Biology:Etremopsis contigua

Short description: Extinct species of gastropod

Etremopsis contigua Temporal range: middle Miocene PreЄ Є O S D C P T J K Pg N ↓
Holotype from Auckland War Memorial Museum
Scientific classification
Missing taxonomy template (fix):	Etremopsis
Species:	†E. contigua
Binomial name
†Etremopsis contigua A. W. B. Powell, 1944

Etremopsis contigua is an extinct species of sea snail, a marine gastropod mollusc, in the family Clathurellidae. Fossils of the species date to middle Miocene strata of the St Vincent Basin of South Australia.

Description

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

Close to opposita, but constantly of much smaller size, differing in having fewer, heavier, more broadly rounded axials, a much sharper peripheral angle, and a well developed parietal tubercle. Details of spiral sculpture as in opposita. Protoconch typical, tall, polygyrate, of 4​¹⁄₂ whorls, tip minute, lower whorls carinated below the middle, last whorl with strong brephic axials.

The holotype of the species measures 4.1 mm (0.16 in) in height and has a diameter of 2 mm (0.079 in).

Taxonomy

The species was first described by A. W. B. Powell in 1944. The holotype was collected by W. Howchin and J. C. Verco in 1919 from the Metropolitan Abattoirs Bore in Adelaide, Australia, at a depth of between 122–152 m (400–499 ft), and is held by the Auckland War Memorial Museum.

Distribution

This extinct marine species occurs in middle Miocene strata of the St Vincent Basin of South Australia, including the Dry Creek Sands.

Gallery

• 
  Reverse view of holotype
• 
  Side view of holotype

References

Wikidata ☰ Q138341429 entry