Di Martino, Emanuela, et al. “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, no. 207, June 2016, doi:10.5852/ejt.2016.207.