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Etrema janjukiensis

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Etrema janjukiensis
Temporal range: early Miocene
Etrema janjukiensis MA70968-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. janjukiensis
Binomial name
†Etrema janjukiensis

Etrema janjukiensis is an extinct species of sea snail, a marine gastropod mollusc, in the family Pseudomelatomidae. [1] Fossils of the species date to early Miocene strata of the Port Phillip Basin of Victoria, Australia, and the Bass Basin of Tasmania.

Contents

Description

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

Similar to [ Heterocithara granolirata ] in shape and primary sculpture, but without the secondary granular lirations. Also the sinus is deeper and there is a strong parietal tubercle. Protoconch as in granolirata. Spire-whorls with 4-5 lirations on the shoulder, 4 narrow spiral cords from peripheral angle to lower suture, the peripheral cord being no stronger than the others. Body-whorl with about 22 spirals, the last 12 linear-spaced on the anterior end. No interstitial threads (excepting 1 below the carina on body-whorl in the holotype only). Axials narrowly rounded, extending from upper suture over the base to the neck, 16 per whorl, weaker on shoulder. [2]

The holotype of the species measures 5.7 mm (0.22 in) in height and has a diameter of 2.4 mm (0.094 in). [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 Fossil Bluff Sandstone at Fossil Bluff, a location close to Wynyard, Tasmania. It is held by the Auckland War Memorial Museum. [3] [4]

Distribution

This extinct marine species occurs in early Miocene strata of the Port Phillip Basin of Victoria, Australia, and the Bass Basin of Tasmania, including the Puebla Formation and Freestone Cove Sandstone. [3] [5]

References

  1. ↑ Etrema janjukiensis A. W. B. Powell, 1944 † . Retrieved through: World Register of Marine Species  on 19 February 2026.
  2. 1 2 3 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 janjukiensis". Collections Online. Auckland War Memorial Museum . Retrieved 19 February 2026.
  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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