Pseudostomum gracilis 2017 Fig 4 a) Organization from life observation. b) Total view. c) Hind end with copulatory organ. d), e) Copulatory organ with muscular penis, granular vesicles, and seminal vesicle
from Armonies W (2017) Long-term change of meiofaunal species composition in a sandy beach, with description of 7 new species of Platyhelminthes. Helgoland Marine Research. 71(12). DOI 10.1186/s10152-017-0492-0