Molyneux, 1987
From dinoflaj3
Molyneux, S.G., 1987: II. Appendix. Acritarchs and chitinozoa from the Arenig Series of south-west Wales. The Arenig Series in south Wales: stratigraphy and palaeontology; Bulletin of the British Museum (Natural History), Geology, v.41, no.3, p.309-364.