Calliotropis motutaraensis
From Wikipedia, the free encyclopedia
| Calliotropis motutaraensis Temporal range: | |
|---|---|
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| Holotype from Auckland War Memorial Museum | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Family: | Calliotropidae |
| Genus: | Calliotropis |
| Species: | †C. motutaraensis |
| Binomial name | |
| †Calliotropis motutaraensis A. W. B. Powell, 1935 | |
| Synonyms[1] | |
| |
Calliotropis motutaraensis is an extinct species of sea snail, a marine gastropod mollusc, in the family Calliotropidae.[1] Fossils of the species date to early Miocene strata of the west coast of the Auckland Region.
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In the original description, Powell described the species as follows:
Shell fairly large, thin, conical and widely umbilicate. Whorls 81⁄2, including a minute globular smooth protoconch of 11⁄2 whorls. First post-nuclear whorl of closely-spaced crisp axials. Sub-sequent whorls with two widely separated spiral rows of closely-spaced prominent spinose nodules. The distance between the spiral rows is slightly more than double the distance between either one of these spirals and the adjacent suture. There are 19 nodules in one spiral series on the last whorl, and 17 on the third post-nuclear. The body-whorl has a third spinose spiral proceeding from the suture, and four more on the base, the last of which borders a wide and deep funnel-shaped umbilicus, the maximum width of which is about one-third that of the base. The basal spirals have finer and much more numerous nodules. The surface of the upper whorls is smooth, but on the body-whorl there are close but somewhat irregular retractive axial growth lines, those on the base being somewhat stronger and more regular. Aperture rhomboidal. Peristome thin, discontinuous. Inner lip as a thin callosity over the parietal wall. Upper part of columella slightly reflected over the umbilical cavity.[2]
The holotype of the species measures 17 mm (0.67 in) in length and has a diameter of 18 mm (0.71 in).[2]
