Doweld AB. Protaeropsis, a new replacement generic name for fossil Sphenaster Jeffery, 1999 (Echinoidea: Spatangida) nec Wilcoxon, 1970 (Protista: Haptomonada). Zootaxa [Internet]. 2016 Jul. 21 [cited 2025 May 22];4139(3):421–423. Available from: https://mapress.com/zt/article/view/zootaxa.4139.3.6