FIGURE 22. Umbotectum capitofalcatum. Holotype RMNH.VER.21025.a in Molecular phylogenetics facilitates the first historical biogeographic analysis of the hammerhead worms (Platyhelminthes: Tricladida: Bipaliinae), with the description of twelve new species and two new genera

FIGURE 22. Umbotectum capitofalcatum. Holotype RMNH.VER.21025.a (field number RS325). A. Sagittal reconstruction of the copulatory apparatus; anterior to the right. Longitudinal musculature surrounding the musculo-glandular organ on the left not represented but present. B and C. Photomicrographs of sagittal section of the bulged roof of the common atrium; anterior to the right. *, packs of circular musculature; Ģ, cyanophil secretions.