Keynote - Marine Vertebratesearthtoreilly.com/documents/topic-6/Keynote... · 2020. 3. 26. ·...
Transcript of Keynote - Marine Vertebratesearthtoreilly.com/documents/topic-6/Keynote... · 2020. 3. 26. ·...
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CARTILAGINOUS FISH
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CARTILAGINOUS FISH• Cartilaginous Fish - fish whose entire
skeleton is composed of cartilage
• Cartilage - flexible connective tissue composed of cells and protein
• Example - the tip of your nose
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CARTILAGINOUS FISHTypes of Cartilaginous Fish
Skates RaysSharks
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CARTILAGINOUS FISH• There are as few as 700
cartilaginous fish species where as 25,000 known boney fish
• Considered the first jawed fish
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CARTILAGINOUS FISH• Cartilaginous Fish Characteristics:
• Placoid Scales - tiny teeth that are embedded in the skin that point backwards
• If you rubbed your hand from tail to head it would feel like rough sandpaper
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CARTILAGINOUS FISH• Cartilaginous Fish Characteristics: (continued)
• Visible Gill SlitsGill Slits
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CARTILAGINOUS FISH• Cartilaginous Fish Characteristics: (continued)
• Spiracles - breathing holes located on their dorsal side behind each side of the eyes
• Water enters through the spiracle holes and passes through the gill chamber
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Spiracle Holes
Spiracle Hole
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CARTILAGINOUS FISH• Cartilaginous Fish Characteristics: (continued)
• Rigid Fins - fins that allow them to glide through the water