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Crown salamanders first appeared in the Middle Jurassic (Bathonian) and remains of these oldest representatives of the group have been found in various vertebrate localities in China, Western Siberia, and Western Europe. Here, we report the discovery of an indeterminate crown salamander in the Middle Jurassic (Bathonian) Peski locality of Moskvoretskaya Formation of the Moscow Region, Russia. This find (a fragmentary trunk vertebra) represents (1) new occurrence of the oldest crown salamanders; and (2) the first fossil record of crown salamanders in the Middle Jurassic of Eastern Europe. The trunk vertebra from the Peski locality resembles those of the modern crown salamanders of the Salamandroidea clade in the presence of spinal nerve foramina and bicapitate transverse processes. If our assignment of the Peski salamander to Salamandroidea is correct, then it is the oldest salamandroid in the fossil record.

Discovery of a crown salamander in the Middle Jurassic (Bathonian) Moskvoretskaya formation of the Moscow Region, Russia