Form R-1 of the Diaphus rafinesquii species complex in the 

 North Pacific Ocean 



Description 



D. 12-13; A. 12-13(11);A0 5 + 4 (5), total 9-10; gill rakers 7 (6-8) + 1 + 15 (14-16), total 

 23-24 (22-25); vertebrae 33-34. 



Posterodorsal angle of operculum sharply rounded and slightly but distinctly recurved. 

 Dorsal origin over pelvic origin. Anal origin slightly behind vertical from end of dorsal base. 

 Base of adipose fin over end of anal base. 



FLO over pectoral origin and about midway between it and lateral line. VLO over bases of 

 inner pelvic rays and midway, or slightly less, from there to lateral line. VO^.s interspace 

 about 61% (57-67%) of space between VLO and VO2. SAO series in a nearly straight, steeply 

 oblique line; SAO2-3 interspace about twice that between SAO1.2. SAO,,, Pol, and Prc^ below 

 lateral line by slightly more than their diameters. First and last AOa elevated about two of 

 their diameters above level of adjacent AOa. Pol about under end of base of adipose fin. Pre 

 interspaces progressively wider, the Prca.^ interspace nearly as wide as that of Prci.3. 



Vn of males enlarged, somewhat wedge-shaped, the apex posteriorly. A small intrusion of 

 luminous tissue extends slightly into orbital rim. The apex of Vn in larger males is nearly 

 confluent with the small So. Vn of females small, narrow, well separated from the So. Lumi- 

 nous scale at PLO small, weakly formed, scarcely larger than PLO, the tissue convoluted. 



Teeth of jaws typical of diaphid species bearing an So organ. Palatines with small teeth on 

 only the anterior two-thirds, the posterior third toothless; no enlarged teeth at tips. Vomer 

 heads naked or with very few asperities. Mesopterygoids thickly set with small, sharp teeth. 



Size: To 65 mm. 



Least depth of capture: To 200 m at night. 



Distribution: Form R-1 is known only from a narrow region of the North Pacific Ocean, 

 about 30° to 40° N, 155° W to 165° E (Fig. 119). 



Form R-2 of the Diaphus rafinesquii species complex in the 

 North Pacific Ocean 



Description 



D. 12; A. 12; P. 11-12; AO 5 (6) -t- 5 (4), total 10 (9); gill rakers 8 (7-9) -I- 1 + 16 (15-17), total 

 25 (23-27); vertebrae 34. 



Posterodorsal angle of operculum rounded, not recurved. Dorsal origin slightly before a 

 vertical from pelvic organ. Anal origin behind a vertical from end of dorsal base by slightly 

 more than half the length of anal base. End of base of adipose fin distinctly behind a vertical 

 from end of anal base. 



PLO and VLO respectively a little below midway between origins of pectoral and pelvic 

 fins. SAO:i, Pol, and Prc^ usually about two of their diameters below lateral line. SAO series in 

 a slight but distinct angle, a line through anterior margins of SAOi.^ passing slightly behind 

 SAO-,; S AO2-3 interspace at least twice that of SAO 1 .-,. First AOa elevated one to one and 

 one-half times its diameter above level of second AOa; last AOa elevated by a similar amount. 

 Pol about over base of next to last anal ray and under anterior end of base of adipose fin. Pre 

 interspaces progressively wider. 



135 



