👉 The term "ichthyyoidea" is a genus of marine fish that includes several families and genera. It is derived from the Greek words "ichthyos" meaning "fish" and "doi" which means "idea". The ichthyosauridae, for example, are known for their large size, long necks, and powerful jaws, while the ichthyoidea family includes a wide range of fish species that have adapted to aquatic environments.