Class Notes (834,048)
Canada (508,296)
Lecture 20

Lecture 20 - Evolution of Fish

2 Pages
97 Views
Unlock Document

Department
Earth Sciences
Course
Earth Sciences 1083F/G
Professor
Cameron Tsujita
Semester
Fall

Description
Lecture 20Evolution of Fishes y Origin of Fish o Origin of fishes can be traced to the first chordates o Lacked a backbone but possessed a flexible rod of tissue called a notochord o Have the basic wormlike body plan muscle packs and a pharynx y General Picture o Earliest fishes were jawless o Jawed fishes arose from jawless fishes o The diversity of major fish groups peaked in the Devonian PeriodThis period is therefore often referred to as The Age of Fishes y First True Fishes Jawless Fishes Agnatha o Ostracoderms ancient armoured forms o Range CambrianCarboniferous o Had heavy external armour but a soft cartilaginous internal skeleton o Representatives of the jawless fishes have
More Less

Related notes for Earth Sciences 1083F/G

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit