Two new species of oppiid mites (Acari: Oribatida) from Turkey

Two new species of the family Oppiidae Sellnick, 1937, Ramusella (Insculptoppia) pinarbasiensis n. sp. and Dissorhina uludagensis n. sp., are described and illustrated based on adult specimens collected from Kayseri and Bursa provinces, Turkey respectively.


MATERIAL AND METHODS
The methods used for specimen collection, extraction, preparation, drawing and preservation were as discussed by Toluk and Ayyildiz (2008a). Measurements and descriptions are based on specimens mounted in temporary cavity slides and on permanent slides.

(Figures 1-3)
Diagnosis -Rostrum divided by a median incision. Lamellar line present, not reaching to the insertion of lamellar setae, trans-lamellar line faint. Sensilli 40 µm in length, fusiform, with long stalk and their distal half being dilated; 6-7 setae unilaterally, among them proximal setae longer than distal ones.

Dissorhina uludagensis n. sp.
( Figures 4-6) Diagnosis -Rostral apex triangular, conspicuously protruding from the rostral part of prodorsum. Incisure wide, lateral teeth much shorter than the median teeth and sharped. Two pairs of weak transversal costulae present. Sensilli fusiform, as long as 70% of the length of prodorsum (42 µm in length), its head some minute aciculae.
Prodorsum - (Figures 4a and 5) -Rostral apex triangular, conspicuously protruding from the rostral part of prodorsum. Incisures wide, lateral teeth much shorter than the median teeth and sharped. Rostral setae 10 µm in length, arising on this triangular apex. Two pairs of weak transversal costulae present. Lamellar and inter-lamellar setae smooth. Bothridia round, with small opening. Sensilli fusiform, as long as 70% of the length of prodorsum (42 µm in length), its head some minute aciculae.
Notogaster (Figures 4a and 5a) -Longer than wide, ratio 1.5:1. Anterior part well narrowed anteriorly, a short median part straight. Ten pairs of comparatively smooth notogastral setae present. The setae c2 and p series short, thin, 12 and 6 µm in length respectively, the remaining notogastral setae smooth, long 20 µm in length.
Etymology -Specific name "uludagensis" is named after the locality, Uludaǧ Mountain, Bursa, Turkey, where the new species was found.
Remarks -This new species stands very near to Dissorhina longispina Mahunka, 2006 by the shape and length of sensilli (Mahunka 2006). However, it is distinguished from it by the following features: 1) two pairs of short transversal costulae present, not starting from the bothridia in the new species (one pair of short costulae present, starting from the bothridia in D. longispina; 2) lamellar setae arising from anterior of transversal costulae (lamellar setae far beyond of costulae in D. longispina); 3) sensillus fusiform, its head some minute aciculae in the new species (sensillus lanceolate, its head smooth in D. muranyii) 4) body measurement in the new species : 204-228 / 104-120 µm (body measurement in D. muranyii: 290-301 / 140-147 µm).