Pergalumna infinita, Mahunka, 2011

Mahunka, S., 2011, New And Little Known Oribatid Mites From Madagascar (Acari: Oribatida) Ii., Acta Zoologica Academiae Scientiarum Hungaricae 57 (1), pp. 1-21 : 18-20

Pergalumna infinita sp. n.

( Figs 35–37 )

Diagnosis: Rostral part very wide, rounded. Lamellar and sublamellar lines well developed, setae le distinctly located between lines L and L. Interlamellar setae reduced, represent by their alveoli. Sensillus directed backwards, with slightly lanceolate distal end. Dorsosejugal scissure interrupted medially, directed to insertion of interlamellar setae. Ten pairs of setal alveoli and three pairs of areae porosae. Areae porosae A 1 much larger than the others. Epimeral setae short and minute. Six pairs of genital setae, 3 pairs arising along the anterior margin. Aggenital, anal and adanal setae minute. Postanal porose area absent.

Material examined: Holotype: Madagascar, Vohimana reserve , primary forest. 17. 04. 2008. Leg. CS. CSUZDI. (Afr-996), 4 paratypes from the same sample. Holotype ( 1817-HO-10 ) and 3 paratypes ( 1817-PO-10 ) deposited in HNHM , 1 paratype in MHNG .

Measurements: Length of body: 280–318 µm, width of body: 225–253 µm.

Prodorsum: Rostrum wide, widely rounded in dorsal view. Lamellar and sublamellar lines well-developed, running parallel. Rostral and lamellar setae nearly equal in length, short, thin. Lamellar setae located medially, between the lamellar lines. Interlamellar setae reduced, represented only by distinct alveoli. Sensillus long, directed backwards, it distal end slightly dilate, lanceolate, this part well pilose.

Notogaster: Pteromorphs with distinct sculpture. Dorsosejugal scissure characteristically directed forwards, to insertion of interlamellar setae. Areae porosae Ad present laterally, in longitudinal position, near to dorsosejugal furrow. Notogastral setae absent, their alveoli well-developed. Three pairs of porose areas present, Aa small, narrow, located far from alary furrow, A 1 larger of all, A 2 reduced, A 3 oval, slightly larger than Aa. Median pore absent.

Lateral part of podosoma: Pedotectum I small, hardly observable.

Ventral parts: Mentum very wide, concave medially. Epimeral setae presented only by their alveoli. Six pairs of minute or very short genital setae, three pairs arising on the anterior margin of the genital plates. Aggenital, anal and adanal setae also minute. Postanal porose area absent.

Legs: All legs tridactylous.

Remarks: Species of Pergalumna living in Madagascar are either endemic or only very rarely occurring in other regions. Therefore, I give a key completed with some species from Mauritius:

1 Dorsal surface of notogaster striate or bearing longitudinal crests 2

– Dorsal surface of notogaster smooth, at most punctate 3

2 Dorsal surface of notogaster striate. Mauritius strigulata MAHUNKA, 1978

– Dorsal surface of notogaster with a pair of strong crests. Madagascar bicristata MAHUNKA, 1978

3 Areae porosae A 1–2 much larger than Aa 4

– Areae porosae Aa, A 1–2 and A 3 equal large 5

4 Interlamellar setae very long, longer than the lamellar setae. Madagascar andasibe MAHUNKA 1996

– Interlamellar setae short, or absent. Madagascar infinita sp. n.

5 Interlamellar setae long, as long as the lamellar setae. Mauritius mauritii MAHUNKA, 1978

– Interlamellar setae short, or absent 6

6 Dorsosejugal scissure directed anteriorly, to the insertion of interlamellar setae. Mauritius. filifera MAHUNKA, 1978

– Dorsosejugal scissure in transversal position. Madagascar. fastigiata MAHUNKA, 1996

Etymology: The name refers to the form and direction of the dorsosejugal furrow.

Figures

Figs 35–37. Pergalumna infinita sp. n.: 35 = body in dorsal view, 36 = body in ventral view, 37 = podosoma in lateral view