contained in material entity anterior region of the whole animal dorsal region of the whole animal posterior compartment of the whole animal testis PMID:23629965 PMID:29095551 testis lobule PMID:27330085 PMID:23652002 PMID:19247960 testis lobe PMID:19022767 ISBN:9780070316607 PMID:22318224 PMID:22371573 PMID:28812561 PMID:28434803 Planarian_Anatomy https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4928 male gonad PMID:25404302 PMID:20967238 PMID:20844018 PMID:27163480 PMID:16344473 A gonad containing male germline stem cells which fuel sperm production. Testes are located dorsolaterally, and are excluded from the head. The neoblast compartment, including piwi-1+, nanos+ primordial germ cells, fuels formation of testes during juvenile development and regeneration. https://doi.org/10.1101/279364 PMID:27304889 PMID:17376870 PMID:28072387 PMID:22074376 PMID:27149082 PMID:25278423 PMID:18456843 gonad prepharyngeal region parapharyngeal region tail copulatory region