Acrosterigma sorenseni
| Acrosterigma sorenseni | |
|---|---|
| Holotype of Acrosterigma sorenseni | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Superorder: | Imparidentia |
| Order: | Cardiida |
| Superfamily: | Cardioidea |
| Family: | Cardiidae |
| Genus: | Acrosterigma |
| Species: | A. sorenseni
|
| Binomial name | |
| Acrosterigma sorenseni (A. W. B. Powell, 1958)
| |
| Synonyms[2] | |
| |
Acrosterigma sorenseni is a species of cockle, a marine bivalve mollusk, in the family Cardiidae.[2] The species is endemic to New Zealand, found in the waters surrounding the Kermadec Islands.
Description
Acrosterigma sorenseni is subcircular, has acute beaks, and is flattened and incurved. The species has a sculpture consisting of 54 flat-topped radial ribs, defined sharply by deeply channelled linear interspaces crenulate at the sides. The species' shell is pinkish-white blotched with orange and pink when young. The shells measure between 25–45 mm (0.98–1.77 in) in height, which is small for the genus.[3][4] The species can be differentiated from A. cygnorum due to having a higher rib number, having square-sided ribs, and wider ridges on the ribs.[4]
Taxonomy
The species was first described using the name Trachycardium (Vasticardium) sorenseni in 1958 by Baden Powell, based on a holotype found off the coast of Raoul Island in the Kermadec Islands, at a depth between 75–85 m (246–279 ft).[3] The holotype of the species is held at the Auckland War Memorial Museum.[5][6] In 1999 the species had been recombined by Jacques Vidal, who placed it in the genus Acrosterigma.[4]
Distribution and habitat
The species is endemic to the waters surrounding the Kermadec Islands, northeast of mainland New Zealand.[7] They are typically found at a depth of between 15–47 m (49–154 ft) from the shores of the islands, with shells of dead specimens washing up onto beaches.[8]
References
- ^ "Acrosterigma sorenseni (Powell, 1967)". New Zealand Threat Classification System. 2023. Retrieved 16 September 2025.
- ^ a b Acrosterigma sorenseni (A. W. B. Powell, 1958). Retrieved through: World Register of Marine Species on 16 September 2025.
- ^ a b Powell, A. W. B. (1958). "Mollusca of the Kermadec Islands: Part I". Records of the Auckland Institute and Museum. 5: 65–85. ISSN 0067-0464. JSTOR 42906092. Wikidata Q58676766.
- ^ a b c Vidal, Jacques (1999). "Taxonomic review of the elongated cockles: genera Trachycardium, Vasticardium and Acrosterigma (Mollusca, Cardiidae)" (PDF). Zoosystema. 21 (2): 259–335. ISSN 1280-9551. Wikidata Q93463311.
- ^ 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.
- ^ "Acrosterigma sorenseni". Collections Online. Auckland War Memorial Museum. Retrieved 16 September 2025.
- ^ Spurgeon, Andrew. "Acrosterigma sorenseni (Powell, 1958)". www.mollusca.co.nz. Retrieved 16 September 2025.
- ^ Brook, F. J. (June 1998). "The coastal molluscan fauna of the northern Kermadec Islands, Southwest Pacific Ocean". Journal of the Royal Society of New Zealand. 28 (2): 185–233. doi:10.1080/03014223.1998.9517560. ISSN 0303-6758. Wikidata Q54638286.