As a rule, the egg of a teleost is small, perfectly spherical, and enclosed in delicate but greatly distended membranes.
Such for example is the case in some teleost fishes, as the pickerel (Fig. 48).
The teleost is adapted to its mode of life, and to that end it is specialized in fin and skeleton rather than in brain and nerves.
This condition depends upon the relatively much shorter extent of the teleost endgut compared with the human large intestine.
Fig. 311 shows the entire intestinal tract of a teleost fish, Echelus conger, the conger eel.
Therefore it was thought that the teleost series could not have had a common origin with the series of sharks.
In the sea, whales, sharks, and teleost fishes of modern types rule in the stead of huge swimming reptiles.
It is seen that the two upper arches on each side are obliterated, as indeed they already are in some teleost fishes.
See bony fish.