Cephalopoda Class Flashcards

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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?

octopus, squid, cuttlefish, and the chambered Nautilus Signup and view all the answers

What are characteristics of cephalopods?

they are all active hunters and most have lost their shell Signup and view all the answers

What is the function of the mantle tissue in cephalopods?

aid in protection and allow for rapid movement Signup and view all the answers

How do most species of cephalopods rapidly move for short distances?

jet propulsion Signup and view all the answers

To aid in escape, cephalopods?

release ink into the jet of water obscuring the vision of a potential predator Signup and view all the answers

The cephalopod foot has become modified to form?

arms and tentacles Signup and view all the answers

How many arms does an octopus possess?

8 arms Signup and view all the answers

What are the arms of an octopus lined with?

suckers Signup and view all the answers

How many arms does a squid possess?

8 short arms and 2 long tentacles Signup and view all the answers

What are the arms and tentacles of cephalopods used for?

catching prey Signup and view all the answers

What allows cephalopods to bite their prey?

a birdlike beak Signup and view all the answers

What are examples of pelagic species?

squid, Nautilus, cuttlefish Signup and view all the answers

What is an example of a benthic species?

octopus Signup and view all the answers

Pelagic species and benthic species all have a high degree of cephalization with?

well developed eyes and a centralized nervous system Signup and view all the answers

What allows the squid to be a better swimmer?

its torpedo shape Signup and view all the answers

What stiff support structure do squids possess?

pen Signup and view all the answers

How is the mantle of a squid modified?

to form two fins for swimming Signup and view all the answers

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.