History of fish notes

These are your notes for fish history

1. Fish HistoryFish History
By Mr. “I love fish” ChapmanBy Mr. “I love fish” Chapman

2. Fish HistoryFish History
•First fossils were found about 425-500 MYAFirst fossils were found about 425-500 MYA
•First fish fossils came from an Ostracoderm.First fish fossils came from an Ostracoderm.
•““Plate skin”Plate skin”

3. OstracodermOstracoderm
•Poorly developed fins Poorly developed fins
and no jaw.and no jaw.
•First animal with a First animal with a
backbone.backbone.

4. More InfoMore Info
•Ostracoderms become Ostracoderms become
extinct and two extinct and two
groups of fish evolved groups of fish evolved
from them.from them.

5. PlacodermsPlacoderms
•First group was the Placoderms, which First group was the Placoderms, which
appeared about 395 MYA.appeared about 395 MYA.
•They had thick bony plates with paired They had thick bony plates with paired
fins.fins.
•Their upper jaw was fused to the skull and Their upper jaw was fused to the skull and
the lower jaw was hinged to the skull.the lower jaw was hinged to the skull.

6. PlacodermsPlacoderms

7. PlacodermsPlacoderms
•Placoderms became extinct about 396 MYAPlacoderms became extinct about 396 MYA
•Class: Chondrichthyes evolved from Placoderms.Class: Chondrichthyes evolved from Placoderms.
•ChondrichthyesChondrichthyes
–Chondra means ”cartilage”Chondra means ”cartilage”
–Ichthyic means ‘fish”Ichthyic means ‘fish”
•Cartilaginous fish: 350 species Cartilaginous fish: 350 species
•(most sharks)(most sharks)
•Ex. Sharks, Rays, SkatesEx. Sharks, Rays, Skates

8. InfoInfo
•The 2The 2
ndnd
group to group to
evolve from evolve from
Ostracoderms was the Ostracoderms was the
Acanthodians.Acanthodians.
•The appeared about The appeared about
410 MYA410 MYA
•First fish with both First fish with both
jaws are movablejaws are movable

9. AcanthodiansAcanthodians
•Acanthodians evolved Acanthodians evolved
into Class: into Class:
Osteichthyes.Osteichthyes.
•Osteichthyes “Bony Osteichthyes “Bony
Fish”Fish”