Schmelzle, Sebastian, Lukas Helfen, Roy A. Norton, and Michael Heethoff. “The Ptychoid Defensive Mechanism in Phthiracarus Longulus (Acari, Oribatida, Phthiracaroidea): Exoskeletal and Muscular Elements”. Soil Organisms 82, no. 2 (August 1, 2010): 253. Accessed February 9, 2026. https://www.soil-organisms.org/SO/article/view/231.