Ionoscopiformes

Ionoscopiformes
Temporal range:
A specimen of Ionoscopus the type genus of the order
A skeletal diagram of Robustichthys, an early member of the order
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Clade: Halecomorphi
Order: †Ionoscopiformes
Grande & Bemis, 1998
Type genus
†Ionoscopus
Costa, 1853
Genera
  • †Asialepidous
  • †Asialepidous
  • †Cerinichthys
  • †Elongofuro
  • †Heterolepidotus
  • †Holzmadenfuro
  • †Ohmdenfuro
  • †Ophiopsis
  • †Panxianichthys
  • †Schernfeldfuro
  • †Subortichthys
  • †Robustichthys
  • †Zandtfuro
  • †Furidae
  • †lonoscopidae
  • †Italophiopsidae
  • †Ophiosiellidae
  • †Subortichthyidae

Ionoscopiformes is an extinct order of largely marine, ray-finned fish generally considered to be the sister group to Amiiformes, an order that contains the modern Bowfin. The earliest members of the order are found in Middle Triassic deposits in all continents besides Australia and Antarctica, showing that the group was very widespread even during this time. They would continue to diversify throughout the Jurassic and Cretaceous with the youngest records of the group being during the Albian. The order has had a complicated taxonomic history since the 2010s with authors suggesting that the group my not be monophyletic, instead separating members into Ionoscopiformes and Ophiopsiformes. However, more recent studies do find the group to be a true clade. Currently, the order contains four generally accepted families (Ionoscopidae, Italophiopsis, Ophiopsiellidae, and Subortichthyidae). A fifth family, Furidae, mentioned in the literature though some more recent papers consider it a synonym of what was once Ophiopsidae and it's generally not used in phylogenies focused on the group.

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