| Tolypelepidida | |
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| The type species, Tolypelepis undulata | |
Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Infraphylum: | Agnatha |
| Class: | †Pteraspidomorpha |
| Subclass: | †Heterostraci |
| Order: | †Tolypelepidida Denison 1964 |
| Family: | †Tolypelepididae Kiær 1932 |
| Genera | |
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| Synonyms | |
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Tolypelepidida is an extinct order of heterostracan vertebrates. These armored jawless fish superficially resemble their relatives, the cyathaspids, though, researchers place the tolypelepids as a sister group to the cyathaspids and the pteraspidids (and both groups' daughter taxa).1 A recent study by Lundgren and Blom in 2013 implies that the order is paraphyletic, with the type genus, Tolypelepis, being the sister taxon of Cyathaspidiformes.2 The typical tolypelepid had a carapace formed from dorsal and ventral plates, and a scaly tail.
References
References
- Janvier, Philippe (1997) Heterostraci The Tree of Life Web Project.
- Lundgren, Mette, and Henning Blom. "Phylogenetic relationships of the cyathaspidids (Heterostraci)." GFF 135.1 (2013): 74-84.