| Crossognathiformes Temporal range: | |
|---|---|
| | |
| Rhacolepis fossil | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Division: | Teleostei |
| Order: | † Crossognathiformes Taverne, 1989 |
| Type genus | |
| † Crossognathus Pictet, 1858 | |
| Subgroups | |
See text | |
Crossognathiformes is an extinct order of ray-finned fish that lived from the Late Jurassic to the Eocene. Its phylogenetic placement is disputed; some authors have recovered it as part of the teleost stem group, [1] while others place it in a basal position within crown group Teleostei. [2] Other placements have found it to be polyphyletic, with Varasichthyidae being stem-group teleosts whereas the other, "true" crossognathiforms are crown-group teleosts within Teleocephala. [2]
The oldest definitive crossognathiforms are known from the Late Jurassic (Oxfordian) of Chile. They diversified afterwards and became a dominant group of marine fish throughout much of the Cretaceous. The last surviving member was the pachyrhizodontid Platinx from the Eocene. [3]
Order CrossognathiformesTaverne, 1989 [1] [4]

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