OsteichthyesOsteichthyes

By Mr. “I like cherry Jelly” ChapmanBy Mr. “I like cherry Jelly” Chapman

OsteichthyesOsteichthyes

•There are approximately 25,000 species of bony fishes worldwide.

• If all of the living species in all of the other vertebrate classes were added up, the sum total would be less than the number of bony fishes.

Fish CharacteristicsFish Characteristics

• All bony fish haveAll bony fish have::

• Bony skeletonBony skeleton

• 2 chamber heart 2 chamber heart

• Cold bloodedCold blooded

• scalesscales

• Lateral lineLateral line

Bony FishBony Fish

•Primitive bony fishes had/have heavy scales, their paired fins are far apart on the body.

•Air bladders functioned as lungs.

IS this fish primitive or IS this fish primitive or advanced?advanced?

IS this fish primitive or IS this fish primitive or advanced?advanced?

FamilyFamilytree for tree for

fishfish

Types of ScalesTypes of Scales

• Scales – thin bony Scales – thin bony plates that overlap plates that overlap each other and each other and provide protection.provide protection.

• Glands on the Glands on the scales produce a scales produce a slimy mucus, which slimy mucus, which protects them from protects them from bacteria.bacteria.

Types of ScalesTypes of Scales

• There are four There are four types of scales:types of scales:

• 1. Placoid – type of 1. Placoid – type of scales on sharksscales on sharks

• 2. Ganoid – scales 2. Ganoid – scales are connected to are connected to each other (like each other (like armor). Ex. Is a Gararmor). Ex. Is a Gar

ScalesScales• 3. Cycloid – have 3. Cycloid – have

smooth surfaces smooth surfaces and edges.and edges.

• 4. Ctenoid – are 4. Ctenoid – are like cycloid scales, like cycloid scales, but have but have sharp/rough edges sharp/rough edges that stick out.that stick out.