Subonoba inornata
| Subonoba inornata | |
|---|---|
| Holotype from the Auckland War Memorial Museum | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Superfamily: | Rissooidea |
| Family: | Rissoidae |
| Genus: | Subonoba |
| Species: | S. inornata
|
| Binomial name | |
| Subonoba inornata A. W. B. Powell, 1933
| |
| Synonyms[1][2] | |
| |
Subonoba inornata is a species of sea snail, a marine gastropod mollusc in the family Rissoidae.[1] It is endemic to New Zealand, found in the southern South Island, the Chatham Islands, Snares Islands and Stewart Island.
Description
In the original description, Powell described the species as follows:
Shell minute, subcylindrical, thin, coloured uniformly pale buff. Surface dull, smooth except for weak spiral lirae. Whorls 41⁄2, including bluntly rounded protoconch of 11⁄2 smooth whorls. Spire tall, about 11⁄2 times height of aperture. Post-nuclear whorls faintly angled at the upper third. Sculpture consisting of low, indistinct spiral lirae, five on the penultimate and eight on the body-whorl and base. The width of the interspaces is about equal to that of the liras. On the base the three spirals are grouped above, leaving the lower half smooth. Aperture large, oblique, ovate-pyriform. Peristome continuous. Outer-lip dilated oblique in profile with a shallow sinus above, and inclined forwards basally.[3]
The shells of the species measure 1.92 mm (0.076 in) in height and 0.9 mm (0.035 in) in diameter.[4] It can be differentiated from S. parvula due to its larger size, shouldered appearance and by having fewer spiral lirae,[3] and identified due to its distinctly D-shaped large aperture.[5]
Taxonomy
The species was first described by A. W. B. Powell in 1933.[3] In 1995, Hamish Spencer and Richard C. Willan recombined the species as Onoba inornata.[6][7] While this remains the preferred name by the New Zealand Organisms Register, the original combination, S. inornata, is the preferred name by the World Register of Marine Species and The Marine Biota of Aotearoa New Zealand (2023).[1][8] The holotype was collected by Powell himself in February 1933, from seaweed at Waitangi in the Chatham Islands, and is held by the Auckland War Memorial Museum.[9][10]
Distribution and habitat
S. inornata is endemic to New Zealand,[8] found in the waters surrounding the South Island as far north as Banks Peninsula, Stewart Island, Snares Islands and the Chatham Islands, at depths between 0–33 m (0–108 ft).[4][11] Previously, the species was thought to be endemic to the Chatham Islands.[12]
References
- ^ a b c Subonoba inornata A. W. B. Powell, 1933. Retrieved through: World Register of Marine Species on 24 February 2026.
- ^ Spencer, H. G.; Marshall, B. A.; Willan, R. C. (June 2009). "Checklist of New Zealand living Mollusca". New Zealand Inventory of Biodiversity. Volume 1. Kingdom Animalia Radiata, Lopotrochozoa, Deuteromstomia. 1: 196–219. Wikidata Q125720861.
- ^ a b c Powell, A. W. B. (1933). "The Marine Mollusca of the Chatham Islands". Records of the Auckland Institute and Museum. 1: 181–208. ISSN 0067-0464. JSTOR 42905950. Wikidata Q58676558. This article incorporates text from this source, which is under a CC BY 4.0 license.
- ^ a b "Subonoba inornata Powell, 1933". New Zealand Mollusca. Retrieved 24 February 2026.
- ^ Powell, A.W.B. (1979). New Zealand Mollusca: Marine, Land and Freshwater Shells. Auckland: Collins. p. 112. ISBN 0002169061.
- ^ Spencer, H. G.; Willan, R. C. (1995). "The marine fauna of New Zealand: Index to the fauna. 3. Mollusca" (PDF). New Zealand Oceanographic Institute Memoir. 105: 1–125. ISSN 0083-7903. Wikidata Q66411987.
- ^ Morley, Margaret S. (April 1997). "New Zealand Mollusc Name Changes from Powell (1979) to Spencer & Willan (1996)". Poirieria. 20: 13–22.
- ^ a b Walton, K.; Marshall, B. A.; Spencer, H. G. (2023). "Chapter 14: Kingdom Animalia, phylum Mollusca (clams, slugs, snails, cephalopods, & kin)". In Kelly, M.; Mills, S.; Terezow, M.; Sim-Smith, C.; Nelson, W. (eds.). The Marine Biota of Aotearoa New Zealand. Updating our marine biodiversity inventory. NIWA Biodiversity Memoir. Vol. 136. p. 226.
- ^ 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.
- ^ "Subonoba inornata". Collections Online. Auckland War Memorial Museum. Retrieved 24 February 2026.
- ^ "Subonoba inornata Powell, 1933 (Species)". Collections Online. Te Papa. Retrieved 24 February 2026.
- ^ Dell, R. K.; Edmonds, S. J. (1961). "Biological results of the Chatham Islands 1954 Expedition. Part 4. Marine Mollusca; Sipunculoidea" (PDF). New Zealand Oceanographic Institute Memoir. 7: 1–27. ISSN 0083-7903. Wikidata Q66412133.