Authors(s)	Ball, I. R.
Year	1975a
Title	Contributions to a revision of the marine triclads of North America: the monotypic genera Nexilis, Nesion, and Foviella (Turbellaria: Tricladida). Can. J. Zool. 53: 395-407.

• Foviella affinis
• Nesion arcticum
• Nexilis epichitonius