Tetradimorpha pterbica
genus of Cryptista
Tetradimorpha pterbica (from Latin tetra- 'four' and helio- 'sun') is a species of four-ciliated protists.
Description
Tetradimorpha pterbica are unicellular ciliates with four standard-length centrioles that are shorter than in Heliomorpha and other Tetradimorpha, and axopodia generated by a globular centrosome with a distinct granular shell and a microfibrillar core. The centrioles are arranged in two pairs: each pair has two parallel centrioles, and the pairs are positioned at 30° of rotation between each other. They are linked at the base by an amorphous material that connects them to the centrosome. There are lateral dictyosomes on either side of the cell nucleus. The axopodia have several irregularly arranged microtubules and irregularly flattened extrusomes, instead of the kinetocysts seen in Heliomorpha and Tetradimorpha radiata. The cell size is larger than 60 μm, and the centrosome itself measures between 18 and 20 μm. There is a thick pseudopellicle layer beneath the cell membrane.
The life cycle of Tetradimorpha pterbica contains a lazily swimming, purely flagellate stage with fully retracted axopodia.
Classification
Cavalier-Smith proposed to assign this species to a new monotypic cryptist genus, Tetrahelia.
The public source identifies “Tetradimorpha pterbica” as genus of Cryptista. This brief keeps that definition visible, then builds a research path around Tetradimorpha, pterbica and genus.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Tetradimorpha pterbica”, the useful work is to connect “genus of Cryptista” to the records capable of establishing context and consequence.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Aug 15, 2026. The linked authority identifier is Q116776879. 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
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- Classification context
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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 “Tetradimorpha pterbica”, its source revision and the description used here.
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- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
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This entry incorporates text from “Tetradimorpha pterbica” 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.