Reference

Wilfried Schönborn, T. Peschke (1988): Biometric studies on species, races, ecophenotypes and individual variations of soil- inhabiting Testacea (Protozoa, Rhizopoda) , including Trigonopyxis minuta n. sp. and Corythion asperulum n. sp. – Arch. Protistenkunde – 136: 345 - 363.