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Fish Classification and Anatomy Quiz

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Questions and Answers

What is the main difference between Actinopterygii and Sarcopterygii?

Actinopterygii have fins supported by rays and robust internal skeletons, while Sarcopterygii have fins supported only by rays.

Actinopterygii have fins supported only by robust internal skeletons and rays, while Sarcopterygii have fins supported by rays.

Actinopterygii have fins supported by robust internal skeletons and rays, while Sarcopterygii have fins supported only by rays.

Actinopterygii have fins supported only by rays, while Sarcopterygii have fins supported by robust internal skeletons and rays. (correct)

Which of the following is a synapomorphy of Osteichthyes?

Lepidotrichia

Endoskeleton made of endochondral bone (correct)

Lungs

Bony operculum that covers the gill slits

What is the function of the operculum in Osteichthyes?

It covers the gill slits (correct)

It provides electroreception

It supports the fins

It protects the internal organs

What are Ganoid scales?

<p>Rhomboid shaped scales covered by dentine and ganoin, with peg and socket articulation</p> Signup and view all the answers

What is the function of the Ampullae of Lorenzini?

<p>Electroreception</p> Signup and view all the answers

Study Notes

Characteristics of Fish Groups

Actinopterygii (Ray-finned Fish) and Sarcopterygii (Lobe-finned Fish) differ in the structure of their fins: Actinopterygii have ray-like fins, while Sarcopterygii have lobe-like fins.

Osteichthyes (Bony Fish)

A synapomorphy of Osteichthyes is the presence of a bony skeleton.
The operculum is a bony flap that covers the gills, protecting them and allowing for more efficient gas exchange.

Scales and Sensory Organs

Ganoid scales are thick, bony scales found in some ancient fish and some modern species, providing protection and reducing drag.
The Ampullae of Lorenzini are specialized electroreceptors found in the snouts of some fish, allowing them to detect electric fields generated by prey or predators.

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Description

Test your knowledge of fish classification and anatomical features with this quiz! Learn about the main difference between Actinopterygii and Sarcopterygii, as well as the synapomorphies of Osteichthyes. Challenge yourself and become an expert in fish biology!