Nais pseudobtusa: A lateral photo of anterior end showing arrangement of chaetae, eyes, and overhanging prostomium (scale 500 µm) B dorsal photo of anterior end (scale 250 µm) C drawing of typical posterior-ventral chaeta D drawing of typical anterior-ventral chaeta D drawing of typical bundle of dorsal chaetae.

 
 
  Part of: Worsham MLD, Gibson R, Huffman DG (2016) The aquatic annelid fauna of the San Marcos River headsprings, Hays County, Texas. ZooKeys 618: 1-14. https://doi.org/10.3897/zookeys.618.8560