Ellobiidae

Subtaxa: Trimusculus

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Type: Trimusculus

Ecology: facultatively mobile low-level epifaunal grazer


• Quaternary of Angola (1 collection), Ecuador (1), Mexico (7), South Africa (1), United States (13: California)

• Pliocene of the Dominican Republic (1)

• Oligocene of Canada (2: British Columbia)

Total: 26 collections each including a single occurrence

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