31b. 



32a. 



32b. 



at PLO elliptical to triangular in shape, its length slightly greater than diameter of 



pupil, the tissue nearly vertically striated D. elucens 



Least depth of caudal peduncle 417c (40-42%) of length of peduncle. Body rather slender, 

 its depth at pectoral origin 20% (19-21) of SL. Total gill rakers 25-26. Luminous scale at 

 PLO vertically elliptical in shape, its length slightly greater than diameter of pupil, the 



tissue nearly horizontally striated D. gigas 



Vn not reaching to under orbital rim. SAO3 and Pol several of their diameters below 

 lateral line. PLO and VLO about midway between lateral line and pectoral and pelvic 

 bases. Posterodorsal margin of operculum moderately lobed and recurved. Photophores 

 notably small. Luminous scale at PLO nearly equal to vertical diameter of pupil, the 



tissue in short, vertical lines D. ostenfeldi 



Vn greatly elongated to under orbital rim and ending in a distinct knob about under hind 

 margin of pupil. SAO.j and Pol at lateral line. PLO and VLO much nearer lateral line 

 than to pectoral and pelvic origins. Posterodorsal margin of operculum strongly lobed 

 and recurved. Photophores notably small. Luminous scale at PLO about half the pupil in 

 size, the tissue convoluted D. metopoclampus 



DiaphusdumerJIij 



(Bleeker, 1856) 



Fig. 85 — Diaphus dumerilii. female, 58.0 mm. 



Description 



The following data are taken from specimens from off Cabo Corrientes, Cuba. 



D. 14; A. 15 (16); P. 12-13; AO 7 (6) + 5 (6), total 12 (13); gill rakers 6 -I- 1 -I- 14 (six 

 specimens); vertebrae 36 (35-37). 



Dn and Vn of females small, inconspicuous. Dn of males much enlarged dorsally, and 

 elongated, reaching to about lower margin of nasal apparatus; Vn of males tiny. PLO much 

 nearer lateral line than to pectoral base; VLO about midway between pelvic base and lateral 

 line. First AOa not elevated, last AOa but slightly so. 



Size: To about 80 mm. 



Least depth of capture: At surface at night. 



Distribution: This species was not found among the extensive material examined for this 

 study, and its occurrence in the eastern Pacific is doubtful, although Beebe and Vander Pyl 

 (1944) reported it from off Acapulco, Mexico, and Fowler (1928) reported it from near Hawaii; 

 the type locality is in the Malay Archipelago. Nafpaktitis(1968) reported the species as 

 abundant in the tropical North Atlantic. Diaphus dumerilii is either very rarely taken in the 

 eastern Pacific or the identifications from there are erroneous. 



102 



