Subdivision of an organism along anterior-posterior axis that is the posteriormost region, extending past the anus (or cloaca, if present), consisting of a tail in some fully formed chordates (or a tail bud in embryos). In animals that have a sacral region, this is the region immediately posterior to this.
Synonyms:
related_synonym:
post-anal caudal region; post-anal tail region; postsacral region; tail region