Abstract
Herein, two recently described nominal genera of Sinoalidae, Juroala Chen & Wang, 2019a, with a single species, and Parasinoala Fu & Huang, 2019a with three species from the Middle to Upper Jurassic Daohugou Bed, are revised. Parasinoala is considered a junior synonym of Juroala syn. nov., and Parasinoala minuta is transferred to Juroala comb. nov.; and because of also transferring P. daohugouensis to Juroala, it is preoccupied and is given the new replacement name Juroala daidaleos nom. nov.. A new fossil horizon yielding very rich sinoalid assemblage was recently discovered at the topmost Daohugou Bed with many specimens of Juroala collected. On the basis of these well-preserved new materials, the morphological details of three described species of Juroala are revised and intraspecific variation is discussed. The new fossil horizon has a geological age distinctly younger than other described sinoalid assemblages. All the three species of Juroala present extremely limited morphological changes but slightly larger sizes than the previously described specimens. The new fossil horizon is rich in sinoalids, unlike other layers from the Daohugou Bed that are dominated by the procercopids, suggesting a possible different high altitude adaptability of Jurassic cercopoids.
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