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Related to Pygostyle: Synsacrum


(vertebrate zoology)
A specialized bone in birds which is formed by a number of fused tail vertebrae.



in most birds (except ratites and tinamous), a bone formed from four to six concresced posterior caudal vertebrae. The pygostyle, which is a flattened vertical plate, serves to anchor the rectrices forming the tail of the bird.

References in periodicals archive ?
Falling and heavy landings in pet birds are commonly associated with inappropriate trimming of the flight feathers, often leading to a variety of injuries including sternal, pygostyle, beak, and leg injuries.
The pygostyle was absent and the synsacrum had been gnawed, although not destroyed.
The bird had flight-specialized shoulders and a distinctly avian adaption called the pygostyle -- a shortened set of tail vertebrae fused into one bone.