Biology:Etrema gippslandensis
| Etrema gippslandensis | |
|---|---|
| File:Etrema gippslandensis MA70966-a.jpg | |
| Holotype from Auckland War Memorial Museum | |
Scientific classification 
| |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Neogastropoda |
| Family: | Clathurellidae |
| Genus: | Etrema |
| Species: | †E. gippslandensis
|
| Binomial name | |
| †Etrema gippslandensis A. W. B. Powell, 1944
| |
Etrema gippslandensis is an extinct species of sea snail, a marine gastropod mollusc, in the family Pseudomelatomidae.[1] Fossils of the species date to late Miocene strata of the Gippsland Basin of Victoria, Australia.
Description
In the original description, Powell described the species as follows:
Resembles bidens, but much larger; differing in the protoconch, having a less angulate second whorl, obsolete shoulder spirals, and absence of granules on the basal spirals. Whorls angled at two-thirds whorl height. Shoulder almost flat, gently descending. Primary spirals 4 on spire-whorls, 15 on body-whorl, with 1-3 weak secondary lirae in interspaces. Axials broadly rounded folds, 15 per whorl, fading out on shoulder and base. Sinus deep. Parietal tubercle strong, a few irregular minute tubercles on lower half of pillar. Inner lip thin at edge, strengthened behind by a heavy varix; very faint lirations within.[2]
The holotype of the species measures 20.5 mm (0.81 in) in height and has a diameter of 9.75 mm (0.384 in).[2] It can be distinguished from E. mirabilis due to E. gippslandensis having a slight angulation on the last whorl of the shell.[2]
Taxonomy
The species was first described by A. W. B. Powell in 1944.[2] The holotype was collected at an unknown date prior to 1944 from the Gippsland Lakes area in Victoria, Australia, and is held by the Auckland War Memorial Museum.[3][4]
Distribution
This extinct marine species occurs in late Miocene strata of the Gippsland Basin of Victoria, Australia, including the Jemmys Point Formation,[3][5] and the Bunga Creek bed.[6]
Gallery
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Reverse view of holotype
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Side view of holotype
References
- ↑ Etrema gippslandensis A. W. B. Powell, 1944 †. Retrieved through: World Register of Marine Species on 19 February 2026.
- ↑ 2.0 2.1 2.2 2.3 , Wikidata Q58676624
This article incorporates text from this source, which is under a CC BY 4.0 license.
- ↑ 3.0 3.1 , Wikidata Q135397912
- ↑ "Etrema gippslandensis". Auckland War Memorial Museum. https://www.aucklandmuseum.com/discover/collections/record/229956.
- ↑ , Wikidata Q136396722
- ↑ Wilkins, R. W. T. (1963). "Relationships between the Mitchellian, Cheltenhamian and Kalimnan Stages in the Australian Tertiary". Proceedings of the Royal Society of Victoria. New Series 76 (1): 58. https://www.biodiversitylibrary.org/page/56815795.
Wikidata ☰ Q138339930 entry
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