Guildayichthyidae
Extinct order of ray-finned fishes
From Wikipedia, the free encyclopedia
Guildayichthyidae is a extinct family of marine fish from the Mississippian Bear Gulch Limestone of Montana.[1][2] It is the only family in the order Guildayichthyiformes. Guildayichthyids possess an uncommon mixture of primitive and modern characteristics in their skull bones.[3]
.jpg)
Phylum:Chordata
Class:Actinopterygii
Order:†Guildayichthyiformes
Lund, 2000
Lund, 2000
Family:†Guildayichthyidae
Lund, 2000
Lund, 2000
| Guildayichthyidae Temporal range: | |
|---|---|
| |
| Fossil of Discoserra pectinodon | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | †Guildayichthyiformes Lund, 2000 |
| Family: | †Guildayichthyidae Lund, 2000 |
| Genera | |
|
See text | |
Their taxonomy has long been debated, with studies placing them within the Neopterygii, while others placed them within the Cladistia. A 2025 study found them to most likely be the sister group to the extinct Bobasatraniiformes, with the two forming an early-diverging clade within the crown group Actinopterygii.[4]
Taxonomy
This family consists of the following genera and species:[1]
- Genus Guildayichthys Lund, 2000
- Species Guildayichthys carnegiei Lund, 2000
- Genus Discoserra Lund, 2000
- Species Discoserra pectinodon Lund, 2000
