Two echinoid species from the early Aptian (Early Cretaceous) of the Kopet-Dagh Basin, NE Iran Author Schlüter, Nils Author Taherpour-Khalil-Abad, Morteza Author Majidifard, Mahmoudreza Author Hassanzadeh, Zinat Author Taheri, Jafar text Zootaxa 2019 2019-08-13 4656 1 121 132 journal article 26032 10.11646/zootaxa.4656.1.5 cfb36b3b-46e0-4cfe-83fd-4b1f09d29fb7 1175-5326 3366776 884B53B1-3EC1-4258-A4E6-1928F167632C Genus Tetragramma L. Agassiz, 1838 Type species. Tetragramma variolare (Brongniart, in Cuvier & Brongniart, 1822 ) by subsequent designation of Lambert & Thiéry (1910) .