Scrinium nanum

Scrinium nanum Temporal range: early Miocene PreꞒ Ꞓ O S D C P T J K Pg N
Holotype from Auckland War Memorial Museum
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Family:	Mitromorphidae
Genus:	Scrinium
Species:	†S. nanum
Binomial name
†Scrinium nanum A. W. B. Powell, 1944

Scrinium nanum is an extinct species of sea snail, a marine gastropod mollusc in the family Mitromorphidae. ^[1] Fossils of the species date to the early Miocene, and occur in the strata of the Port Phillip Basin of Victoria, Australia.

Description

Reverse view of holotype

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

Similar to duplicatum , but smaller; spiral sculpture weaker, subsutural fold much heavier, not duplicated, and axials obsolete or subobsolete on last half-whorl. Whorls 5½, including smooth, dome-shaped protoconch of 14 whorls. There is a deep, narrow excavation below the subsutural fold. Axials strong, broadly rounded, neither crossing shoulder excavation nor extending to the base, 10-12 on penultimate. Spiral sculpture of closely spaced fine threads, about 16 on penultimate and about 36 on body- whorl and base, those on the base being the stronger. ^[2]

The holotype of the species measures 6.1 mm (0.24 in) in height and 3 mm (0.12 in) in diameter. ^[2]

Taxonomy

The species was first described by A.W.B. Powell in 1944. ^[2] The holotype was collected from Torquay, Victoria, 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 early Miocene, and occurs in the strata of the Port Phillip Basin of Victoria, Australia, known from the Puebla Formation. ^{[3] [5]}

References

1. Scrinium nanum A. W. B. Powell, 1944 † . 24 November 2025. Retrieved through: World Register of Marine Species .
2. 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.
3. 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. "Scrinium nanum". Collections Online. Auckland War Memorial Museum . Retrieved 24 November 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.