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<br />Description.-Crenichthys baileyi thermophilus is the smallest subspecies of C. baileyi.
<br />Adult specimens of this subspecies average near 30 mm SL. Median fins are relatively
<br />posterior in position, resulting in a reduced anal to caudal length. (Fig. 4).
<br />Meristics and Morphometrics.- The following values are based on 30 Crenichthys
<br />baileyi (20 male, 10 female) from Mormon Spring, 26.3-45.0 mm SL. Typical fin ray
<br />numbers: dorsal 10, anal 12, caudal 18, and left pectoral 16 (Table 3). Lateral line scales
<br />typically 28 and caudal peduncle circumference scales 16 or 17 (Table 4). Predorsal
<br />length: ~ 728.80 (701-767), ~ 731.70 (711-760). Anal to caudal length: ~ 326.60
<br />(303-354), ~ 313.30 (302-326). Greatest body depth: ~ 320.70 (292-361), ~ 297.10
<br />(265-316). Greatest body width: ~ 212.85 (201-224), ~ 211.70 (200-224). Head length:
<br />~ 317.90 (299-356), ~ 324.30 (305-342). Head depth: is 249.25 (231-274), ~ 245.90
<br />(234-253). Head width: ~ 227.20 (214-247), ~ 232.40 (222-253). Least bony interorbital
<br />width: ~ 147.00 (131-160), ~ 143.70 (129-151). Snout length: is 87.85 (74-103), ~
<br />90.10 (82-99). Orbit length: ~ 78.05 (64-89), ~ 81.20 (71-93). Depresseddorsal fin length:
<br />is 213.20 (190-229), ~ 206.40 (198-221). Depressed anal fin length: ~ 220.70 (189-255),
<br />~ 214.40 (197-226). Middle ray caudal fin length: ~ 201.80 (183-214), ~ 207.70
<br />(197-225). The following vertebral counts are based on 20 specimens (UMMZ M 124987),
<br />with frequency of each count given in parenthesis; precaudal: 11(2), 12(13), 13(5), avg.
<br />12.2; caudal: 15(3),16(11),17(5),18(1), avg. 16.6; total: 26(1),27(1),28(7),29(11), avg.
<br />28.4.
<br />Etymology.- The name thermophilus is from the Greek therme, warm, and philos,
<br />having an affinity for, in reference to the subspecies inhabiting warm spring waters.
<br />
<br />Crenichthys baileyi grandis, n. subsp. Hiko White River springfish (Fig. 9).
<br />
<br />Diagnosis.- This subspecies differs from other C baileyi subspecies in being of large
<br />size (adults average longer than 40 mm SL). Crenichthys b. grandis differs from C. b.
<br />albivallis in having a longer head (Fig. 2). Crenichthys b. grandis differs from C. b.
<br />thermophilus and C. b. baileyi in possessing more dorsal and anal fin rays (Table 3).
<br />Crenichthys b. grandis can be distinguished from C. b. moapae and other C. baileyi
<br />subspecies on the basis of color. Males of C. b. grandis have much more yellow than any
<br />other C. baileyi subspecies. The ventral surface of head and body of the males are brilliant
<br />lemon yellow. This color extends onto the caudal fin, becoming deep orange.
<br />Type Material.-Holotype, male (UMMZ 203336), 45.5 mm SL and allotype (UMMZ
<br />203337),45.4 mm; collected 3-4 Jun. 1966 by J. E. Deacon from Hiko Spring along with
<br />29 paratopotypes ASU-3942 (31.3-65.5 mm). Additional paratopotypes collected from
<br />Hiko Spring as follows: 44, UNLV-142 (26.4-40.3 mm) collected 4 Jun. 1964 by J. E.
<br />Deacon; 40, UMMZ 124998 (part of a collection of 1626 specimens 13.0-71.0 mm)
<br />collected 28 Aug. 1938 by C. L. Hubbs.
<br />Distribution.-Crenichthys b. grandis inhabits Hiko Spring (T 4 S, R 60 E, Sec 14) and
<br />Crystal Spring (T 5 S, R 60 E, Sec 10), in Pahranagat Valley, Lincoln Co., Nevada.
<br />Species Associates and Status.- Two native fishes, Gila robusta ;ordani and
<br />Rhinichthys osculus velifer, were associated with C. b. grandis in Hiko Spring. This
<br />springfish population became extinct in 1967 after largemouth bass, shortfin mollies, and
<br />mosquitofish became established in Hiko Spring. Largemouth bass apparently invaded
<br />Hiko Spring by swimming up the irrigation ditch flowing into a reservoir on the Key
<br />Pittman Wildlife Management Area. Shortfin mollies and mosquitofish probably were
<br />introduced directly into Hiko Spring. Gila robusta ;ordani. Rhinichthys osculus velifer,
<br />and Catostomus clarki intermedius were associated with C. b. grandis in Crystal Spring
<br />(C. L. Hubbs' field notes). Recently, Cichlasoma nigrofasciatum has become established
<br />in Crystal Spring, resulting in reduced numbers of springfish.
<br />Description.-Crenichthys b. grandis is the largest subspecies of C. baileyi. Adult
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