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FISHERY BULLETIN: VOL. 69, NO. 1 

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Figure 5. — Distribution of larvae of the gonostomatid Cyclothone spp. on EASTROPAC I. Collections of 1 to 

 25 larvae are shown as circles with dot in center, collections of 26 or more larvae as large solid circles; neg- 

 ative hauls are shown as small solid circles. 



Vinciguerria spp. (422 occurrences, 18,740 

 larvae ) 



Larvae of Vinciguerria occurred in more hauls 

 than those of any other genus and ranked sec- 

 ond in abundance to the myctophid genus Dio- 

 genichthys. The distribution of Vinciguerria 

 larvae is shown in Figure 6. Although most 

 of the material unquestionably is V. bicetia 

 (Garman) , some of the collections from offshore 

 and particularly from the central South Pacific 

 water mass between lat 5° and 20° S represent 

 V. nimbaria (Jordan and Williams) . The larvae 

 of V. nimbaria are indistinguishable from those 



of V. lucetia (Ahlstrom and Counts, 1958), 

 hence identification must be made on meta- 

 morphosing specimens, juveniles, and adults. 

 The two species are closely allied, but readily 

 separable from V. poweriae (Cocco) and V. 

 attenuata (Cocco), the other two species of 

 Vinciguerria, at all stages of development. A 

 trenchant difference between the two "pairs" 

 of species is the development of a pair of sym- 

 physeal photophores under the lower jaw in V. 

 lucetia and V. nimbaria and the absence of this 

 pair in V. poweriae and V. attenuata. The two 

 characters most readily used for distinguishing 



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