Streptognathodus
genus of conodonts
Streptognathodus is an extinct genus of conodonts from the Late Carboniferous to Early Permian.
Use in stratigraphy
Late Carboniferous
The top of the Kasimovian stage is close to the first appearance of Streptognathodus zethus. The golden spike for the Kasimovian stage has not yet been assigned (in 2008).
The Kasimovian is subdivided into three conodont biozones:
Idiognathodus toretzianus Zone
Idiognathodus sagittatus Zone
Streptognathodus excelsus and Streptognathodus makhlinae Zone
The base of the Gzhelian is at the first appearance of Streptognathodus zethus. The top of the stage (also the top base of the Silesian and the base of the Permian system) is at the first appearance of Streptognathodus isolatus within the Streptognathus "wabaunsensis" chronocline.
The Gzhelian stage is subdivided into five biozones, based on the conodont genus Streptognathodus:
Streptognathodus wabaunsensis and Streptognathodus bellus Zone
Streptognathodus simplex Zone
Streptognathodus virgilicus Zone
Streptognathodus vitali Zone
Streptognathodus simulator Zone
Early Permian
The base of the Asselian stage is at the same time the base of the Cisuralian series and the Permian system. It is defined as the place in the stratigraphic record where fossils of the species Streptognathodus isolatus first appear. The global reference profile for the base (the GSSP or golden spike) is located in the valley of the Aidaralash River, near Aqtöbe in the Ural Mountains of Kazakhstan. The top of the Asselian stage (the base of the Sakmarian stage) is at the first appearance of the species Streptognathodus postfusus.
The Asselian contains five conodont biozones:
zone of Streptognathodus barskovi
zone of Streptognathodus postfusus
zone of Streptognathodus fusus
zone of Streptognathodus constrictus
zone of Streptognathodus isolatus
The base of the Sakmarian stage is laid with the first appearance of Streptognathodus postfusus in the fossil record.
“Streptognathodus” enters the record as genus of conodonts. Crown Archives preserves that source wording while asking what Streptognathodus, genus and conodonts can confirm, complicate or overturn.
Why this record matters
“Streptognathodus” is worth following because a concise public description often conceals a longer documentary argument. Here, Streptognathodus, genus and conodonts provides the most credible route into that argument.
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 Apr 26, 2026. The linked authority identifier is Q24887929. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2008.
Current terminology should not be projected backward without checking the classification used when the underlying evidence was created. 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
- Classification context
- Finding cited technical literature
Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.
Three-step research path
- Establish the record: confirm the title “Streptognathodus”, its source revision and the description used here.
- Expand the search: follow Streptognathodus primary sources, Streptognathodus archive and Streptognathodus 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 “Streptognathodus”?
- Is the terminology current, historical or disputed?
- Has classification or technical consensus changed since the cited source?
Search terms from this dossier
This entry incorporates text from “Streptognathodus” 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.