Syntomodrillia waiauensis

Syntomodrillia waiauensis Temporal range: middle 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:	Drilliidae
Genus:	Syntomodrillia
Species:	†S. waiauensis
Binomial name
†Syntomodrillia waiauensis Powell, 1942

Syntomodrillia waiauensis 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 at Clifden, Southland, New Zealand.

Description

Reverse view of holotype

The species has a small fusiform shell, and a spire that is marginally taller than the aperture and canal combined. The shell has 6.5 whorls, including a protoconch of two whorls which are globular and smooth. ^[2] The holotype of the species measures 5.5 mm (0.22 in) in height and 2.3 mm (0.091 in) in diameter. ^[2]

Taxonomy

The species was first described by A.W.B. Powell in 1942. ^[2] The holotype was collected from the Slip Point Siltstone near Clifden, Southland, New Zealand at an unknown date prior to 1942. It is held by the Auckland War Memorial Museum. ^{[3] [4]}

Distribution

This extinct marine species dates to the middle Miocene (Clifdenian), and occurs in the strata of the Slip Point Siltstone in Clifden, Southland, New Zealand. ^[3]

References

1. Syntomodrillia waiauensis A. W. B. Powell, 1942 † . 13 November 2025. Retrieved through: World Register of Marine Species .
2. Powell, A. W. B. (1942). "The New Zealand recent and fossil Mollusca of the family Turridae, with general notes on Turrid nomenclature and systematics". Bulletin of the Auckland Institute and Museum . 2: 105. ISSN   0067-0456. OCLC   1826451. Wikidata   Q115110377.
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. Wikidata   Q135397912.
4. "Syntomodrillia waiauensis". Collections Online. Auckland War Memorial Museum . Retrieved 13 November 2025.

Further reading

• Maxwell, P. A. (2009). "Cenozoic Mollusca". In Gordon, D. P. (ed.). New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Christchurch: Canterbury University Press. pp. 232–254. ISBN   978-1877257728.