Xenotoca lyonsi
species of fish
Xenotoca lyonsi, the Tamazula redtail splitfin, is a bony fish species in the goodeid family. Until 2016 it was considered to be a variant of the redtail goodeid, Xenotoca eiseni. A 2016 study by Omar Dominguez-Dominguez, et al. split the redtail goodeid into three separate species: Xenotoca eiseni, Xenotoca doadrioi and Xenotoca lyonsi.
Etymology
The fish is named in honor of the ichthyologist John Lyons, of the Wisconsin Department of Natural Resources.
The IUCN lists Xenotaca lyonsi as critically endangered.
Xenotoca lyonsi is endemic to the Coahuayana River drainage in Jalisco, Mexico.
Xenotoca lyonsi reaches a standard length of 5 centimetres (2.0 in). Males are more colorful than females, with red caudal fin and caudal peduncle, and blue area in front of the red. Females are brownish or brownish grey, and sometimes have a horizontal dark band across the middle of the body.
“Xenotoca lyonsi” enters the record as species of fish. Crown Archives preserves that source wording while asking what Xenotoca, lyonsi and species can confirm, complicate or overturn.
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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 29, 2026. The linked authority identifier is Q67184166. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2016.
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This entry incorporates text from “Xenotoca lyonsi” 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.