Fig. 137 — Caudal region of Taaningichthys paurolychnuH, 69.0 mm, showing domed covering of the caudal luminous 

 glands. Supracaudal gland is the shorter one. 



collected southern portion. Krefft (1970), dealing only with Atlantic Ocean material, described 

 a new species, L. pontifex, from the vicinity of Cape Verde Islands, and provided a detailed 

 description and a figure of L. anomala (see Fig. 145). 



As stated by Nafpaktitis and Paxton (1968), "The genus as a whole is rather uncommon. 

 Examination of many more collections around the world will probably result in an increase in 

 the number of know species in the genus and further elucidate individual patterns of distribu- 

 tion." With this statement in mind it is deemed reasonable to present their key, including all 

 seven species, in anticipation that further collecting effort will indeed show them to occur in 

 the eastern Pacific Ocean. 



Key to species oi Lampadena 

 la. PO4 abruptly and highly elevated to over or slightly before or behind PO3 and about on 



level of PVO,, or slightly higher L. luminosa 



lb. None of the PO abruptly or highly elevated 2 



2a. VO plus SAO equals 5 to 6; AOa 3 to 4. Caudal luminous glands rather weakly developed 



and not set deeply into vertical surfaces of caudal peduncle L. anomala 



2b. VO plus SAO equals 7 to 9; AOa 5 to 7. Caudal luminous glands strongly developed and set 



deeply into vertical surfaces of caudal peduncle 3 



3a. Prci.2 interspace equal to, or greater than, three times the diameter of a photophore of 



this series 4 



3b. Prci.j interspace much shorter than three times the diameter of a photophore of this 



series 5 



4a. Last 2 (sometimes 3) AOa entirely behind base of anal fin; 2 AOp; infracaudal luminous 



gland very long, at least 1.5 times as long as least depth of caudal peduncle, almost twice 



as long as diameter of eye; crescent-shaped patch of whitish tissue on iris above pupil; 



pterotic spine directed posteriorly L. chauesi 



4b. No AOa behind base of anal fin; 4 to 5 AOp (rarely 3); infracaudal luminous gland shorter 



than 1.5 times the least depth of caudal peduncle an about 1.5 times as long as diameter of 



eye; no crescent-shaped patch of whitish tissue on iris above pupil; pterotic spine directed 



downward and forward (in specimens longer than about 30 mm) L. dea 



150 



