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Pantosteus

Pantosteus, the mountain suckers, is a genus of North American freshwater ray-finned fish in the family Catostomidae. Long treated as a subgenus of Catostomus, phylogenetic evidence has found them to a form a monophyletic group that diverged from other members of Catostomus during the Miocene, and they are thus treated better as a distinct genus.

Taxonomy
The following species are placed in this genus: • Pantosteus clarkii (Baird & Girard, 1854) (Desert sucker) • P. c. intermedius (Tanner, 1942) (White River desert sucker) • P. c. utahensis (Tanner, 1932) (Virgin River desert sucker) • P. c. "unnamed" (Meadow Valley Wash desert sucker) • Pantosteus discobolus (Cope, 1871) (bluehead sucker) • Pantosteus jarrovii (Cope, 1874) (Zuni bluehead sucker) • Pantosteus jordani Evermann, 1893 (Plains sucker) • Pantosteus lahontan Rutter, 1903 (Lahontan sucker) • Pantosteus nebuliferus (Garman, 1881) (Nazas sucker) • Pantosteus platyrhynchus (Cope, 1874) (Mountain sucker) • Pantosteus plebeius (Baird & Girard, 1854) (Rio Grande sucker) • Pantosteus santaanae Snyder, 1908 (Santa Ana sucker) • Pantosteus virescens Cope, 1875 (Green sucker) Catostomus columbianus was also previously placed in Pantosteus, and appears to have undergone some hybridization with Pantosteus in the past. However, treating it as a member of Pantosteus makes the genus Catostomus paraphyletic, and it thus continues to be treated as a member of Catostomus. The following fossil species are also known: • †Pantosteus asitus (Smith, Stewart & Carpenter, 2013) - Early Pliocene of Nevada, US (White Narrows Formation) • †Pantosteus arenatus (Miller & Smith, 1967) - Late Pliocene of Idaho, US (Glenns Ferry Formation) • †Pantosteus hyomyzon (Smith, Stewart & Carpenter, 2013) - Middle Miocene to Late Miocene of Oregon and Washington, US (Juntura Formation, Drewsey Formation and Ellensburg Formation) • †Pantosteus oromyzon (Smith, Stewart & Carpenter, 2013) - Early Pliocene of Idaho, US (Glenns Ferry Formation) == References ==
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