part_of part of part of existence overlaps existence starts during or after independent continuant gonopore PMID:19247960 PMID:22899852 PMID:28434803 PMID:21566185 https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4407 common gonopore Planarian_Anatomy ISBN:9780070316607 PMID:20967238 PMID:16344473 The gonopore, a component of the copulatory apparatus, is an opening located on the ventral side of the animal posterior to the pharynx. The gonopore is the sole point of exit and entry for the reproductive system, allowing from reciprocal exchange of sperm during copulation and egg capsule laying. https://doi.org/10.1101/279364 genital pore PMID:27149082 PMID:25278423 PMID:22074376 PMID:28072387 juvenile stage copulatory apparatus pore adult hermaphrodite