Iniopterygiformes

Iniopterygiformes (Originally spelled Iniopterygia and sometimes informally abbreviated as "iniops") is an extinct order of cartilaginous fish known only from the Carboniferous period of the United States. Iniopterygians are characterized by large, superficially wing-like pectoral fins positioned upwards behind the head, from which the name of the group (translated as "nape fin") is derived. Iniopterygians are also noted to possess proportionally large skulls and eyes, armor plates composed of dentin, and "tooth-whorls" of fused teeth. Their elongated pectoral fins bore large, denticle-covered

Iniopteryx ("Nape Wing") is an extinct genus of cartilaginous fish known from the Pennsylvanian sub-period of the Carboniferous period. Fossils of Iniopteryx are known from the U.S. states of Nebraska and Indiana.