Thyasira bartrumi
Thyasira bartrumi is an extinct species of bivalve, a marine mollusc in the family Thyasiridae. Fossils of the species date to early Miocene strata of the west coast of the Auckland Region, New Zealand.
Description
In the original description, Powell described the species as follows:The holotype of the species measures in height and width, and has a diameter of when measuring both valves. The species can be differentiated from T. marwicki and T. motutaraensis due to its more deeply excavated lunule, by not being bordered by a furrow, and its very oblique outline.
Taxonomy
The species was first described by A. W. B. Powell in 1935 as Thyasira bartrumi. Its currently accepted name is Thyasira bartrumi, without a subgenus. The holotype was collected at an unknown date prior to 1935 from between Powell Bay and Bartrum Bay, approximately south of Muriwai, Auckland Region, and is held in the collections of Auckland War Memorial Museum.In 2020, palaeontologists Steffen Kiel, Yolanda Aguilar and Tomoki Kase suggested that the fossil species may belong to the genus Channelaxinus, due to morphological similarities.