1. A Middle Devonian chasmataspid arthropod from Achanarras Quarry, Caithness, Scotland
2. Crampton C.B. Carruthers R.G. 1914. The Geology of Caithness (Sheets 110, 116 with parts of 109, 115 and 117). Memoirs of the Geological Survey of Great Britain, 8, HMSO, Edinburgh.
3. Denison R. 1978. Placodermi. Handbook of Paleoichthyology, 2. Gustav Fischer Verlag, Stuttgart.
4. On the coccosteid arthrodire Millerosteus minor
5. Die Fische des baltischen Devons;Gross;Palaeontographica,1933