Prionocidaris pistillaris from Salt Rock, Dolphin Coast, 4391, South Africa. Source : observation on iNatualist (https://www.inaturalist.org/observations/12373256).
Prionocidaris baculosa observed in Philippines. Picture (https://commons.wikimedia.org/wiki/File:Prionocidaris_baculosa.jpg?uselang=fr) by Andrey Ryanskiy.