Classification
Phylum: Mollusca
Class: Gastropoda
Order: Euomphalina
Family: Holopeidae
Genus: Cyclora Hall, 1845
Cincinnatian Species: Cyclora depressa
Taxonomic Details
Synonyms: Cyclonema Knight, 1941 & Knight et al., 1960
Geologic Range
Late Ordovician
Common Paleoecology
Cyclora is an extinct genus of stationary epifaunal suspension feeders
Identification in Hand Sample:
- Minute umbilicus
- Circular aperture
- Smooth columella
- Thin, subglobular shell
- Short spire
- Few whorls
Geographic Occurrences
[leaflet-map lat=39 lng=-84.5 zoom=7 width=575 height=250 align="right"]Map point data provided by iDigBio.Published Description
Holland (UGA Strat Lab, 2013):
- Cyclora may be a junior synonym of Cyclonema as it may be the juvenile part of the shell
Treatise on Invertebrate Paleontology, Part I, Mollusca 1 (1960):
- Very minute, naticiform. [Probably based on steinkerns of protoconchs of some other genus, possibly Cyclonema; Locally very abundant]
Miller (1874) :
- Shell minute, smooth, consisting of few whorls; aperture circular. Prof. Meek suggests that this genus probably belongs to the family Rissoidae.
Hall (1845) :
- Subglobose, shell thin, spire short, consisting of a few whorls; columella smooth, slightly reflected over a minute umbilicus, aperture circular.