Tolypelepidida

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.

Tolypelepidida
Temporal range: Silurian - Early Devonian
The type species, Tolypelepis undulata
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Superclass: Agnatha
Class: †Pteraspidomorphi
Subclass: †Heterostraci
Order: †Tolypelepidida
Denison 1964
Family: †Tolypelepididae
Kiær 1932
Genera
  • Asketaspis
  • Athenaegis
  • Tolypelepis
Synonyms
  • Tolypelepidiformes

References
  1. Janvier, Philippe (1997) Heterostraci The Tree of Life Web Project.
  2. Lundgren, Mette, and Henning Blom. "Phylogenetic relationships of the cyathaspidids (Heterostraci)." GFF 135.1 (2013): 74-84.


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