†order Palaechinoidea Haeckel 1866 (sea urchin)
Alternative spelling: Palechinida
Full reference: E. Haeckel. 1866. Generelle Morphologie der Organismen, Allgemeine Grundzuge der Organischen Formen-Wissenschaft, Mechanisch Begründet Durch die von Charles Darwin Reformirte Descendez-Theorie. Verlag von Georg Reimer, Berlin CLX-462
Parent taxon: Eognathostomata according to H. Hagdorn 2018
See also Kier 1966
Sister taxa: none
Subtaxa: Cravenechinidae Palaechinidae Wrightia Xysteria
Ecology: slow-moving low-level epifaunal grazer
Distribution:
• Permian of Greece (1 collection), United States (1: Texas)
• Carboniferous of the United Kingdom (1), United States (1: Indiana)
• Silurian of Sweden (1)
Total: 5 collections each including a single occurrence