One of the mysteries of the English language finally explained.
A long bone formed from fused vertebrae at the base of the vertebral column in some lower vertebrates, especially frogs and toads.
- ‘Anurans also have nine or fewer presacral vertebrae (usually eight), and the three or four posterior to the sacrum are fused into a rod called the urostyle.’
- ‘The caudal vertebrae have been fused into a single rod-shaped skeletal element (the urostyle or coccyx) that lies between the ilia, in effect moving the tail internally.’
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