Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 92. (Budapest 2000)

Mahunka, S.: Some oribatid mites from Yemen (Acari: Oribatida) (Acarologica Genavensia LXXXVIII)

Lasiobelba arabica sp. n. (Figs 10-15) Material examined - Holotype: Yemen 3757. Holotype: MHNG. Description - Measurements: Length of body: 490 pm, width of body: 287 pm. Prodorsum: Rostral part elongate, rostrum roundish. Prodorsal surface without well sclerotised costulae or crests, two pairs of sigilla present in the intcrbothridial region, some larger ones visible laterally. Behind the intcrbothridial sigilla an arched line is present. Bothridia relatively small, nearly quadrangular. All four pairs of prodorsal setae strong, setiform, distinctly ciliate. Rostral and lamellar setae thicker and more pilose than the others, interlamellar setae shortest and thinnest of all. Sensillus long, gradually dilated distally with a sharply end, but without typical clavate head. The distal part well pilose (Fig. 10). Notogaster: Roundish and well convex in lateral view. Ten pairs of notogastral setae present, setae c> short, simple, all others long, bearing some cilia. Setae la arising clearly in front of lm (Fig.10). Lateral part of podosoma: Position of the acetabula of the legs is characteristic, acetabula III and IV located much above acetabula I-II. Exobothhridial region and a field between acetabula II and III well granulated. Pedotecta I large, their dorsal margin undulate, pedotecta IT

—III reduced, discidium long, with sharply pointed tip. Ventral parts of the body (Fig. 11): Epimeral borders and apodemes excepting the longitudinal sternal border normally developed, the mentioned part slightly excavated and median epimeral borders removed from each other. Between them the parts of sternal apodeme well visible. Epimeral setal formula: 3 - 1 - 3 - 3. Among them setae la, 2a and 3a simple and short, all others well ciliate, setae lc located medially, far from the tectopedia I, on the margin of epimer I, shorter than setae lb. Setae 3c and 4c very long, the lattere arising close to the top of discidium. Anogenital setal formula: 5 -1-2-3. Position of the aggenital setae normal, setae ad, in postanal position. Setae in this region mostly well ciliate, adanal ones thicker than the others. Infracapitulum, chelicera and palps belonging to the normal type. Legs: Joints of all legs elongated. Tarsi of legs III and IV conspicuously long. Some setae on all legs, especially on trochanter, femora and genu well dilated, thick and spiniform, some of them also ciliate. Seta /' of genu IV much longer than the other setae. Setae v" short and plumose, seta /' much longer. Setae v" and a" on tarsi IV also plumose. Setae p on tarsi III and IV short, spiniform. Legs setal formulae: 1:1-5-2+1-4+2- 20+2 - 1 (Fig. 13). IV: 1 - 2-2-3+1 - 12- 1 (Fig. 15). Remarks - The new species is well characterised by the spiniform, dilated setae on the legs and the shape of the sensillus. This combination of characters was unknown in this genus. Etymology - Named after its origin.