Quick Answer. When a solid turns into a liquid it is called fusion, more commonly referred to as melting. When a material moves from one state of matter into another it is called a phase transition. Fusion is just one of approximately different states that matter can phase through.
Before the dinosaurs, there were Triops. Fossil Triops more than 200 million years old have been discovered. By comparison, dinosaurs date back only about 60 million years...just 'youngsters' in terms of geologic time. Triops are distant relatives of trilobites. Triops means three-eyes while the name trilobite means three lobed or three segments.
Triops, sometimes called tadpole, dinosaur or shield shrimp, are a small group of crustaceans that are in the Branchiopoda group that are found in temporary bodies of fresh or brackish water. Sometimes they are sold in 'Sea-Monkey' like kits in toy shops, they are often billed as living fossils.