Tolypelepidida
Appearance
Tolypelepidida | |
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The type species, Tolypelepis undulata | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Infraphylum: | Agnatha |
Class: | †Pteraspidomorphi |
Subclass: | †Heterostraci |
Order: | †Tolypelepidida Denison 1964 |
Family: | †Tolypelepididae Kiær 1932 |
Genera | |
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.
![](http://up.wiki.x.io/wikipedia/commons/thumb/5/5e/Athenaegis_chattertoni_cast.jpg/220px-Athenaegis_chattertoni_cast.jpg)
![](http://up.wiki.x.io/wikipedia/commons/thumb/8/87/Athenaegis_chattertoni_-_MUSE.jpg/220px-Athenaegis_chattertoni_-_MUSE.jpg)
References
[edit]- ^ 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.