This is a very nice preserved ammonite of the species Art Kosmoceras (Spinikosmoceras) aculeatum from the middle Jurrasic of Ryazan, Russian. | |||
Location: | Michailov, Ryazan Region, Russian | ||
Size: | about 43 mm | ||
Age: | Upper Jurasic Jura, Callovian, (ca. 160 Ma) |