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(co.)
<br />(17/46), nd four species of cary-ophyllid cestodes: Glaridacris confusus Hunter, The first specimer
<br />1927 (33/46); Biacetabulum giganteum Hunter, 1929 (4/46); Monobothrium the Colorado River
<br />
<br />ingens Hunter, 1927 (3/46); and Pseudolytocestus differtus Hunter, 1929 (5/46), ,
<br />specimen was collect
<br />were found in 78% (35/46) of the total fish sampled. Biacetabulum giganteum, after the impoundm
<br />M. ingens, and P. differtus represent new distributional records for Arkansas. comm.). Hybrid spe
<br />I am indebted to Dr. John S. Mackiewicz who assisted and identified speci- were taken from tbi
<br />mens.-Morris Mauney, Jr., Fisheries Science, Virginia Polytechnic Institute and and by Suttkus et a
<br />State University, Blacksburg, VA 24061. sidered this species
<br /> Rapids (Colorado Riv
<br />RECENT COLLECTIONS OF THE COLORADO RIVER SQUAWFISH AND These recent colt
<br />RAZORBACK SUCKER FROM THE SAN JUAN AND COLORADO RIVERS Colorado and San Ju,
<br />IN NEW MEXICO AND ARIZONA.-The native fishes of the American South- and (3) illustrate tl
<br />west represent a depauperate fauna, many members of which are currently listed -many areas through
<br />by state or federal authorities as endangered and threatened, or are currently exotic introductions a
<br />proposed for such listings. This note presents information on 1978 collections of This research was
<br />two of these species, the Colorado River squawfish and the razorback sucker, from CX821070012) ; the B
<br />the Colorado River Basin. X0026); and by VT
<br />The Colorado River squawfish, Ptychocheilus lucius, was once quite common Reclamation, Amarill
<br />throughout the Colorado River drainage. Currently, it is considered extinct ill Northern Arizona. Rc
<br />the lower Colorado River Basin (Minckley and Deacon, Science 159:1424-1432,
<br />1968) and rare in the upper basin (Holden and Stalnaker, Trans. Am. Fish Soc.
<br />THE ASSOCIATE
<br />104:217-231, 1975). During April 1978, one juvenile Colorado River squawfi!z!' = TIONAL WILDLIF
<br />was collected from the San Juan River, 8 river km downstream from Aneti:.
<br />SNAIL, NA
<br />Utah, below the confluence of the San Juan River and McElmo Creek. Th., Wildl. Refuge, , Hida]
<br />specimen, which was photographed and released, was 177 mm in total lengO, families (Table 1). F
<br />and weighed 36 g. This represents the first record of this species from the mo -„ the N boundary of tl:
<br />stream San Juan River since 1965. - Parks Wildl. 34[10
<br />Historical records of this species from the San Juan include early works .`" uncinatus) feeding h
<br />Jordan (Bull. U.S. Fish Comm. 89:1-40, 1891) and Evermann and Ruttner (Bi shells from beneath
<br />U.S. Fish Comm. 14:473-486, 1895). More recent records of this species far Mus. Nat. Hist. (DA
<br />this river are two specimens reported by Koster (Southwest. Nat. 5:174-1 _ ton (Dallas Mus. Ni
<br />1960), taken near Rosa, Rio Arriba Co., New Mexico; four adults from the S " Nat. Hist. Bull. 1[1]
<br />Juan River in 1961 (Olson, Fed. Aid Proj. F-22-11-3, New Mexico Game and F' 1973), Fullington and
<br />Dep., 1962); four juveniles collected at Mexican Hat, Utah, in 1961 (Sigler Burch (How to know
<br />Miller, Utah Dep. Game and Fish, 1963) and one specimen near Bloomfi. Live terrestrial ga<
<br />New Mexico (Olson, Sec. 8, Proj. Nos. A-2, A-3, New Mexico Dep. Game 1977 many extant spi
<br />Fish, 1965). There are also several reports of anglers taking adults of this spe in drier periods. Addi
<br />from the San Juan arm of Lake Powell as recently as 1977 (Bill Silvey, 1, conditions likely will
<br />commun., Arizona Game and Fish Dep.). ;Fulling-ton and Pre
<br />The razorback sucker, Xyrauchen tetanus, was once quite abundant in Helicina orbiculata (:
<br />Colorado River system (Minckley, Arizona Game and Fish Dep., 1973). Cur_. 21 Nov. 1976, while
<br />ly, they are essentially extinct in the lower Colorado River, below Lake Moi a number of inactive
<br />although adult fish do still exist in large numbers in Lake Mohave, and in si in Delta counties in 3
<br />er numbers in Lake Mead. and deposited in the D
<br />During June 1978, we collected one adult razorback sucker 100 m upst_ . Helicina orbiculata
<br />from the mouth of the Paria River. Two other specimens were observed but "
<br />peared to be spawning. This repre"tiZJ s
<br />The fish
<br />a gravid female
<br />not ca
<br />tured
<br />a caule (Benth.) Conti.
<br />,
<br />,
<br />p
<br />p
<br />. of H. orbiculata in )
<br />the third known specimen of this species from this region. Af siderable time on tree
<br />686
<br />S . VOL- 090
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