Sinemurian genus extinctions

Bienotherium is an extinct genus of cynodonts from the Early Jurassic of China discovered by Bian Meinian (Mei Nien Bien). Despite its size, it is closely related to Lufengia, and is the largest tritylodont from the Lufeng Formation in China.

Chondrosteus ("cartilage bone" in Greek) is a genus of extinct marine actinopterygian (ray-finned fish) belonging to the family Chondrosteidae. It lived during the Hettangian and Sinemurian (early Early Jurassic) in what is now England. Chondrosteus is related to sturgeons and paddlefishes as part of the clade Acipenseriformes, and is one of the earliest known definitive members of the group. Similar to sturgeons, the jaws of Chondrosteus were free from the rest of the skull (projectile jaw system). Its scale cover was reduced to the upper lobe of the caudal fin like in paddlefish. It is repre