Term: ventral fin fold posterior-most region
Name: ventral fin fold
Synonyms: anal fin fold, tail fin fold, ventral fin
Definition: Region of the median fin fold that develops into the anal and caudal fin.
Ontology: Anatomy Ontology [ZFA:0001069]

Name: posterior-most region
Synonyms: posterior-most, posteriormost
Definition:
Ontology: Spatial Ontology [BSPO:0000037]