Ringicula marwicki
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| Ringicula marwicki Temporal range: | |
|---|---|
 | |
| Holotype from Auckland War Memorial Museum | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Superorder: | Ringiculimorpha |
| Family: | Ringiculidae |
| Genus: | Ringicula |
| Species: | †R. marwicki |
| Binomial name | |
| †Ringicula marwicki A. W. B. Powell, 1935 | |
Ringicula marwicki is an extinct species of sea snail, a marine gastropod mollusc, in the family Ringiculidae.[1][2] Fossils of the species date to early Miocene strata of the west coast of the Auckland Region, New Zealand.
In the original description, Powell described the species as follows:
Shell small, ovate, solid. Body-whorl inflated. Spire narrowly conical, about two-thirds height of aperture. Whorls 41⁄2, including a small, smooth, dome-shaped protoconch of about 11⁄2 whorls, the tip flattened and slightly tilted. Suture impressed and bordered below by a fairly strong groove. Spire whorls smooth, body-whorl sculptured with about 16 incised lines, five of them being between the sutures. Outer lip broken away below, but, by the remaining upper portion, it is shown to be strongly variced. Parietal wall with a strong fold and two more, equally strong, on the columella.[3]
The holotype of the species measures 3 mm (0.12 in) in height and 2 mm (0.079 in) in diameter.[3] The species is morphologically similar to R. torquata, but can be identified due to R. marwicki being smaller, having a less broadly conic spire and stronger subsutural border.[3]
