On the Genus Megeremaeus Higgins et Woolley, 1965 (Acari, Oribatida, Megeremaeidae), with a Description of a New Species Megeremaeus sikhotealinus Ryabinin et Wu sp. n.

Abstract

A brief review of the Megeremaeus species of the world fauna is given, and the synonymy of Ctenobelba (Aokibelba) rameus (Wen et Zhao, 1993) comb. n. = C. (A.) polysetosa (Aoki et Yamamoto, 2000) syn. n. is established. A description of the new species Megeremaeus sikhotealinus sp. n., found in the Sikhote-Alin Mountains, is provided. The trichobothria in the new species are slightly expanded in the distal third, placed on a long stalk, and covered with small setulae. The interlamellar setae are barbed, apically blunt, and half as long as the trichobothria. The translamellar ridge is well developed in the lower basal part, and there is a thin ridge connecting the cusps of lamellae together and to the ends of the tutoria. The notogastral setae are covered with sparse hairs; many of these setae extend to or beyond the bases of the posterior setae. There are 2 pairs of anal setae. The discidium is pointed. Companion setae d on genua I–III are blunt, slightly expanded in the middle part, and covered with small setulae.