30 



ONTOGENY AND SYSTEMATICS OF FISHES-AHLSTROM SYMPOSIUM 



0.76-0.80 



Mugil cephalus 



B 



1.7x1.9 



Cololabis saira 



1.54x1.68 



Ostraciidae 



1.35-2.05 



Sardinops sagax 



2.93 



Chauliodus macouni 



1.07-1.18 



Merluccius productus 



H 



2.0 



Eumicrotremus orbis 



2.65-2.90 



Trachipterus altivelus 



0.88 



Stomias atri venter 



Fig. 14. Fish eggs. Captions under each illustration indicate the species and the diameter or dimensions of the egg in millimeters. A. Mugil 

 cephalus. original; B. Cololabis saira. original; C. Ostraciidae, original; D. Sardinops sagax. original; E. Chauliodus macouni. original; F. Merluccius 

 productus. from Ahlstrom and Counts ( 1 955); G. Eumicrotremus orbis. from Matarese and Borton unpubl. MS; H. Trachipterus altivelus. original; 

 and I. Stomias aim-enter, original. 



grated lo their actual destinations (Snyder, 1981). As seen in 

 the cyclopterid, Eumicrotremus. most late-stage demersal em- 

 bryos resemble the newly hatched larva with respect to all char- 

 acters (Fig. 1 4G). The morphology of the head, gut, and postanal 



body as well as the number of myomeres is used for identifi- 

 cation within all tish egg groups. A number of specialized char- 

 acters associated with the embryo are essential for identification 

 when present, e.g., elongated fin rays— J'rachiplerus (Fig. 14H), 



