- Fryer, G.; Stanley, G.D. (2004). "A
Silurian porpitoid hydrozoan from ****bria, England, and a note on
porpitoid relationships". Palaeontology. 47 (5): 1109–1119...
- (mistaken for a coral), and
Paropsonema (mistaken for a jellyfish-like
porpitoid hydrozoan). Eldoniids, in a
broad definition, also
include Rotadiscus...