| Guildayichthyidae Temporal range:
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| Fossil of Discoserra pectinodon | |
Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | †Guildayichthyiformes Lund, 2000 |
| Family: | †Guildayichthyidae Lund, 2000 |
| Genera | |
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See text | |
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]
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
[edit]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
References
[edit]- ^ a b Lund, Richard (2000). "The new Actinopterygian order Guildayichthyiformes from the Lower Carboniferous of Montana (USA)" (PDF). Geodiversitas. 22 (2): 171–206.
- ^ Albert, James S.; Johnson, Derek M. (23 November 2011). "Diversity and Evolution of Body Size in Fishes". Evolutionary Biology. 39 (3): 324–340. doi:10.1007/s11692-011-9149-0. S2CID 255346377.
- ^ "Exquisitely-Preserved Guildayichthys Mississippian Bear Gulch Fish". FossilMall.
- ^ Stack, Jack. "An ontological morphological phylogenetic framework for living and extinct ray-finned fishes (Actinopterygii)". The Anatomical Record. n/a (n/a). doi:10.1002/ar.70090. ISSN 1932-8494.
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