dorsal base 208 (191-223); length of anal base 215 (206-232); length of caudal peduncle 252 

 (224-270); depth of caudal peduncle 80 (71-88); length of supracaudal luminous gland 89 

 (71-116); length of infracaudal luminous gland 134 (109-159). 



Size: To 126 mm. 



Least depth of capture: To 370 m at night. 



Distribution: P. boschmai is presently known only from the following five localities in the 

 eastern Pacific Ocean: 02° 09' N, 84° 53' W (holotype), 08° 57' S, 107° 44' 107° 44' W (one 

 specimen), 14° 46' S, 93° 37' W (one specimen), 20° 00' N, 129° 00' W (one specimen) and 11° 

 49' N, 144° 51' W (nine specimens). 



Triphoturus Fraser-Brunner, 1949 



Five VO, 1 or more highly elevated and displaced forward. SAO markedly angulate. Two 

 Pol. PLO, VLO, SAO.i, and Pol on or a little above lateral line; upper Pre well above and behind 

 end of lateral line. Usually only 3 Pre, separate from AOp. Vn present, Dn absent. Pectoral fins 

 tiny. 



Key to species of Triphoturus in eastern Pacific Ocean 

 la. VO, and VO^ highly elevated and displaced forward to before verticals from VO2 and VO:j, 



respectively. PVO, well before vertical from PVO^ T. mexicanus (a complex) 



lb. Only VO] elevated and displaced forward to before VO.. PVOj almost directly below 



PVO2 T. nigrescens 



Triphoturus mexicanus species complex 

 (Gilbert, 1890) 



Fig. 154 — Triphoturus mexicanus. From Bolin (1939, p. 136, fig. 21J, 



Description 



PLO below but nearly touching lateral line; all other upper photophores a little above 

 lateral line. PO4 and SAO,.j about on a straight line that passes well above VO^ and VO3. 

 SAO, well behind a vertical from VO4. Infracaudal luminous gland long, reaching to, or nearly 

 to, end of anal base. 



The outline sketch (Fig. 154) is representative of all forms, since all are superficially very 

 similar. 



In the eastern Pacific, two species and a probable subspecies are found, based primarily on 

 numbers of gill rakers and vertebrae (Table 27). Moser and Ahlstrom (1970, p. 114) stated 

 that, based on distinctiveness of the larvae, the southern form is referrable to Triphoturus 

 oculeus (Carman, 1899). 



164 



