Questions and Answers
Which phylum does the class Cephalopoda belong to?
Mollusca
The Class Cephalopoda are also known as?
head foot
What is one of the most advanced groups of invertebrates?
cephalopods
The class Cephalopoda includes?
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What are characteristics of cephalopods?
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What is the function of the mantle tissue in cephalopods?
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How do most species of cephalopods rapidly move for short distances?
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To aid in escape, cephalopods?
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The cephalopod foot has become modified to form?
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How many arms does an octopus possess?
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What are the arms of an octopus lined with?
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How many arms does a squid possess?
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What are the arms and tentacles of cephalopods used for?
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What allows cephalopods to bite their prey?
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What are examples of pelagic species?
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What is an example of a benthic species?
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Pelagic species and benthic species all have a high degree of cephalization with?
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What allows the squid to be a better swimmer?
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What stiff support structure do squids possess?
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How is the mantle of a squid modified?
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Study Notes
Phylum and Classification
- Class Cephalopoda belongs to the phylum Mollusca.
- Known as "head foot," referring to their distinctive body structure.
Characteristics of Cephalopods
- Considered one of the most advanced groups of invertebrates.
- Includes species such as octopus, squid, cuttlefish, and chambered Nautilus.
- Most are active hunters and have typically lost their external shell.
Body Structure and Movement
- The mantle tissue is thickened and muscular, encasing the visceral mass for protection and enabling rapid movement.
- Utilizes jet propulsion for quick short-distance movement.
- Can release ink to obscure vision of predators during escape.
Arms and Tentacles Adaptations
- The cephalopod foot is modified into arms and tentacles.
- Octopuses possess 8 arms lined with suckers for grasping and manipulation.
- Squids have 8 short arms and 2 longer tentacles, used primarily for capturing prey.
Feeding Mechanism
- The centralized arrangement of arms surrounds a beak that allows cephalopods to bite and consume prey.
Species Types
- Pelagic species include squid, Nautilus, and cuttlefish, which live in open water.
- Benthic species such as octopus inhabit the ocean floor.
- Both groups exhibit high cephalization, characterized by well-developed eyes and a centralized nervous system.
Swimming and Support Structures
- The torpedo shape of squids enhances swimming efficiency.
- Squids possess a stiff internal support structure called a pen.
- The mantle of a squid morphs into two fins that aid in swimming.
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Description
Test your knowledge about the class Cephalopoda with these flashcards. Learn about their characteristics, members, and classification in the phylum Mollusca. Perfect for students studying marine biology or invertebrate zoology.