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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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Description
Explore the world of Agnatha, the fascinating jawless fish. This quiz features key terms and definitions such as Hagfish and their unique characteristics. Test your knowledge on these primitive creatures and their adaptations in the aquatic environment.
