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Doweld, A.B. 2016. Protaeropsis, a new replacement generic name for fossil Sphenaster Jeffery, 1999 (Echinoidea: Spatangida) nec Wilcoxon, 1970 (Protista: Haptomonada). Zootaxa. 4139, 3 (Jul. 2016), 421–423. DOI:https://doi.org/10.11646/zootaxa.4139.3.6.