Pteraspidomorphi - Astraspidiformes

Full reference: V. Karatajute-Talimaa and M. Meredith Smith. 2004. Tesakoviaspis concentrica: microskeletal remains of a new order of vertebrate from the Upper Ordovician and Lower Silurian of Siberia. Recent Advances in the Origin and Early Radiation of Vertebrates 53-64

Belongs to Tesakoviaspis according to V. Karatajute-Talimaa and M. Meredith Smith 2004

Sister taxa: none

Type specimen: Its type locality is Tchunia (Tchunku) River, Nizhniaya, which is in a Llandovery marine horizon in the Russian Federation

Ecology: