Macrostomum shekouense Wang & Shi, sp. nov.: A whole body, ventral view B sagittal section of the tail C male copulatory apparatus D penis stylet E mature sperm. Abbreviations: ag: adhesive glands; br: brain; c: cilia; cl: curved length from proximal to distal ends; cg: cement glands; dd: direct distance between proximal and distal ends; e: eye; fa: female antrum; fg: female gonopore; fvs: false vesicula seminalis; i: intestine; mg: male gonopore; o: ovary; oo: oocyte; p: pharynx; pg: pharyngeal glands; ps: penis stylet; rc: rigid cilia; rh: rhabdites; sh: sensory hair; t: testis; vl: vertical line from line “dd” to curve vertex of line “cl”; vg: vesicula granulorum; vs: vesicula seminalis. Scale bars: 100 μm (A); 20 μm (B, C); 10 μm (D); 5 μm (E).