Fig. 2

Musculature of adult males of Trilobodrilus axi (a-d) and Dinophilus vorticoides (e-g). Maximum intensity projections of CLSM-image stacks of phalloidin-treated specimens. a) Main ventral musculature in T. axi (ventral view, middle part of z-stack only), b) copulatory organ and seminal vesicles (dorsal view, ventral part of z-stack), c) close up of copulatory organ (ventral view), d) horizontal section through middle part of copulatory organ showing muscles of penis sheath, penis cone and openings of gland ducts. e) Musculature of D. vorticoides (ventral view, ventral half of z-stack), f) copulatory organ and right seminal vesicle (lateral view, right half of z-stack), g) sagittal section through copulatory organ and right seminal vesicle (3D crop of z-stack). Abbreviations: am – anchoring muscle, cm – circular muscle, co – copulatory organ (penis), dllm – dorsolateral longitudinal muscle, dm – diagonal muscle, gdo – gland duct openings, gp – gonopore, mo – mouth opening, pcm – penis cone muscle, phb – pharyngeal bulb, pm – prostomial muscle, ps – penis sheath, spd – spermioduct, sph1, 2, 3 – sphincter muscles 1, 2, 3, sv – seminal vesicle, vllm – ventrolateral longitudinal muscle, vlm – ventral longitudinal muscle