Pergalumna bicristata, 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 : 16-18

Pergalumna bicristata sp. n.

( Figs 32–34 )

Diagnosis: Rostral part elongated anteriorly in dorsal view. Lamellar and sublamellar lines well developed, lamellar setae arising between lamellar lines. Sensillus simple, thin, setiform, smooth. Dorsosejugal scissure interrupted medially, directed to alveoli of interlamellar setae. Three pairs of small, rounded areae porosae and 10 pairs of setal alveoli present. Pair of distinct, longitudinal crista between posterior areae porosae (A 3). Four pairs of epimeral setae, 1a longer than others. Six pairs of genital setae, 3 pairs arising along the anterior margin. Aggenital, anal and adanal setae minute. Postanal area porosa absent.

Material examined: Holotype: Madagascar, Vohimana reserve, primary forest. 17. 04. 2008. Leg. CS. CSUZDI (Afr-996), 1 paratype from the same sample. Holotype (1816-HO-10) and paratype (1816-PO-10) deposited in the HNHM .

Measurements: Length of body: 552–580 µm, width of body: 412–428 µm.

Prodorsum: Rostral part wide, elongated anteromedially. Lamellar and sublamellar lines observable also in dorsal view. Rostral and lamellar setae short, thin, interlamellar setae reduced, only their alveoli observable. Sensillus thin, setiform, smooth, directed laterally. Areae porosae Ad hardly observable, small.

Notogaster: Pteromorphs with fine sculpture, consisting of thin lines. Dorsosejugal scissure interrupted medially, directed to insertion of interlamellar setae. Dorsophragmatic apophyses large, long. A pair of distinct, characteristic parallel crista present in posterior part of notogaster, between setae h 1 and porose areas A 3. Three pairs of small, round porose areas present, Aa located medially, near to each other. Median pore absent. Notogastral setae absent, their alveoli small.

Lateral part of podosoma: Lamellar and sublamellar lines well-developed, running parallel, comparatively near to each other. Lamellar setae arising between lamellar lines. Pedotecta I absent.

Ventral parts: Metum very large. Epimeral setae, except 1a, represent only by their alveoli. Six pairs short genital setae, three pairs arising on the anterior margin of the genital plates, other located near to lateral margin of plates. Aggenital setae minute, anal and adanal setae also minute. Postanal porose area absent.

Legs: All legs tridactylous.

Remarks: See the remarks after the following species.

Etymology: The name refers to the presence of a pair of crista in the posterior region of the notogaster.

Figures

Figs 32–34. Pergalumna bicristata sp. n.: 32 = body in dorsal view, 33 = body in ventral view, 34 = podosoma in lateral view