But the most interesting new departure is the first appearance, in the Jurassic, of bony-framed fishes (Teleosts).
"The Story of Evolution" by Joseph McCabe
Our common teleost fish, like perch and cod, appeared much later.
"The Whence and the Whither of Man" by John Mason Tyler
In various Teleosts the scales are vestigial (eel); in others (as in most electric fishes) they have completely disappeared.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3" by Various
The teleosts are a highly specialized type, adapted most perfectly to their aquatic environment.
"The Elements of Geology" by William Harmon Norton
Kocher 1997 Structure and evolution of teleost mitochondrial control regions.
Evaluating Intraspecific Variation and Interspecific Diversity: comparing humans and fish species