Penion hiatulus

Penion hiatulus
Temporal range:
Holotype from Auckland War Memorial Museum
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Family: Austrosiphonidae
Genus: Penion
Species:
†P. hiatulus
Binomial name
†Penion hiatulus
Synonyms[1]
  • Verconella hiatula A. W. B. Powell, 1947

Penion hiatulus is an extinct species of marine mollusc gastropod in the family Austrosiphonidae.[1] Fossils of the species date to the Pliocene in New Zealand.

Description

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

The first known member of the elongata series. It differs from all other species in having the middle whorls devoid of axials. Spire angle 45 degrees. Aperture + canal 1.308 times height of spire. Adult whorls 8; protoconch missing. Periphery situated from below the middle to the lower third of whorl height, bluntly angled on the whorls hearing axials but narrowly rounded on those devoid of axials. First four post-nuclear whorls with fold-like axials, next three whorls including the penultimate without axials, body-whorl with eight blunt slightly vertically compressed prominent nodules. The shoulder is broadly but distinctly concave, and descends at an angle of 145 degrees to the axis of the shell. Surface sculpture fine of approximately evenly developed threads, 25-28 per centimeter. Three to five slightly stronger spirals traverse the peripheral nodules. Aperture finely lirate within the slightly thickened outer lip.[2]

The holotype of the species has a height of 125 mm (4.9 in) and a diameter of 56 mm (2.2 in).[2]

Taxonomy

The species was first described by A.W.B. Powell in 1947, using the name Verconella hiatula.[2] The genus Verconella was synonymised with Penion in 1954,[3] leading to the species' current accepted name.[4][1] The holotype was collected in January 1927 by A. W. B. Powell, from the South Taranaki Bight coast between the Kai Iwi Stream and Okehu Stream in the Whanganui District, New Zealand, and is held by the Auckland War Memorial Museum.[5][6]

Distribution

This extinct marine species occurs in Pliocene (Opoitian stage) of New Zealand, dating to 5.33 million years before the present.[4]

References

  1. ^ a b c Penion hiatulus (A. W. B. Powell, 1947) †. 5 March 2026. Retrieved through: World Register of Marine Species.
  2. ^ a b c Powell, A. W. B. (1947). "Phytogeny of the Molluscan Genus Verconella, with Descriptions of New Recent and Tertiary Species". Records of the Auckland Institute and Museum. 3: 161–169. ISSN 0067-0464. JSTOR 42906004. Wikidata Q58676644. This article incorporates text from this source, which is under a CC BY 4.0 license.
  3. ^ Fleming, C. A. (1954). "Kapitean (Upper Miocene) Mollusca from Te Waewae Bay, Southland, New Zealand" (PDF). Transactions of the Royal Society of New Zealand. 82: 1049–1059. ISSN 0035-9181. Wikidata Q89183541.
  4. ^ a b 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. p. 246. ISBN 978-1-877257-72-8.
  5. ^ 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.
  6. ^ "Penion hiatulus". Collections Online. Auckland War Memorial Museum. Retrieved 5 March 2026.
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