Pantosteus discobolus
species of fish
The bluehead sucker (Pantosteus discobolus) is a species of freshwater cypriniform fish endemic to the intermountain Western US. Formerly placed in the genus Catostomus, it is now placed in the genus Pantosteus.
Description
The bluehead sucker is the largest of all Arizona endemic suckers, reaching lengths over 11.8 in. Their colors are very similar to the desert sucker, with dark green or dark silvery top portions and light yellow bottoms. The bluehead has the largest lips of any sucker and has tiny papillae on the lower lip. This is also the only species with the absence of an inguinal process, just behind the pectoral fins, distinguishing it from the other eight suckers. The lower lip is slightly notched at the midline, with lateral line scales in large numbers that range from 70 to 100. They have 7 to 9 dorsal fin rays and a smaller number of caudal fin rays. During breeding, the males obtain a blue patch on the top of their large heads, and the lower fins become yellow/orange with red/rosy lateral lines. These drastic coloration changes are probably due to sexual selection and female mate choice. An easy way to distinguish the bluehead from the other Arizona suckers is the distinct cartilaginous lower jaw.
The public source identifies “Pantosteus discobolus” as species of fish. This brief keeps that definition visible, then builds a research path around Pantosteus, discobolus and species.
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Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Oct 3, 2025. The linked authority identifier is Q2942990. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Pantosteus discobolus” 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.