Abstract
Trhypochthonius nigricans and T. cladonicolus are redescribed on the basis of type specimens originating from C. Willmann’s collection and comparative material from Poland, Canada and the USA. The taxonomic importance of some morphological characters is analysed. Shape of the sensillus does not seem to be a good diagnostic character in the genus Trhypochthonius. Trhypochthonius sphagnicolus is recognized as a junior synonym of T. nigricans and T. cladonicolus is noted for the first time from the North America.
References
Berlese A. (1882–1896) Acari, Myriapoda et Scorpiones hucusque in Italia reperta, Ordo Cryptostigmata (Oribatidae) (Cryptostigmata II). Portici, 98 pp.
Berlese A. (1904) Acari nuovi. Manipulus II. Redia, 1, 258–280.
Palmer S.C. & Norton R.A. (1991) Taxonomic, geographic and seasonal distribution of thelytokous parthenogenesis in the Desmonomata (Acari: Oribatida). Experimental and Applied Acarology, 12, 67–81.
Seniczak S. & Norton R.A. (1994) The morphology of juvenile stages of moss mites of the family Trhypochthoniidae (Acari: Oribatida). II. Zoologischer Anzeiger, 233, 29–44.
Weigmann G. (1997) New and old species of Malaconothroidea from Europe (Acari, Oribatida). Spixiana, 20, 199–218.
Willmann C. (1919) Diagnosen einiger neuer Oribatiden aus der Umgebung Bremens. Abhandlungen vom Naturwissenschaftlichen Verein zu Bremen, 24, 552–554.
Willmann C. (1923) Oribatiden aus Quellmosen (mit besonderer Berücksichtigung der Quellen Ostholsteins und der Umgegend von Bremen). Archiv für Hydrobiologie, 14, 470–477.
Willmann C. (1928) Neue Oribatiden I. Zoologischer Anzeiger, 76, 1–5.
Willmann C. (1931) Moosmilben oder Oribatiden (Cryptostigmata). In: Dahl F. (Ed.), Die Tierwelt Deutschlands 22. Fisher, Jena, 200 pp.