Synonyms: Cephalaspis schrenkii.
Classification: Chordata, Osteostraci.
Species: T. schrenki (type?), T. schmidti. Also? T. mammillata, T. milleri, T. panderi, T. patteni, T. rohoni, T. scalaris, T. simonsoni.
Size: About 10 centimetres long.
Known locations: Estonia.
Time period: Wenlock to Ludlow of the Silurian.
Fossil representation: Several specimens, particularly of the head shield.
Tremataspis was a jawless fish known to have lived in the European ocean waters of Silurian period. The genus is noted for having a more rounded bony head shield than that seen in other genera, which may have helped Tremataspis to push through softer bottom sediment on the ocean floor.
- The exoskeleton of Tremataspis, Robert H. Denison - 1947.
- On the Appendages of Tremataspis, W. Patten - 1903.