Suborder Myxiniformes is a scientific term used to classify a group of marine jawless fish, commonly known as hagfish. Synonyms for this term include Myxinidae, Agnatha and Hyperotreti. Myxinidae refers to the family of hagfish and is derived from the Greek word "myxa" meaning slime, which is a unique feature of these creatures. Agnatha is a broader term used to describe jawless fish and is also derived from Greek language, meaning "no jaws". Hyperotreti is a technical term for the suborder that refers to the position of the nostrils on top of the head. These synonyms are often used interchangeably in scientific literature and research.