Ophidiiformes is an order of Actinopterygii that includes the (family Ophidiidae), (family Carapidae), viviparous brotulas (family Bythitidae), and others. Members of this order have small heads and long slender bodies. They have either smooth scales or no scales, a long dorsal fin and an anal fin that typically runs into the caudal fin. They mostly come from the tropics and subtropics, and live in both freshwater and marine habitats, including abyssal depths. They have adopted a range of feeding methods and lifestyles, including parasitism. The majority are Oviparity, but some are Viviparity.
The earliest fossil members are known from the Maastrichtian, and include the basal ophidiiform Pastorius from Italy and several species of the basal cusk-eel Ampheristus from the United States and Germany.
The families Ranicipitidae () and Euclichthyidae () were formerly classified in this order, but are now preferred in Gadiformes; Ranicipitidae has been absorbed within the family Gadidae.
Until recent taxonomic revisions, the suborder Ophidioidei was a Paraphyly grouping. However, the Bythitoidei are vivipary and seem to make up a Monophyly group,
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