Morphological ontogeny of Perlohmannia nasuta (Acari, Oribatida, Perlohmanniidae), with comments on Perlohmannia Berlese

摘要

The morphological ontogeny of Perlohmannia nasuta Schuster, 1958 is described and illustrated. The adult of this species is the most similar to that of P. dissimilis (Hewitt, 1908), but differs from it by having alveolar seta exp (versus setiform in P. dissimilis), which is unique in Perlohmannia Berlese, 1916. It also has more spines on the bothridial seta and shorter seta c_1 than has P. dissimilis. The juveniles of P. nasuta have the prodorsal seta exp alveolar, 7-8 anterior spines on the bothridial seta, and seta e_2 longer than f_2. Claparède's organ of larva is long and cudgel-shaped. This species differs clearly from P. dissimilis in the ontogeny of leg setae. In both species, hypertrichy occurs on tarsi, especially on tarsus I, but P. nasuta has more setae on tarsus I of deutonymph, tritonymph and adult than has P. dissimilis.