CACrown ArchivesThe cinema collection
EN/FR
Search
Menu
Research dossier · Science & Nature

Ptychotrema

genus of molluscs

Specimen drawers, botanical folios and brass scientific instruments under study light
Science and natureInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionMay 20, 2026
Entity authorityQ7257170 ↗
Source-derived summary

Ptychotrema is a genus of air-breathing land snails, terrestrial pulmonate gastropod molluscs in the subfamily Enneinae of the family Streptaxidae.

Distribution

The distribution of the genus Ptychotrema is Afrotropical, and includes:

Uganda

Species

Species within the genus Ptychotrema include:

Ptychotrema aequatoriale Pilsbry, 1919

Ptychotrema bequaerti (Dautzenberg & Germain, 1914)

Ptychotrema cossyphae van Bruggen, 1989

Ptychotrema fraterculus Pilsbry, 1919

Ptychotrema geminatum (Martens, 1895)

Ptychotrema goossensi (Adam & van Goethem, 1978)

Ptychotrema kerereense (Adam & van Goethem, 1978)

Ptychotrema kigeziense (Preston, 1913)

Ptychotrema mazumbiensis Tattersfield, 1999

Ptychotrema paradoxulum (Martens, 1895)

Ptychotrema pelengeense (Adam & van Goethem, 1978)

Ptychotrema pollonerae Preston, 1913

Ptychotrema runsoranum (Martens, 1892)

Ptychotrema silvaticum Pilsbry, 1919

Ptychotrema usambarense Verdcourt, 1958

References

Bruggen A. C. van (1989) "Studies on Parennea (Mollusca, Gastropoda Pulmonata, Streptaxidae) additional to the revision by Adam & van Goethem, 1978". Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen (series C) 92: 1-56.

Further reading

Adam W. & van Goethem J. L. (1978). Revision du sous-genre Parennea Pilsbry du Genre Ptychotrema Morch (Mollusca-Pulmonata-Streptaxidae)". Études du Continent Africain, Bruxelles 5: 1-79.

Oke O. C. & Odiete W.O. (1996). "New species of land molluscs from south western Nigeria I. A new species attributed to Ptychotrema (Mollusca, Gastropoda)". Journal of African Zoology 110: 99–104.

Verdcourt B. (1985).

Editorial summary

Begin with the source’s own compact description: “Ptychotrema” is genus of molluscs. The dossier treats that line as a proposition to test through Ptychotrema, genus and molluscs, not as a finished interpretation.

Editorial reviewUseful for establishing the present vocabulary of the subject while preserving a route back to the evidence on which that vocabulary rests. The current lead gives the account dated anchors—1919, 1914, 1989, 1895—that can be checked directly. The selected authority fields contribute no independent date. For this dossier, Ptychotrema, genus and molluscs is the immediate research focus.
Editorial analysis

Why this record matters

The phrase “genus of molluscs” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.

Evidence profile

Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated May 20, 2026. The linked authority identifier is Q7257170. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1919, 1914, 1989 and 1895.

Critical limits

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.

Best used for
  • Current terminology
  • Classification context
  • Finding cited technical literature
Verify next

Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.

Three-step research path

  1. Establish the record: confirm the title “Ptychotrema”, its source revision and the description used here.
  2. Expand the search: follow Ptychotrema primary sources, Ptychotrema archive and Ptychotrema research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “Ptychotrema”?
  2. Which observation, specimen, dataset or publication supports the account?
  3. Is the terminology current, historical or disputed?
Subject index

Search terms from this dossier

Source & attribution

This entry incorporates text from “Ptychotrema” 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.