Was considered a synonym of T. lilliei by Willems et al. (2004), but is considered a separate species by Artois et al. (2013).
Willems, W.; Artois,T.; Vermin, W.; Schockaert, E. (2004). Revision of Trigonostomum Schmidt, 1852 (Platyhelminthes, Typhloplanoida, Trigonostomidae) with the description of seven new species. Zoological Journal of the Linnean Society. 141(2): 271-296.