Tergomya - Cyrtonellida - Cyrtolitidae

Alternative combination: Cyrtolites (Cyrtolites) retrorsus

Synonyms: Cyrtolites fillmorensis Ulrich and Scofield 1897, Cyrtolites retrorsus fillmorensis Ulrich and Scofield 1897

Full reference: E. O. Ulrich and W. H. Scofield. 1897. The Lower Silurian Gastropoda of Minnesota. The Paleontology of Minnesota 39(2):813-1081

Belongs to Cyrtolites according to P. J. Wagner 2011

Sister taxa: Cyrtolites (Cyrtolites), Cyrtolites budleighensis, Cyrtolites claysferryensis, Cyrtolites craigensis, Cyrtolites dilatus, Cyrtolites disjunctus, Cyrtolites grandis, Cyrtolites hornyi, Cyrtolites inornatum, Cyrtolites inprobus, Cyrtolites insculptus, Cyrtolites nodosus, Cyrtolites occultus, Cyrtolites ornatus, Cyrtolites rugosus, Cyrtolites seminulum, Cyrtolites sinuosus, Cyrtolites thraivensis, Cyrtolites trentonensis, Cyrtolites tuboides, Cyrtolites undulatus

Ecology: slow-moving low-level epifaunal grazer