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OsteichthyesOsteichthyes
By Mr. “I like cherry Jelly” ChapmanBy Mr. “I like cherry Jelly” Chapman
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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.
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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
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Bony FishBony Fish
•Primitive bony fishes had/have heavy scales, their paired fins are far apart on the body.
•Air bladders functioned as lungs.
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IS this fish primitive or IS this fish primitive or advanced?advanced?
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IS this fish primitive or IS this fish primitive or advanced?advanced?
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FamilyFamilytree for tree for
fishfish
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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.
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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
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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.