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Questions and Answers
What is Agnatha known for?
What is Agnatha known for?
- Having jaws and paired fins
- Lacking both jaws and paired fins (correct)
- Having bones in their body
- Being cartilaginous (correct)
What do Agnathans use to pierce into the side of a host fish?
What do Agnathans use to pierce into the side of a host fish?
circular toothed outgrowth
Which of the following statements about Hagfish is true?
Which of the following statements about Hagfish is true?
- They possess a long dorsal fin.
- They have powerful jaws.
- They have a smooth body without fins.
- They are scavengers. (correct)
How many rows of teeth do Hagfish have in their mouth?
How many rows of teeth do Hagfish have in their mouth?
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What characteristic is true for Lampreys?
What characteristic is true for Lampreys?
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What unique eye feature do Lampreys possess?
What unique eye feature do Lampreys possess?
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Study Notes
Agnatha (Jawless Fish)
- Agnathans are characterized by the absence of jaws and paired fins.
- Their mouths feature circular toothed outgrowths for piercing and sucking nourishment from host fish.
- Composed entirely of cartilage, Agnathans lack true bones.
- Two main groups exist within the Agnatha classification.
Hagfish
- Known for their unique behavior of tying themselves into knots to help shed their slime coat.
- Possess four rows of keratinized teeth in their mouths, aiding in scavenging.
- Primarily scavengers, they feed on decaying organic matter.
Lamprey
- Resemble eels and are identifiable by seven gill openings.
- Display a subtle median fin that becomes more pronounced in males during breeding.
- Utilize suckers to attach to hosts, leading to a parasitic lifestyle.
- Feature small but functional eyes, as well as a third pineal eye that plays a role in sensory perception.
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