Posterior end of male Acutogordius taiwanensis sp. n. A–C Images of the posterior end with the postcloacal crescent extending A, C over or B anterior to the starting point of the tail lobe bifurcation D–FSEM images of the posterior end with a D angled E slightly curved, and F semicircular postcloacal crescent A–F are images from the same individual, respectively. Scale bars 500 µm (A–C), and 200 μm (D–F).