Definition: The word "Amblycephalidae" was a group of small fish, known as "amblycephalus," that lived in the ocean and were thought to be the earliest forms of fish. These fish are characterized by their long, flexible bodies with two heads, one placed at each end. The name comes from Greek "ambly" meaning "two-lobed" or "long", and "cephalus" which means head. The definition of Amblycephalidae is that they are a group of small fish, typically found in the ocean, that lived around 50 million years ago. They had two long heads - one placed at each end - that were flexible and could be manipulated to move along the body. These early fish are known for their unique adaptations, including the ability to "ambly" or swivel their bodies and use their tails as manipulatives, which helped them in various forms of life.

Amblycephalidae