Tergomya - Cyrtonellida - Cyrtonellidae
Synonym: Isospiridae Wängberg-Eriksson 1964
Full reference: J. B. Knight and E. L. Yochelson. 1958. A reconsideration of the Monoplacophora and the primitive Gastropoda. Proceedings of the Malacological Society of London 33(1):37-48
Parent taxon: Cyrtonellacea according to G.P. Wahlman 1992
See also Bouchet et al. 2005, Knight and Yochelson 1960, Ponder and Warén 1988, Starobogatov 1970 and Wagner 2023
Sister taxa: Cyclocyrtonellidae, Multifariidae
Subtaxa: Cyrtonella Isospira
Ecology: slow-moving low-level epifaunal grazer
Distribution:
• Devonian of United States (9: New York collections)
• Silurian of the Czech Republic (1)
• Ordovician of Estonia (2), Sweden (1), the United Kingdom (1), United States (2: Tennessee, Virginia)
Total: 16 collections each including a single occurrence