Opetiosaurus
species of reptile
Opetiosaurus is an extinct genus of Late Cretaceous marine or semiaquatic lizard classified as part of the family Aigialosauridae within the Mosasauroidea. Exclusively found in deposits of Cenomanian age near Hvar, Croatia, the genus contain one valid species, O. bucchichi. It was a small reptile measuring 1 metre (3.3 ft) long.
The genus was diagnosed as congenetic with Aigialosaurus by Dutchak and Caldwell (2009), being re-diagnosed as "Aigialosaurus bucchichi" and only separated by some minor anatomical differences between specimens of the two species. Madzia & Cau (2017) show that the two species are not necessarily more closely related to each other than either is to more derived mosasauroids, suggesting not only that Opetiosaurus is a valid genus, but also calling the validity of the Aigialosauridae as a monophyletic group into question.
Begin with the source’s own compact description: “Opetiosaurus” is species of reptile. The dossier treats that line as a proposition to test through Opetiosaurus, species and reptile, not as a finished interpretation.
Why this record matters
The phrase “species of reptile” 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.
Stable identifiers, scientific names and standards terminology offer the best bridge between this overview and specialist evidence. The source revision retrieved here is dated Aug 15, 2025. The linked authority identifier is Q45269867. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2009 and 2017.
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.
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Three-step research path
- Establish the record: confirm the title “Opetiosaurus”, 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 “Opetiosaurus” 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.