Tolypelepidida

Tolypelepidida; Temporal range: Silurian - Early Devonian
	The type species, Tolypelepis undulata
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Pteraspidomorphi
Subclass:	Heterostraci
Order:	Tolypelepidida
Family:	Tolypelepididae
Genera
	Tolypelepis; Athenaegis; Asketaspis;

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

^ 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.

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[1] Janvier, Philippe (1997) Heterostraci The Tree of Life Web Project.

[lundgren-2] Lundgren, Mette, and Henning Blom. "Phylogenetic relationships of the cyathaspidids (Heterostraci)." GFF 135.1 (2013): 74-84.

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