original description
Graff, L., von. (1882). Monographie der Turbellarien 1. Rhabdocoelida. <em>[Book].</em> 1-442, Verlag Wilhelm Engelmann, Leipzig., available online at https://books.google.com/books/about/Monographie_der_Turbellarien.html?id=LT0hAQAAMAAJ
page(s): 279–280; note: Described as a variety, but see Art. 45.6.4 of ICZN for rank of varieties published before 1961. [details]
taxonomy source
Graff, L. von. (1905). Marine Turbellarien Orottavas und der Küsten Europas. <em>Zeitschrift fur wissenschaftlige Zoologie.</em> 83: 68-150. With 6 plates., available online at https://www.biodiversitylibrary.org/page/43242488
page(s): 85 [details]
additional source
Steinbock, O. (1938). Marine Turbellaria. <em>The Zoology of Iceland, Levin & Munksgaard (Publ.), Copenhagen and Reykjavik,.</em> Vol. II, Part 9, 26 pp., 8 f.
page(s): 9 [details] Available for editors
From editor or global species database
Authority Graff (1882) introduces the taxon as a variety. In 1905, he explicitely states that it is should be treated a subspecies. However, since in his 1882 contribution there is no explicit statement that the taxon should be treated infrasubspecific, the authority and date for the subspecies is Fraff (1882), following Art. 45.6.4 of the ICZN [details]