The Echinoid Directory

Mistechinus de Loriol, 1897, p. 8

Diagnostic Features	Test rounded, tall domal in profile. Apical disc small; plating not preserved, presumed hemicyclic or dicyclic. Ambulacra trigeminate with echinoid-style plate compounding. Primary tubercle to every compound plate, with perradial granulation. Pore-pairs uniserial except adorally where they are arcuate. Interambulacral plates wider than tall; flexed adapically. Each plate bearing three or so subequal tubercles. Tubercles imperforate and crenulate. Peristome small, sunken, about 30% test diameter. Buccal notches not deep. Spines and lantern unknown.
Distribution	Eocene, Egypt
Name gender	masculine
Type	Mistechinus mayeri de Loriol, 1897, p. 9, by original designation.
Species Included	M. mayeri de Loriol, 1879; Eocene, Egypt. M. sickembergeri Gauthier, 1900; Lutetian, Middle Eocene, Egypt.
Classification and/or Status	Euechinoidea, ?Camarodonta, unnamed family (triplacidiids).
Remarks	Distinguished by its lack of an interradial granular zone. Loriol, P. de 1897. Notes pour servir à l’étude des échinodermes, 5. Mémoires de la Société de Physique et d’Histoire natuerlle de Genève, 32 (9), 1-26, pls 1-3. Lambert, J. & Thiery, P. 1909-1925. Essai de nomenclature raisonnee des echinides. Chaumont, Paris.