Phylum: Mollusca
Class: Tergomya
Order: Cyrtonellida
Family: Cyrtolitidae (Miller, 1889)
Cincinnatian Genera: Cyrtolites

Geologic Range
Late Cambrian – Early Silurian

Common Paleoecology
Cyrtolitidae is an extinct family of slow-moving low-level epifaunal grazers

Description of the Family

  • Anal emargination a shallow sinus
  • Commonly angular but without slit or selenizone
  • Generally open coiling especially in adult whorls
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Treatise on Invertebrate Paleontology, Part I, Vol. 1 (1960):

  • Anal emargination a shallow sinus, commonly angular but without slit or selenizone; coiling generally open, especially in adult whorls.

Ulrich & Scofield (1897):

  • Symmetrical involute shells; volutions two or three, barely in contact, sharply angular dorsally; aperture not expanded, the sinus V-shaped, never deep, sometimes wanting; no slit, and the bands occurs only in Cyrtolitina; surface reticulate.

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