Anterior end of Acutogordius taiwanensis sp. n. A–C Images of the anterior end showing the (A) white cap and dark-brown collar and B–C white spots scattered on the brown collar D–FSEM images of the anterior end surface that is D smooth E smooth but wrinkled on the tip with holes scattered on the dark-brown collar, and F wrinkled A–F are images from the same individual, respectively. Scale bars 500 µm (A–C), and 200 μm (D–F).