Type species. Temertassetia temertassetensis.
Diagnosis. Small conch, maxium 50 mm in diameter. Subinvolute or subevolute, narrowing of the umbilicus at juvenile stages, some species with adult re-opening of the umbilicus. Steinkern with prominent concavo-convex or biconvex constrictions; faint or sharp riblets between the constrictions. Suture with V-shaped, very narrow or narrow external lobe (EL w/d = 0.40-0.70; EL/AL = 0.90-1.40) and very low or low median saddle (MS h = 0.18-0.25); ventrolateral saddle rounded, symmetric or slightly asymmetric; adventive love V-shaped, symmetric or asymmetric.