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<br />
<br />the larger size
<br />the caudal fm
<br />
<br />Living suckers of this genus include the cui-ui lakesucker Chasmistes cujltS,
<br />from Pyramid Lake, Nevada, the Klamath sucker, Chasmistes brevirostris from
<br />Klamath Lake, Oregon, the June sucker, Chasmistes liorus, from Utah Lake, Utah,
<br />and an unnamed species from Oregon. Dr. Hubbs identified the specimen from the
<br />Snake River as Chasmistes liarus, but Dr. R. R. Miller believes that it may be a
<br />distinct species (personal communication).
<br />The known species of Chasmistes inhabit lakes. The peculiar mouth is
<br />apparently secondarily modified from the typical sucker mouth for feeding upon
<br />plankton.
<br />The specimen collected by Dr. Murie is presumed to have come from Jackson
<br />Lake. Whether this rare and unusual fish may still live in that lake remains to be
<br />determined.
<br />All of the suckers of the genus Chasmistes are believed to be in danger of
<br />extinction, partly as a result of the warming trend since the last glacial period, and
<br />the disappearance of pluvial lakes from the Western United States, partly as a result
<br />of man's activities. The species from Utah Lake may now be extinct, and the
<br />Jackson Lake form may, in fact have preceded its near relatives in becoming
<br />extinct.
<br />
<br />:kers.
<br />
<br />basins, the
<br />yorning this
<br />es.
<br />aIDS. It was
<br />Ireatment in
<br />iver, Savery
<br />It Cokeville,
<br />occasionally
<br />L(l966: 94)
<br />n the Weber
<br />s as warm as
<br />populations
<br />
<br />Iders, it may
<br />Ifge streams.
<br />described in
<br />ilvertebrates.
<br />.ecreasing in
<br />
<br />Humpback sucker
<br />Xyrauchen texanus (Abbott)
<br />
<br />435) from the
<br />e tlannelmouth
<br />another name,
<br />:onomy of this
<br />IP. virescens to
<br />
<br />
<br />Xyrauchen texanus. Simon, 1951: 62-63 (Green River).
<br />
<br />to the inferior
<br />eks behind the
<br />line; dorsal fm
<br />
<br />Body slender, with a pronounced sharp-ridged hump in adults just behind the head; head
<br />moderate; eye small; lateral line scales 73-95; dorsal rays 12-15; anal rays 1.
<br />Color dusky above, shading to yellow or white ventrally. Breeding males dark above,
<br />bright orange below.
<br />Distinguished by the nuchal hump.
<br />Weight to as much as 16 pounds (Hubbs and Miller, 1953) p. 226.
<br />
<br />Xyrauchen: razor-nape; texanus: of Texas (this species does not occur in Texas but the
<br />original describer thought it came from the Colorado River of that state).
<br />
<br />lit a red lateral
<br />
<br />I lips a.'1d the
<br />
<br />mooth margin,
<br />
<br />This large, bizarre sucker is native to the Colorado River Basin. In Wyoming it
<br />occurred in the Green River below Green River city before the construction of
<br />Flaming Gorge Reservoir. It was probably eliminated by chemical treatment of the
<br />Green River in 1962, but with the construction of the reservoir its specialized
<br />habitat, the torrential canyon river, was eliminated. As in the case of the Colorado
<br />squawfish, there is probably no longer a suitable habitat for this species in
<br />Wyoming.
<br />
<br />usual type of
<br />n was sent to
<br />In Museum of
<br />sides in that
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