Electrona 



Goode and Bean, 1896 



Lateral line well developed. PLO and PVOi.j form a nearly right-angled triangle, SAO 

 series slightly to markedly angulate. Last few photophores behind end of anal base often below 

 level of preceding ones. 



The following key to species and illustrations of Electrona are taken largely from An- 

 driashev, 1962. 



Key to species of Electrona 



la. Body short, deep, its depth about 3 in its length. SAO series about equally spaced, straight 

 or very slightly angulate. AO 12 (10-13) E. risso 



lb. Body relatively elongate, its depth much more than 3 in the length. SAOi.j interspace 

 distinctly greater than that of SAO0.3 2 



2a. So (posteriorly displaced Vn) present about under midorbit. SAO.t nearer SAO^ than to 

 lateral line. Gill rakers 9-10 + 1 + 21-23, total 31-34. About 3 AO behind end of anal 

 base E. carlsbergi 



2b. So present 3 



3a. SAO series only moderately angulate. Exposed margins of all scales smooth. PO5 

 not elevated. Four or 5 behind end of anal base. Gill rakers 4-5 -1- 1 -I- 12-14, total 

 17-20 E. antarctica 



3b. SAO series strongly angulate. Exposed margins of scales more or less crenulate. PO5 

 slightly but distinctly elevated. One or 2 AO photophores over end of anal base, slightly 

 but distinctly raised 4 



4a. Exposed margins of all scales notably crenulate. Upper jaw barely reaching to a vertical 

 from rear margin of orbit. Total gill rakers 29 (27-31) E. subaspera 



4b. Exposed margins of scales of lateral line only are notched at center, with weak crenula- 

 tions above and below. Upper jaw reaching to well behind a vertical from rear margin of 

 orbit. Total gill rakers 20-23 E . paucirastra 



Electrona carlsbergi 



(Taning, 1932) 



Fig. 15 — Electrona carlsbergi. female, 72.5 mm. From Andriashev (1962, p. 244, fig. 



20). 



Description 



D. 13-14; A. 19 (18-20); P. 11-13 (long, narrow, reaching to vent); AO 13-15; gill rakers 

 9-10 -t- 1 + 21-23, total 31-34; vertebrae 35-37. 



Small suborbital organ (So) present below about midorbit (a greatly displaced Vn). SAO3 

 nearer SAO2 than to lateral line; 2 Pre half a diameter or less apart. More than 30 small 



27 



