urostyle

[ yoo r-uh-stahyl ]

/ ˈyʊər əˌstaɪl /

the fused vertebrae at the posterior end of the spinal column of some fishes and tailless amphibians.

Origin of urostyle

First recorded in 1870–75; uro-² + -style²

The urostyle is post-sacral and corresponds to three or more modified vertebrae.

The Vertebrate Skeleton |Sidney H. Reynolds
The urostyle is the name given to a modified bony structure, originally the end of the notochord, turned upward in most fishes.

A Guide to the Study of Fishes, Volume 1 (of 2) |David Starr Jordan
The post-sacral part of the spinal column ossifies continuously, forming an unsegmented cylindrical rod, the urostyle.

The Vertebrate Skeleton |Sidney H. Reynolds
The ultimate changes of the notochord and urostyle vary very considerably in the different types of Teleostei.

The Works of Francis Maitland Balfour, Volume III (of 4) |Francis Maitland Balfour

The urostyle is a long cylindrical rod which articulates with the sacrum generally by two facets.

The Vertebrate Skeleton |Sidney H. Reynolds

urostyle

/ (ˈjʊərəʊˌstaɪl) /

the bony rod forming the last segment of the vertebral column of frogs, toads, and related amphibians

C19: from uro- ² + Greek stulos pillar