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Jawless Fish Jawless Fish Guide: Types, Habitat, Characteristics & Uses Introduction When you think of fish, you probably imagine creatures with jaws, fins, and scales. But long before modern fish evolved, there existed a much simpler—and fascinating—group known as jawless fish. Scientifically called Agnatha, these ancient vertebrates represent the earliest stage of fish evolution. Jawless…

Bony Fish Bony Fish: Characteristics, Types, Classification & Examples Introduction  Most people can’t tell you what actually separates a goldfish from a shark, and that gap in understanding makes fish biology feel more confusing than it needs to be. Here’s the good news: once you understand one core distinction, everything else clicks into place. A…