Cyclora depressa

Classification
Phylum: Mollusca
Class: Gastropoda
Order: Euomphalina
Family: Holopeidae
Genus: Cyclora
Species: Cyclora depressa Ulrich, 1879

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1879 Cyclora depressa Ulrich, Jour. Cincinnati Soc. Nat. Hist., 2, p. 13, pl. 7, figs. 9, 9a.

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Stratigraphic Occurrences

Geographic Occurrences

Map point data provided by iDigBio.

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Sequences (Formations)

C6 Sequence (Elkhorn)
C5 Sequence (Lower Whitewater, Liberty, Waynesville)
C4 Sequence (Arnheim)
C3 Sequence (Mount Auburn, Corryville)
C2 Sequence (Bellevue, Fairview: Fairmount, Mount Hope)
C1 Sequence (Clays Ferry/Kope: McMicken, Southgate, Economy/Fulton)

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Identification in Hand Sample

Depressed spire
Two to three volutions
Angular whorls
Aperture rhombic oval
Sub-lenticular shell twice as wide as high

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Ulrich (1879):

Shell very small, sub-lenticular, about twice as wide as high; spire much depressed; volutions two or three, angular a little below the middle, increasing moderately in size, and with barely perceptible convexity on the upper side; sutures deeply impressed; umbilicus large; aperture rhombic oval; surface smooth.
Height of a specimen of the usual size, 0.02 inch; breadth, 0.04 inch. This species differs from both C. minuta and C. parvula, Hall, in having a larger umbilicus, the spire much more depressed, and the whorls angular instead of rounded.

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