Oribotritia mahunkai, Niedbała & Starý, 2013

Niedbała, W. & Starý, J., 2013, Contribution To The Knowledge Of Ptyctimous Mites (Acari: Oribatida) From Madagascar, Acta Zoologica Academiae Scientiarum Hungaricae 59 (4), pp. 337-345 : 338-340

Oribotritia mahunkai sp. n.

(Figs 1A-F)

Diagnosis – Twopairsoflateralcarinaeonprodorsum, dorsallymarked strongerthanventrally. Sensillashort, dilatedmedially. Notogastralsetae short, rigid, exceptfiliformsetae c 3 and p 3.

Aggenitalsetae ag 1 considerablyshorterthansetae ag 2. Onepairof minuteanalsetaeandthreepairsoflongeradanalsetae; distancebetween setae ad 1 and ad 2 islongerthanbetweensetae ad 2 and ad 3; lyrifissures iad situatedlaterallyatlevelof ad 2 setae.

Measurementsofholotype – Ratherlargespecies, prodorsumlength 439, width 343, height 146, sensillum 73, setae: interlamellar 94, lamellar 111, rostral 76; notogaster: length 808, width 586, height 545, setae c 1 83, c 1 / c 1 - d 1 = 0.5, h 1 76, p 1 68; genitalandaggenitalplates 207 × 116, analandadanalplates 404 × 101.

Description – Colourlighttodarkbrown. Bodysurfacefinelyporose.

Prodorsum (Figs 1A, B) withtwopairsoflateralcarinae, dorsallywellmarked, ventrallyweaker, shorterandconvergentinproximalpart. Sensilla (Fig. 1C) rathershort, rigid, smooth, slightlydilatedmedially; interlamellarandrostralsetaeshort, erect, rough; lamellarsetaeprocumbent, filiform; exobothridialsetaevestigial.

Notogaster (Fig. 1E) withshort, rigidsetae, exceptforslightlylongerandfiliform setae c 3 and p 3. Setae c 1 and c 2 remotefromanteriormargin, setae c 3 nearthemargin. Openingofopisthosomalgland, fivelyrifissuresandtwovestigialsetaepresentandpositioned asnormalforthegenus.

Ventralregion (Fig. 1D). Setae h ofmentumconsiderablylongerthandistancebe- tweenthem. Genitalplateswithninepairsofsetae, setae g 1–5 smalleranddistancedfrom setae g 6–9; twopairsofaggenitalsetaepresent, setae ag 1 considerablyshorterthansetae ag 2. Anogenitalcleft trv ratherlong. Onepairofminuteanalsetaeandthreepairsoflonger adanalsetaepresent; distancebetweensetae ad 1 and ad 2 longerthanbetweensetae ad 2 and ad 3. Lyrifissures iad situatedlaterallyatthelevelofsetae ad 2.

Figs 1A–F. Oribotritiamahunkai sp. n.: A = prodorsum, dorsalview, B = prodorsum, lateral view, C = sensillum, D = rightventralside, E = opisthosoma, lateralview, F = trochanter andfemuroflegI.

Legs (Fig. 1F). Chaetomeoflegs (withouttarsi): I: 1–4–5(2)–5(1), II: 1–4–4(1)–3(1), III:

3–2–3(1)–3(1), IV: 3–2–2(1)–3(1); tarsiheterotridactylous.

Materialexamined. Holotypeandeightparatypes: MAG-034, ABT/13/2011/, Mada- gascar, AmbohitantelySpeciesReserve, 20.IV.2011, GPS-coordinates 18°11’22,4”S, 47°17’38,9”E, altitude 1631 m, secondaryforest, siftedsampleofforestlitterandfernresi- dues, leg. L. S. Rahanitriniaina, andR. Raveloson, oneparatype: MAG-038, ABT/18/2011/, Madagascar, AmbohitantelySpeciesReserve, 20.IV.2011,18°11’43,1”S, 47°17’16,1”E, alti- tude 1613 m, secondaryforest, siftedsampleofforestlitter, leg. L. S. Rahanitriniaina, and R. Raveloson, sevenparatypes: MAG-031, ABT/08/2011/, Madagascar, AmbohitantelySpe- ciesReserve, 19.IV.2011,18°11’51,8”S, 47°17’03,5”E, altitude 1533m, forestedge, siftedsampleofforestlitter, leg. P. Baňař, andR. Raveloson, oneparatype: MAG-035, ABT/15/2011/, Madagascar, AmbohitantelySpeciesReserve, 20.IV.2011,18°11’31,0”S, 47°17’33,3”E, alti- tude 1630 m, secondaryforest, siftedsampleofforestlitter, leg. L.S. Rahanitriniaina, and R. Raveloson, 15 paratypes: MAG-036, ABT/16/2011/, Madagascar, AmbohitantelySpecies Reserve, 20.IV.2011,18°11’43,5”S, 47°17’23,1”E, altitude 1636 m, secondaryforest, sifted sampleofforestlitter, leg. L. S. Rahanitriniaina, andR. Raveloson , 12 paratypes: MAG- 037, ABT/17/2011/, Madagascar, AmbohitantelySpeciesReserve, 20.IV.2011,18°11’43,1”S, 47°17’19,3”E, altitude 1636 m, secondaryforest, siftedsampleofforestlitter, leg. L. S. Ra- hanitriniaina, andR. Raveloson, 10 paratypes: MAG-014, ABT/10/2011/, Madagascar, AmbohitantelySpeciesReserve, 19.IV.2011,18°11’39,2”S, 47°17’12,6”E, altitude 1674 m, sifted sampleofplantresiduesunder Pandanus sp. , leg. L. S. RahanitriniainaandR. Raveloson. Holotypeand 18 paratypesaredepositedatDATE, 18 paratypesaredepositedatNHMG, and 18 paratypesatISB .

Comparison – Thenewspeciesischaracterisedbythepresenceoflat- eralcarinae, whicharedorsallywellmarked, ventrallyweaker, shorter, and convergentinproximalpart; theaggenitalsetae ag 1 areconsiderablyshorter thansetae ag 2 andthelyrifissures iad aresituatedlaterallyatthelevelof ad 2 setae. Theclosestrelated Oribotritiastriata Mahunka, 2009 hasgotasimilar constructionoflateralcarinae, shapeandlengthofprodorsalandnotogastral setae, presenceofonepairofanalandthreepairsofadanalsetaebutisdistinguishablebythelongitudinalstriationontheprodorsumandnotogaster, presenceofthreepairsofaggenitalsetaeandthelyrifissures iad aresituated laterallyandposteriorlyof ad 2 setae.