cavity. The gland secretion is conveyed to the surface via ducts that, in most species, open at the top of a papilla (nipple-like structure).

Etymology

From : Medieval Latin, from Ancient Greek ?????????? (ouropugion), from ???? (oura) 'tail' and ???? (puge) 'rump'.

Distribution amongst species

The gland is invariably present during embryonic development, whereas it