Barykovia, a new genus of angiosperms from the Campanian of northeastern Russia

Fossil leaves from the Campanian of Ugol'naya Bay (northeastern Russia) previously assigned to Quercus tchucotica Abramova are described as Barykovia tchucotica (Abramova) Moiseeva comb. nov., the type species for the newly recognized extinct foliage genus Barykovia Moiseeva gen. nov. Quercus tchucotica was identified in a number of floristic assemblages in northeastern Russia. Leaves of the genus Barykovia are highly variable in shape and leaf margin, which makes it difficult to differentiate species. However, based on an analysis of the morphological variability of the leaves, a second new species, B. kamchatica Moiseeva from the Upper Bystrinskaya Subformation of northwestern Kamchatka is established. The finding of a B. kamchatica shoot with leaves attached confirms that this genus has simple leaves.

► The new extinct genus Barykovia from Campanian of northeastern Russia is described. ► Species B. tchucotica and B. kamchatica previously assigned to Quercus are erected. ► New find of shoot with leaves attached confirms that this genus has simple leaves.