Report on Oribatid Mites in Eco-Friendly Agriculture with a Description of Third New Species of the Genus Cosmogalumna from the Litter of Coconut Palm Tree on Ishigaki Island, in Southern Japan

摘要

Oribatids are subdived taxonomically into Macropylina, Apterogastrina and Pterogasterina. In the field of eco-friendly agriculture, the number of Pterogasterina species was clearly larger than in the field with tillage management or chemical fertilizer application. This indicates that an increase in the number of Pterogasterina species is a bio-indicator of eco-friendly agriculture. A new species of the Pterogasterina, Cosmogalumna hiroyoshii, was collected from coconut palm tree litter on Ishigaki Island, in southern Japan. Characteristic features of the new species include thick rostral setae which are not extending in front of the anterior rostral margin; a bimucronate rostrum; setae le inserted lateral to the carina L between L and L; the polygonal structure on the prodorsal, notogastral, pteromorphal surfaces, and ventral plate; and on the alveoli of dorsal setae, granules on and around each area porosa.