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Definition: Ichthyopterygian is a group of animals that have a vertebral column and possess both spiny tentacles (also known as ichthyostegal) and gill slits. These animals are primarily found in aquatic environments, such as rivers, lakes, and oceans.
These animals can be divided into two main categories:
1.
Chelicerates
- Also known as "mollusks" or "crabs," these animals have a segmented body with tentacles