Trichogalumna nabhitabhatai, Mahunka, 2008

Mahunka, S., 2008, A New Genus And Some Other Data Of Oribatids From Thailand (Acari: Oribatida), Acta Zoologica Academiae Scientiarum Hungaricae 54 (2), pp. 125-150 : 148-149

Trichogalumna nabhitabhatai sp. n.

( Figs 50–52 )

Diagnosis: Rostrum wide, rounded. Lamellar and sublamellar lines well developed, running parallel. Prodorsal setae setiform, lamellar setae the longest and strongest, interlamellar setae the shortest and thinnest of all. Sensillus fusiform, with distal spines. Dorsosejugal suture absent. Ten pairs of well developed notogastral setae and four pairs of small, round porose areas present. An unpaired posteroanal porose area observable. All legs tridactylous.

Material examined: Holotype: Thailand, Province Prachin Buri, Sakaerat Research Station . 15. 06. 2001. 06. 15. Leg. HORVÁTH , E. & SZIRÁKI, GY. (As-804). 22 paratypes from the same sample. Holotype (1746-HO-2007) and 20 paratypes (1746-PO-2007): HNHM , two paratypes: MHNG .

Measurements: Length of body: 314–333 µm, width of body: 238–252 µm.

Prodorsum: Rostal part of prodorsum wide, without characteristic apex. Lamellar and sublamellar lines long, well observable. Rostral and interlamellar setae short, latter ones very fine. Lamellar setae situated in relatively far distance from the lamellar lines, thicker than the preceding ones, distinctly pilose. Peduncle of sensillus long, its head large, asymmetric, with a large ventral and some small distal spines ( Fig. 50 ).

Notogaster: Outer surface of pteromorphae with some stronger lines, pteromorphal setae comparatively long. Dorsosejugal suture absent. Sejugal porose area small. Ten pairs of well visible, fine setae and four pairs of areae porosae present. All porose areae round, small, equal in size, A 2 and A 3 relatively nearly situated to each other.

Lateral part of podosoma: Both prodorsal lines well developed, gradually arching toward the margin of the coxisternal region ( Fig. 52 ), running parallel to each other. Pedotecta 1 narrow.

Ventral regions ( Fig. 51 ): Epimeral borders and apodemata weakly developed, short. Epimeral surface ornamented by some large irregular spots. Four pairs of minute epimeral setae present. Three pairs setae inserted on the anterior margin of genital plates. Lyrifissures iad located at the level of anteriorn margin of anal aperture. An unpaired of small, round areae porosae A p present.

Legs: All legs triheterodactylous.

Remarks: The new species well characterised by the long lamellar and short, fine interlamellar setae, the form of the sensillus, and especially by the four pairs of equal notogastral and one unpaired postanal porose areas. This form of the porose areas was unknown in the heretofore known Trichogalumna species. It stands nearest to T. madagassica (MAHUNKA, 1996) however; the form of the porose areas is different in the latter species.

Etymology: I dedicate the new species to JARUJIN NABHITABHATA, director of the Natural Science Research Division of the National Science Museum, Patumthani, Thailand for his help in the collecting activities of EDIT HORVÁTH and Dr. GYÖRGY SZIRÁKI.

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Acknowledgements – First of all I should like to thank the collectors: EDIT HORVÁTH, ANDRÁS OROSZ, LÁSZLÓ PEREGOVITS, Dr. GYÖRGY SZIRÁKI of this very interesting material. Special thanks are due to Dr. CSABA CSUZDI, for the help extended while preparing my manuscript. I should like to thank Dr. LAJOS ZOMBORI for reviewing the English text of my paper and for translating some paragraphs. My thanks are also due to Dr. W. NIEDBAŁA (Poznan) and Dr. B. BAYARTOGTOKH (Ulaanbaatar) for their valuable comments on an earlier version of the text. This work was supported by the Hungarian Scientific Research Fund (OTKA number T45889).

Figures

Figs 50–52. Trichogalumna nabhitabhatai sp. n. – 50 = body in dorsal view, 51 = body in ventral view, 52 = rostral part of prodorsum in lateral view