Thelodus

Thelodus Temporal range: Silurian PreЄ Є O S D C P T J K Pg N
Comparison of T. parvidens and Loganellia
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Thelodonti
Order:	Thelodontiformes
Family:	Coelolepidae
Genus:	Thelodus Agassiz, 1839
Type species
Thelodus parvidens
Synonyms
?Coelolepis Thelolepis Pachylepis

Thelodus is an extinct genus of thelodont agnathan that lived during the Silurian period. Fossils have been found worldwide. Unlike many thelodonts, species of Thelodus are known not only from scales, but from impressions in rocks. Some species, such as the Canadian T. inauditus, are thought to be comparable in size to other thelodonts, i.e., from 5 to 15 centimeters in length. The scales of the type species, T. parvidens (syn. T. macintoshi) of Silurian Great Britain, however, reach the size of coins, and, if proportioned like other thelodonts, such as Loganellia, the living animal would have been about one meter in length.