Orbiculobates, Grandjean, 1961

Ermilov, Sergey G., 2023, Taxonomic contribution to the knowledge of the oribatid mite genus Orbiculobates (Acari, Oribatida, Plasmobatidae), Persian Journal of Acarology 12 (3), pp. 393-402 : 399

KEY TO KNOWN SPECIES OF ORBICULOBATES

1. Bothridial seta with well-developed clavate head; body length: 360 ............................................... .................................. Orbiculobates transvectus ( Grandjean, 1929) . Distribution: Lesser Antilles.

– Bothridial seta setiform or with slightly developed elongate head ................................................ 2

2. Interlamellar seta represented by alveolus ..................................................................................... 3

– Interlamellar seta represented by seta ............................................................................................ 4

3. Bothridial seta medium-sized (equal to distance between bothridia), setiform; rostral seta simple; seven pairs of genital setae; aggenital setae present; propodolateral apophysis absent; body length: 384 .............. Orbiculobates schubarti ( Pérez-Íñigo & Baggio, 1988) . Distribution: Brazil.

– Bothridial seta long (clearly longer than distance between bothridia), with slightly developed elongate head; rostral seta stickle-like; six pairs of genital setae; aggenital setae absent; propodolateral apophysis present; body length: 360 ........................................................................ ................................. Orbiculobates acutirostrum ( Hammer, 1973) . Distribution: Western Samoa.

4. Bothridial seta long (clearly longer than distance between bothridia), subflagellate; interlamellar seta simple; notogaster without exuvial scalps; body length: 430 ................................................... ..................................... Orbiculobates australis Balogh & Csiszár, 1963 . Distribution: Argentina.

– Bothridial seta medium-sized (equal to distance between bothridia), with slightly developed elongate head; interlamellar seta bifurcate; notogaster with exuvial scalps .................................. 5

5. Notogaster flattened; rostral seta dilated in median part; opisthonotal gland opening slightly protruding; one pair horn-like structure in the epimeral region and a horn-like structure on the lateral side of body present; spines on anterior margin of the notogaster absent; body length: 360–390 ................................................. Orbiculobates bicornutus sp. nov. Distribution: Mexico.

– Notogaster convex; rostral seta simple; opisthonotal gland opening strongly protruding, tubular; horn-like structures in the epimeral region and on the lateral side of body absent; spines on anterior margin of the notogaster present; body length: 330 ........................................................... ................................................. Orbiculobates orbiculus ( Grandjean, 1929) . Distribution: Antilles.