appear to be L. ritteri have been made to 153° W at about 37° N. The species has not been 



reported from outside these limits. 



Discussion 



L. ritteri appears to be most closely related to L. fernae. It differs, in part, in certain 

 meristic characters (Table 28) and in having a shorter infracaudal luminous gland and a 

 generally more robust body (Table 29). 



Table 28. Correlated Counts of Dorsal and Anal Fin Rays, AO Photophores, and 

 Gill Rakers for Lampanyctus fernae and L. ritteri (counts underlined). 



AOa 



Upper 

 rakers 



Anal fin rays 



AOp 



1 



22 7 



257 



2 



6 



21 9 



120 



73 



39 



7 



10 



Lower rakers (including central raker) 



9 10 11 12 13 



130' tdO' 



LiMBERTS ftZlMuTHAL EOUfiL-AREA PRO JEC T lO 



Fig. 158 — Capture localities for Lampanyctus ritteri (many eastward of curved line), L. fernae (open squares) and L. 



regalis (open circles). 



171 



