Phylum: Mollusca
Class: Tergomya (Evans & Cope, 2003)
Cincinnatian Orders: Cyrtonellida

Taxonomic Details

Synonyms: Referred to as Monoplacophora until 2003
Common Name: Commonly referred to as Monoplacophora

Geologic Range
Early Cambrian – Recent

Common Paleoecology
Monoplacophora is an extant class of epifaunal grazers

Characteristics of the Class

  • Single shelled mollusks
  • Cap or spoon shaped to arched
  • Bilateral symmetry present in some
  • Some longitudinally curved and asymmetrical

Published Descriptions

Treatise on Invertebrate Paleontology, Part I, Vol. 1 (1960):

  • Mollusks with a single shell, cap-shaped, or spoon-shaped to arched, in some groups bilaterally symmetrical, in others longitudinally curved and deviating from symmetry.