Wikipedia
Zaraiskites
Zaraiskites is an extinct genus of ammonoid cephalopod that lived during the Volgan stage of the Middle Jurassic in what is now the Russian Platform.
Zaraiskites has a ribbed evolute shell without tubercles. Inner whorls are with normal bifurcate or triplicate ribbing; outer whorl is with virgatotome ribbing with as many as seven secondary ribs taking off successively in front of each primary rib.
Related genera in the Virgatitinae include Acuticostites and Virgatites