Etrema mirabilis

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Etrema mirabilis
Temporal range: late Miocene
Etrema mirabilis MA70969-a.jpg
Holotype from Auckland War Memorial Museum
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Family: Clathurellidae
Genus: Etrema
Species:
†E. mirabilis
Binomial name
†Etrema mirabilis

Etrema mirabilis 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.

Contents

Description

In the original description, Powell described the species as follows:

Large, differing from all other species of Etrema in the total absence of axials, concave, inwardly inclined shoulder and erect, papillate, smooth protoconch of 21⁄4 whorls without a keel. Spiral sculpture of broad, flattened cords separated by narrow, shallow interspaces, 8 on penultimate, 23 on body-whorl. A thread in each interspace over the median area of body-whorl. Sinus deep, subtubular. Parietal tubercle strong. Outer lip thin and crenulated at edge, strengthened behind by a heavy varix, and within by a narrow ridge. [2]

The holotype of the species measures 17.5 mm (0.69 in) in length and has a diameter of 7.6 mm (0.30 in). [2] It can be distinguished from E. gippslandensis due to the slight angulation on the last whorl of the shell. [2]

Taxonomy

The species was first described by A. W. B. Powell in 1944 as Pseudoinquisitor trinervis. [2] The holotype was collected by farmer Christopher Ritchie, likely from the Mississippi Creek near Lakes Entrance in Victoria, Australia at an unknown date prior to 1937. A part of the Finlay Collection held by the Auckland War Memorial Museum, H. J. Finlay had stolen the specimen from the National Museum of Victoria's Dennant Collection, which had been on loan to F. A. Singleton. [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]

References

  1. ↑ Etrema mirabilis (A. W. B. Powell, 1944) † . Retrieved through: World Register of Marine Species  on 18 December 2025.
  2. 1 2 3 4 Powell, A. W. B. (1944). "The Australian Tertiary Mollusca of the Family Turridae". Records of the Auckland Institute and Museum . 3: 3–68. ISSN   0067-0464. JSTOR   42905993. Wikidata   Q58676624.CC BY icon-80x15.png This article incorporates text from this source, which is under a CC BY 4.0 license.
  3. 1 2 Blom, Wilma M. (2025). "Annotated Catalogue of Fossil and Extant Molluscan Types in the Auckland War Memorial Museum". Bulletin of the Auckland Museum . 22. doi:10.32912/BULLETIN/22. ISSN   1176-3213. OCLC   1550165130. Wikidata   Q135397912.
  4. ↑ "Etrema mirabilis". Collections Online. Auckland War Memorial Museum . Retrieved 18 December 2025.
  5. ↑ Darragh, Thomas A. (August 2024). "A checklist of Australian marine Cenozoic Mollusca". Memoirs of Museum Victoria . 83: 37–206. doi:10.24199/J.MMV.2024.83.02. ISSN   1447-2546. Wikidata   Q136396722.
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