What is "sinemys"

Sinemys is an extinct genus of turtle from the Late Jurassic to Early Cretaceous of China and Japan. Three species have been named: S. lens, the type species, from the Kimmeridgian- Tithonian of Shandong; S. gamera, from the Valanginian- Albian of Nei Mongol; and S. wuerhoensis, from the Aptian- Albian of Xinjiang.