Biology:Thyasira bartrumi
| Thyasira bartrumi | |
|---|---|
| File:Thyasira bartrumi MA72151-a.jpg | |
| Holotype from Auckland War Memorial Museum | |
Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Lucinida |
| Family: | Thyasiridae |
| Genus: | Thyasira |
| Species: | †T. bartrumi
|
| Binomial name | |
| †Thyasira bartrumi A. W. B. Powell, 1935
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| Synonyms[1][2] | |
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Thyasira bartrumi is an extinct species of bivalve, a marine mollusc in the family Thyasiridae.[2] 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:
Shell of moderate size, thin, very oblique and inequilateral, equivalve and inflated. Beaks at about anterior seventh, small, directed forwards and incurved at tips. Anterior end short, with a large, deeply excavated lunule which extends from just below the beaks to the angle with the ventral margin. The greatly produced posterior end has two deep arcuate furrows bordering the dorsal slope, and a very broad but only slightly raised medial fold which runs from the beaks to behind the anterior fourth on the ventral margin. Surface smooth except for regular microscopic concentric lines of growth. Interior not accessible in any of the specimens.[3]
The holotype of the species measures 15 mm (0.59 in) in height and width, and has a diameter of 10.75 mm (0.423 in) when measuring both valves.[3] 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.[3]
Taxonomy
The species was first described by A. W. B. Powell in 1935 as Thyasira (Prothyasira) bartrumi.[3] Its currently accepted name is Thyasira bartrumi, without a subgenus.[4][2] The holotype was collected at an unknown date prior to 1935 from between Powell Bay and Bartrum Bay, approximately 2 km (1.2 mi) south of Muriwai, Auckland Region (then more commonly known as Motutara), and is held in the collections of Auckland War Memorial Museum.[5][1]
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.[6]
Distribution
This extinct marine species occurs in early Miocene strata of the Nihotupu Formation of New Zealand, on the west coast of the Waitākere Ranges of the Auckland Region, New Zealand.[5]
Gallery
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Opposite valve of holotype
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Side view of holotype
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Side view of holotype
References
- ↑ 1.0 1.1 "Thyasira bartrumi". Auckland War Memorial Museum. https://www.aucklandmuseum.com/discover/collections/record/209898.
- ↑ 2.0 2.1 2.2 Thyasira bartrumi (A. W. B. Powell, 1935) †. Retrieved through: World Register of Marine Species on 19 January 2026.
- ↑ 3.0 3.1 3.2 3.3 , Wikidata Q58676576 Template:Source-attribution-CC BY 4.0
- ↑ Maxwell, P.A. (2009). "Cenozoic Mollusca". New Zealand Inventory of Biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia.. Christchurch: Canterbury University Press. p. 236. ISBN 978-1-877257-72-8.
- ↑ 5.0 5.1 , Wikidata Q135397912
- ↑ , Wikidata Q104623761
Further reading
- Fleming, Charles Alexander; Marwick, John (1966). Marwick's Illustrations of New Zealand Shells with a Checklist of New Zealand Cenozoic Mollusca. Wellington: R. E. Owen, Govt. Printer. p. 26. OCLC 955302.
Wikidata ☰ Q137815817 entry
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