Tergomya - Cyrtonellida - Cyrtonellidae

Full reference: J. Hall. 1879. Containing descriptions of the Gasteropoda, Pteropoda, and Cephalopoda of the Upper Helderberg, Hamilton, Portage, and Chemung Groups. Natural History of New York, Paleontology 5(2):1-492

Parent taxon: Cyrtonellidae according to P. J. Wagner 2011

Sister taxon: Isospira

Subtaxa: Cyrtonella expansus, Cyrtonella mitella, Cyrtonella pileolus

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Ecology: slow-moving low-level epifaunal grazer