An inward fold on the surface of the embryonic ectoderm that develops into part of the anal passage.

Local Unique Identifier

0000139

Synonym

• anal pit (RELATED)
• anus (RELATED)
• proctodaeum (RELATED)

Relation BFO:0000050 part of

• hog:0000395
• hog:0001766

Xref Teleost Anatomy Ontology

tao:0000066