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Questions and Answers
What is the Class Agnatha known for?
What is the Class Agnatha known for?
- Bony fish
- Jawless fish (correct)
- Predators
- Cartilaginous fish
How many known species are there in Class Agnatha?
How many known species are there in Class Agnatha?
75
What type of body do scavengers in Class Agnatha have?
What type of body do scavengers in Class Agnatha have?
Snake-like
What is the characteristic of cartilaginous fish?
What is the characteristic of cartilaginous fish?
How many known species are there in cartilaginous fish?
How many known species are there in cartilaginous fish?
What is the primary feeding behavior of cartilaginous fish?
What is the primary feeding behavior of cartilaginous fish?
What class do cartilaginous fish belong to?
What class do cartilaginous fish belong to?
What are the skin features of cartilaginous fish?
What are the skin features of cartilaginous fish?
What is the Class Osteichthyes known for?
What is the Class Osteichthyes known for?
How many known species are there in bony fish?
How many known species are there in bony fish?
What type of skeleton do bony fish have?
What type of skeleton do bony fish have?
What is bone composed of?
What is bone composed of?
What organ do bony fish have for buoyancy?
What organ do bony fish have for buoyancy?
What are the two groups of bony fish?
What are the two groups of bony fish?
Describe lobe-finned fish.
Describe lobe-finned fish.
What defines ray-finned fish?
What defines ray-finned fish?
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Study Notes
Class Agnatha
- Comprises jawless fish.
- Contains 75 known species; notable examples include lampreys and hagfish.
- Characterized by scavenger behavior and a snake-like body structure.
Cartilaginous Fish
- Features a skeleton composed of cartilage, which offers flexibility and toughness.
- Contains approximately 850 known species, including sharks and rays.
- Predominantly exhibits predatory behavior within aquatic ecosystems.
- Classified under Class Chondrichthyes.
- Skin texture includes tooth-like projections called denticles, providing protection and minimizing drag in water.
Bony Fish
- Belongs to Class Osteichthyes, the largest and most diverse class of fish.
- Boasts over 21,000 known species, thriving in various aquatic environments.
- Possesses an endoskeleton made of calcified cartilage termed bone, enhancing structural strength.
- Exhibits a swim bladder, an internal organ that provides neutral buoyancy, assisting in stability while swimming.
Swim Bladder
- Functions as an internal organ that regulates buoyancy, facilitating movement at different water depths.
Groups of Bony Fish
- Divided into two main categories: lobe-finned and ray-finned.
- Lobe-finned Fish: Recognized as primitive with thick muscular fins that can be used briefly for walking on land.
- Ray-finned Fish: Characterized by fins supported by long bones that radiate outward, resembling rays of sunlight.
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