FISHERY BULLETIN: VOL. 69, NO. 1 



51. TETRAGONURIDAE 

 ( 6 occurrences, 7 specimens) 



Only a few specimens of Tetragonurus larvae 

 were obtained in EASTROPAC I collections. 

 Larvae of Tetragonurus have been taken rather 

 commonly in the California Current region and 

 were an important constituent in NORPAC col- 

 lections. These interesting oceanic fishes were 

 revised by Grey (1955), who recognized three 

 species. Two of these were present in the 

 EASTROPAC area: T. atlayiticiis Lowe and 

 T. cuvierl Risso. Late-stage larvae of the two 

 species can be separated by differences in their 

 meristics, and also by differences in pigmen- 

 tation and body form; larvae of T. atlayiticus 

 are more heavily and uniformly pigmented and 

 are deeper bodied than larvae of T. cuvieri 

 (Grey, 1955). 



PLEURONECTIFORMES 



(79 occurrences, 503 larvae) 



Larvae of flatfishes (Pleuronectiformes) in 

 EASTROPAC collections belonged only to the 

 families Bothidae and Cynoglossidae. Informa- 

 tion concerning the kinds and numbers of flat- 

 fish larvae taken at each of 79 EASTROPAC I 

 stations is contained in Appendix Table 6; this 

 information is summarized in Table 22. 



Flatfish larvae were taken in a broad coastal 

 band, several hundred miles wide, between Man- 

 zanillo, Mexico, and northern Peru. The occur- 



rences of some kinds of flatfish larvae and ju- 

 veniles at considerable distances from shore have 

 been commented upon by a number of workers. 

 Kyle (1913) obtained larvae of Bothus from 

 across the North Atlantic and larvae of Syacium 

 at considerable distances from shore. Bruun 

 (1937a, 1937b) described bathyj^elagic occur- 

 rences of the bothid flatfish, Chascanopsetta and 

 Monolene, the latter from off Panama, and of 

 the pleuronectid flatfish, Poecilopsetta. Ahl- 

 strom (1965) illustrated the widespread offshore 

 distribution of larvae of Citharichthys spp. in 

 the California Current region. 



54. BOTHIDAE 

 ( 56 occurrences, 199 larvae ) 



Several kinds of bothid flatfish larvae were 

 taken in 20 or more collections, including larvae 

 of Bothus leopardinus (Giinther) ,Syacium ovale, 

 and Citharichthys-Etropus. Some interesting 

 forms taken less frequently included larvae of 

 Cyclopsetta sp., Engyophrys sa7icti-laurentii 

 Jordan and Bollman, and of Monolene. A short 

 section will be devoted to each of the above. 



Bothus leopardinus ( Gunther ) ( 28 occurrences, 

 50 larvae) 



Although Norman (1934) lists three species 

 of Bothus as occurring in the eastern tropical 

 Pacific — Bothus mancus (Broussonet), B. leop- 



Table 22. — Frequency of occurrence and relative abundance of the principal kinds of flatfish larvae, Pleuronecti- 

 formes, on EASTROPAC I, summarized by vessel pattern. 



40 



