Thelodonti genera

Thelodus (from , 'nipple' and , 'tooth') is an extinct genus of thelodont agnathan that lived during the Silurian period. Fossils have been found in Europe, Asia and North America.

Lanarkia is a genus of extinct thelodont agnathan which existed in what is now Scotland and Canada during the upper Silurian period.

Phlebolepis is an extinct thelodont agnathan genus belonging to the family Phlebolepididae. Whole fossils are found in Late Silurian (Ludlow epoch) aged strata from Saaremaa, Estonia. Phlebolepis elegans was average-sized for a thelodont, 7 cm long.

Loganellia is a genus of jawless fish which lived between 430 and 370 million years ago, during the Silurian and Devonian periods of the Paleozoic. Loganellia belonged to the Thelodonti class and like other thelodonts possessed scales instead of plate armor.

Cometicercus is an extinct genus of furcacaudiform thelodont which lived in the Northwest Territories of Canada during the Early Devonian period. It hails from the MOTH locality in the Mackenzie Mountains. It is only known from its caudal fin and parts of its dorsal surface, including its dorsal fin.'' The scales of Cometicercus'' likely served an anti-parasite role, similar to modern sharks which form large groups and cruise at slow to medium speeds.

Furcacauda is a genus of thelodontid agnathan from the Lower Devonian of Canada, and is the type genus of the order Furcacaudiformes. It contains two species, both of which hail from the MOTH locality in the Mackenzie Mountains of the Northwest Territories.