Neoechinorhynchus (Hebesoma) spiramuscularis n. sp. from Xenocypris davidi. 1. Holotype male. Note the copulatory plug capping the bursa (arrow). 2. Anterior end of specimens in Figure 1 showing the spiral muscles wrapping around the proboscis receptacle, the undulating lemnisci, and the para-receptacle structure (arrow). 3. The proboscis of a paratype female. Note the two small giant nuclei near the apex. 4. A row of proboscis hooks. 5. Allotype female. Note a small part of the reticular secondary lacunar branches. 6. The reproductive system of a paratype female. Note the prominent dorso-ventral girdle with dorsal branching characteristic of this species. 7. Egg.