Podcast
Questions and Answers
Which group of fish is the most primitive?
Which group of fish is the most primitive?
- Agnathans (correct)
- Superclass
- Chondrichthyes
- Osteichthyes
Which two fish are the only surviving agnaths today?
Which two fish are the only surviving agnaths today?
- Agnathans and Chondrichthyes
- Lamprey and hagfish (correct)
- Skates and saw
- Sharks and rays
What is the main characteristic of Agnathans?
What is the main characteristic of Agnathans?
- They have paired fins
- They have no jaws (correct)
- They have movable mouths
- They have large gills
What is the main characteristic of Chondrichthyes?
What is the main characteristic of Chondrichthyes?
Which fish group consists of sharks, rays, and skates?
Which fish group consists of sharks, rays, and skates?
Superclass Agnatha This group is the most primitive of the three groups of fish. The fish belonging to this group have no ______.
Superclass Agnatha This group is the most primitive of the three groups of fish. The fish belonging to this group have no ______.
Members of this group were generally small and heavily ______ and lacked paired fins.
Members of this group were generally small and heavily ______ and lacked paired fins.
They moved along the bottom of the sea where they preyed upon a variety of ______.
They moved along the bottom of the sea where they preyed upon a variety of ______.
The only surviving agnaths today are lampreys (class Cephalaspidiformes) and ______ (class Myxini).
The only surviving agnaths today are lampreys (class Cephalaspidiformes) and ______ (class Myxini).
Chondrichthyes is diverse, consisting of ______, rays, and skates, together with saw.
Chondrichthyes is diverse, consisting of ______, rays, and skates, together with saw.
Study Notes
Major Classifications of Fish
- There are three major groups of living fish: Agnathans, Chondrichthyes, and Osteichthyes.
Agnathans
- Most primitive group of fish, characterized by the absence of jaws.
- Mouths are like holes in their heads, lacking movable parts.
- Generally small, heavily armored, and lacking paired fins.
- Moved along the sea bottom, preying on arthropods.
- Large gills served as food filters and respiratory organs.
- Only surviving agnaths today are lampreys (Cephalaspidiformes) and hagfishes (Myxini).
Characteristics of Lampreys and Hagfishes
- Slimy, lacking scales or armor.
- Elongated, eel-like bodies.
- Hagfishes are known for producing slime.
Class Chondrichthyes
- Diverse group consisting of sharks, rays, skates, and sawfish.
- A separate classification from Agnathans.
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Description
Test your knowledge on the major classifications of fish, including Agnathans, Chondrichthyes, and Osteichthyes. Explore the characteristics and distinguishing features of each group in this informative quiz.
