Hansen, J.G., D'Addabbo Gallo, M. & Grimaldi De Zio, S. (2003). A comparison of morphological characters within the genus
Rhomboarctus (Tardigrada: Heterotardigrada) with the description of two new species. Zoologischer Anzeiger - A Journal of Comparative Zoology. 242(1): 83-96.