Ceratoscopelus townsendi 



(Eigenmann and Eigenmann, 1889) 



Fig. 193 — Ceratoscopelus townsendi, male, 43.0 mm. From Nafpaktitis and Nafpak- 



titis(1969, p. 67, fig. 78). 



Description 



D. 14(13-15); A. 13-14; P. 13-14; AO 6 (5-7) + 6 (5), total 11 (10-12); gill rakers 4 (5) -I- 1 + 

 10 (9-11), total 15 (14-16); vertebrae 36 (35-38). 



SAO series in a very slight angle, often nearly straight; anterior margin of SAO^ usually 

 touches a line through posterior margins of SAO,. o. A line through SAO> ..) passes through or 

 slightly before V0.-„ occasionally through VOj. AOar usually below level of others; AOai.^ 

 interspace often slightly greater than others of series. Last AOa often slightly elevated and 

 appearing in series with Pol. Lower Pol over or slightly before end of anal base. All AOp 

 behind end of anal base. First 3 Pre closely spaced, their interspaces slightly but progressively 

 wider, the space between Prc.3.4 nearly as great as that between Pre 1-3. 



A large and easily lost supraorbital luminous organ lies over each eye (Fig. 193), more 

 massive and robust in males. A small luminous scale present between PLO and pectoral 

 origin, and 2 or 3 scale in area between P0,.2 and PVO|. A row of several luminous scales 

 occurs before dorsal fin, on each side of the fin, and between end of dorsal fin and origin of 

 adipose fin; these scales are also easily lost. 



Size: To about 60 mm. 



Least depth of capture: Paxton (1967a) reported captures between and 20 m at night and 

 500 and 800 m in daylight in the San Pedro Basin, southern California. 



Distribution: C. townsendi may be restricted to northeastern Pacific Ocean (Fig. 194), but 

 see discussion of its systematic and spatial relationships to C. warmingii. 



Ceratoscopelus warmingii 



(Lutken, 1892) 



Description 



D. 14 (13-15); A. 14 (13-16); P. 14 (13-15); AO 6 (5-7) + 5 (4-6), total 11 (10-13); gill rakers 4 

 (5)-h 1 + 10(9-11), total 15 (14-16); vertebrae 36 (35-38). 



C. warmingii very similar to C townsendi, differing principally as diagnosed in the key to 

 species. In addition, in C. warmingii angulation of SAO series is often such that a line through 

 SAO]. 2 passes well before VO^ rather than well behind or (rarely) through. SAO:) appears to 

 be more often slightly behind vertical from origin of anal fin rather than over or slightly before 

 that origin as in C. townsendi. However, there is considerable variation and slight overlap in 

 these characters within and between the two species. 



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