Oribellopsis grecus, Mahunka & Mahunka-Papp, 2010

Mahunka, S & Mahunka-Papp, L, 2010, New And Little Known Oribatid Mites From The Carpathian Basin And The Balkan Peninsula (Acari: Oribatida), Acta Zoologica Academiae Scientiarum Hungaricae 56 (3), pp. 211-234 : 222-224

Oribellopsis grecus sp. n.

( Figs 16–22 )

Material examined. Holotype: E-2427: Greece, Ioannina county , Klidonia, gallery of a big sidestream of River S of the village, soil and moss, 406 m, N39°58.376’ E20°39.555’, 14.03.2008. Leg.: SZ. CZIGÁNY & D. MURÁNYI, 2008/29 and 2 paratypes from the same sample. Holotype (1781-HO-10) and 1 paratype (1781-PO-10) deposited in HNHM , 1 paratype in MHNG .

Diagnosis. Rostral part narrow, apex rounded, without teeth or incision. Rostral setae arising on tubercles, barbed. Prodorsum with short, narrowing median costulae, lateral costulae much longer than inner ones. Lamellar and exobothridial setae setiform, pointed at tip, interlamellar seta blunt at tip. Sensillus very long, its head narrow, slightly lanceolate. Anterior margin of notogaster straight, with small humeral tubercles. Ten pairs of setiform, curved setae, excepting posteromarginal setae all others nearly equal in length. Four pairs of transversal apodemes, apodemes 4 consisting of double lines. Genital and anal aperture very large, touching medially. Genito-anal setal formula: 6–1–2–3. Lyrifissures iad in longitudinal position, in front of anal aperture.

Measurements. Length of body: 417–451 µm, width of body: 252–285 µm.

Prodorsum. Anterior part of prodorsum triangulate, median apex absent. Rostral setae ( Fig. 22 ) distinctly ciliate, located near to anterior margin, arising on tubercles, short, as long as their mutual distance, curved inwards. Costulae short, much shorter than half length of prodorsum ( Fig. 16 ). Median costulae strongly narrowing anteriorly, well convergent, ending far from the insertion of lamellar setae. Lateral costulae on each side much longer and thicker than the median ones ( Fig. 19 ). A pair of indistinct maculae present in interlamellar region Lamellar and exobothridial setae nearly equal in length, both pairs sharply pointed at tip ( Fig. 18 ). Interlamellar setae slightly stronger and longer than preceding ones, distinctly blunt at tip. Bothridium angular, sensillus ( Fig. 20 ) conspicuously long, with barely dilated, small head with smooth surface.

Notogaster. Anterior margin straight, a pair of indistinct, hardly observable humeral apophyses present ( Fig. 16 ). Ten pairs of setiform, curved notogastral setae, all smooth. Setae p 1, p 2 and p 3 much shorter than others.

Lateral part of podosoma. Exobothridial field and a great part of sejugal region distinctly granulate ( Fig. 17 ). Pedotecta I and II very small. Tutorium without cusp ( Fig. 21 ).

Ventral parts. Coxisternal region well chitinised, consisting of 4 equally wide transversal and a very short anterior, longitudinal apodemes. Sejugal apodemes wider than the other, apodemes 4 consisting of double lines, apodemes 3 slightly narrower ( Fig. 18 ). Epimeral setal formula: 3–1–3–3, all distinctly barbed. Outer border of genital and anal aperture touching medially, both openings large. Genitoanal chaetotaxy: 6–1–2–3. Anal and adanal setae equal in length, setae ad 1 arising in adanal position on the same level with lyrifissures iad.

Legs. All legs monodactylous.

Remarks. The new species is closely related to Oribellopsis etruscus ( BERNINI, 1980) according to SUBÍAS (2004, 2009) and belongs in the cavaticus kinship. The length of costulae of the new species are short, ending far of the insertion of lamellar setae and strongly converging (much longer and reaching to the insertion of costulae in O. etruscus ). Its apodemes 4 double lines and sternal apodema between apodemes 2 and 3 present (apodemes 4 simple in etruscus and sternal apodema between ap. 2 and 3 absent in O. etruscus ).

Etymology. Named after its country origin.

Figures

Figs 16–18. Oribellopsis grecus sp. n.: 16 = body in dorsal view, 17 = body in ventral view, 18 = podosoma in lateral view

Figs 19–22. Oribellopsis grecus sp. n.: 19 = lateral region of prodorsum, 20 = sensillus, 21 = exobothridial region, 22 = seta ro