Reference
Emanuela Di Martino, Paul D. Taylor, Dennis P. Gordon, Lee Hsiang Liow (2016): On Powellithecidae fam. nov., a new Pliocene to Recent bryozoan
family endemic to New Zealand, with the description of Powellitheca gen. nov. (Bryozoa, Cheilostomata) – European Journal of Taxonomy – 0207: 1 - 17.