Syntomodrillia obsoleta
| Syntomodrillia obsoleta Temporal range:
| |
|---|---|
| Holotype from Auckland War Memorial Museum | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Neogastropoda |
| Family: | Drilliidae |
| Genus: | Syntomodrillia |
| Species: | †S. obsoleta
|
| Binomial name | |
| †Syntomodrillia obsoleta Powell, 1944
| |
Syntomodrillia obsoleta is an extinct species of sea snail, a marine gastropod mollusc in the family Drilliidae.[1] Fossils of the species date to the middle Miocene, and have been found in the strata of the Port Phillip Basin of Victoria, Australia.
Description
In the original description, Powell described the species as follows:
Much smaller than sandleroides, has weaker axials and obsolescent spirals. Shell small, glossy ; whorls 5½, including typical smooth, globular protoconch of two whorls. Post-nuclear whorls sculptured with moderately strong, but narrow, obliquely flexuous axials, which extend from the upper suture and fade out about the middle of the base; 12-13 per whorl; 12 on penultimate in holotype. The axials are slightly thickened at the weak peripheral angle, which is just above the middle. There is no spiral sculpture apart from four obsolescent threads on the anterior end.[2]
The holotype of the species measures 5.3 mm (0.21 in) in height and 1.9 mm (0.075 in) in diameter.[2]
Taxonomy
The species was first described by A.W.B. Powell in 1944.[2] The holotype was collected from Fossil Beach, Balcombe Bay, Victoria, Australia, at an unknown date prior to 1944, and is held by the Auckland War Memorial Museum.[3][4]
Distribution
This extinct marine species dates to the middle Miocene, and occurs in the strata of the Port Phillip Basin of Victoria, Australia, found in the Gellibrand Formation.[3][5]
References
- ^ a b Syntomodrillia ludbrookae A. W. B. Powell, 1944 †. 13 November 2025. Retrieved through: World Register of Marine Species.
- ^ a b c 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.
- ^ a b 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.
- ^ "Syntomodrillia obsoleta". Collections Online. Auckland War Memorial Museum. Retrieved 13 November 2025.
- ^ 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.