Thyasira bartrumi
fossil mollusc species
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:
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.
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. 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.
The public source identifies “Thyasira bartrumi” as fossil mollusc species. This brief keeps that definition visible, then builds a research path around Thyasira, bartrumi and fossil.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Thyasira bartrumi”, the useful work is to connect “fossil mollusc species” to the records capable of establishing context and consequence.
Stable identifiers, scientific names and standards terminology offer the best bridge between this overview and specialist evidence. The source revision retrieved here is dated May 15, 2026. The linked authority identifier is Q137815817. None of the 0 selected statements returned an explicit reference.
A general summary may omit uncertainty, sample limits or methodological disagreement that is explicit in the technical record. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Check terminology, classification and the date of the cited evidence. Scientific names and technical consensus can change while older records retain historical value.
- Current terminology
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Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.
Three-step research path
- Establish the record: confirm the title “Thyasira bartrumi”, its source revision and the description used here.
- Expand the search: follow Thyasira bartrumi primary sources, Thyasira bartrumi archive and Thyasira research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Thyasira bartrumi”?
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- Which observation, specimen, dataset or publication supports the account?
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This entry incorporates text from “Thyasira bartrumi” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.