Fig. 48 — Capture localities for Myctophum aurolaternatitm in the eastern Pacific Ocean. 



Ocean). Counts for total gill rakers, AO photophores, fin rays, and vertebrae are given in Table 

 9. No significant sexual dimorphism was demonstrated in meristic characters or body propor- 

 tions in specimens from any of the geographical areas. 



The most significant differences in counts occur in the extreme eastern Pacific sector of the 

 range. Originally the data were arranged by each degree of latitude, north to south; the 

 latitudinal groupings of data in Table 9 were derived from that arrangement and appear to 

 represent natural breaks in the frequenty distributions of the various counts. These breaks 

 also appear to coincide rather well with the boundaries of the major equatorial currents, as 

 delineated by Wyrtki (1965). 



Myctophum phengodes 



(Liitken, 1892) 



Description 



D. 12-13; A. 21 (20-22); P. 15-16; AO 7 (6-8) + 8 (7-9), total 15 ( 14-16); gill rakers 7-8 + 1 + 

 17-18, total 26 (25-27); vertebrae 37 (36-38). 



Upper Pre much elevated. Eye large, 1.5 in upper jaw. Usually 4 AOp over anal base. 

 Upper margin of operculum markedly angulate and serrate in young and adults. SAO series 

 straight; SAO, a little before a vertical from VO,. AOa, often depressed below level of AOa^. 



56 



