Baminornis

Baminornis (meaning "Fujian Province bird") is an extinct genus of basal avialans from the Late Jurassic (Tithonian age) Nanyuan Formation of China. The genus contains a single species, Baminornis zhenghensis, known from a partial skeleton. Baminornis was initially identified as the oldest known avialan to bear a fused pygostyle, but later research cast doubt on the identification of this structure, claiming it could instead be part of the synsacrum.