Fish HistoryFish History

By Mr. “I love fish” ChapmanBy Mr. “I love fish” Chapman

Fish HistoryFish History

• First fossils were found about 425-500 First fossils were found about 425-500 MYAMYA

• First fish fossils came from an First fish fossils came from an Ostracoderm.Ostracoderm.

• ““Plate skin”Plate skin”

OstracodermOstracoderm

• Poorly developed Poorly developed fins and no jaw.fins and no jaw.

• First animal with a First animal with a backbone.backbone.

More InfoMore Info

• Ostracoderms Ostracoderms become extinct become extinct and two groups of and two groups of fish evolved from fish evolved from them.them.

PlacodermsPlacoderms

• First group was the Placoderms, First group was the Placoderms, which appeared about 395 MYA.which appeared about 395 MYA.

• They had thick bony plates with They had thick bony plates with paired fins.paired fins.

• Their upper jaw was fused to the Their upper jaw was fused to the skull and the lower jaw was hinged to skull and the lower jaw was hinged to the skull.the skull.

PlacodermsPlacoderms

PlacodermsPlacoderms

• Placoderms became extinct about 396 MYAPlacoderms became extinct about 396 MYA

• Class: Chondrichthyes evolved from Class: Chondrichthyes evolved from Placoderms.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

InfoInfo

• The 2The 2ndnd group to group to evolve from evolve from Ostracoderms was Ostracoderms was the Acanthodians.the Acanthodians.

• The appeared The appeared about 410 MYAabout 410 MYA

• First fish with both First fish with both jaws are movablejaws are movable

AcanthodiansAcanthodians

• Acanthodians Acanthodians evolved into Class: evolved into Class: Osteichthyes.Osteichthyes.

• Osteichthyes “Bony Osteichthyes “Bony Fish”Fish”