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 25–45mm (0.98–1.77in) 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 75–85m (246–279ft).[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 15–47m (49–154ft) from the shores of the islands, with shells of dead specimens washing up onto beaches.[8]
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