Red side-necked turtle
species of reptile
The red side-necked turtle (Rhinemys rufipes), red turtle, red-footed sideneck turtle, William's toadhead turtle, or red-footed Amazon side-necked turtle is a monotypic species of turtle in the family Chelidae. It is found in Brazil, Colombia, and possibly Peru.
Description
This species is dimorphic in size meaning the sexes show different characteristics. One study found that the largest female out of a group of 24 was 256 mm in carapace length. Out of that same group, the largest male was only 199 mm in carapace length. A study focused on determining how these turtles acquire their sex discovered that it is not environmentally determined rather, it is a genetic sex determination.
This brief starts where responsible research should: with the source description of “Red side-necked turtle” as species of reptile. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the science & nature register because the source frames it as species of reptile. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Apr 29, 2026. The linked authority identifier is Q2260750. None of the 0 selected statements returned an explicit reference.
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.
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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
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Questions for further research
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This entry incorporates text from “Red side-necked turtle” 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.