Parasemionotiformes
Parasemionotiformes is an extinct order of neopterygian ray-finned fish that existed globally during the Triassic period. It comprises the families Parasemionotidae and Promecosominidae. Many of the included genera are monotypic and most species lived during the Early Triassic epoch. Parasemionotiforms were normally small to medium-sized fishes. They were predominantly marine. Parasemionotiformes are one of the earliest clades of the Halecomorphi, the group that comprises the living bowfin ("Amia calva") and its extinct relatives. Parasemionotiforms are the sister group to all other halecomorphs.