Pleodamaeus Paschoal 1982

Walter, David Evans, 2009, Genera of Gymnodamaeidae (Acari: Oribatida: Plateremaeoidea) of Canada, with notes on some nomenclatorial problems, Zootaxa 2206, pp. 23-44 : 37

Pleodamaeus Paschoal 1982 (p. 449 in Paschoal & Johnston, 1982)

Type species: Gymnodamaeus plokosus Woolley & Higgins, 1973 a

Diagnosis: Gymnodamaeidae with ventral plate lacking both anogenital bridge and lateral pits; genital plates with smooth median margin and bearing 7 pairs of setae, seta g 2 inserted posteriad g 1; 2 pairs of adanal setae. Legs without retrotecta on distal segments, femur IV with 3 setae. Prodorsum with spherical pustules, without X-shaped cerotegumental ridges; sensillus (bo) with long stalk and elongate, barbed head; bothridial rim simple, bothridial ridges arising mediad bothridia, interlamellar seta (in) spine-like, inserted on apophysis and forming enantiophysis with median prodorsal tubercle ( Fig. 30 ); exobothridial seta (ex) inserted posteriad in; rostral seta (ro) inserted at similar level to lamellar seta; lamellar seta (le) sinuate, inserted at steep anterior base of transverse prelamellar ridge ( Fig. 31 ); pedotectum II produced into a point laterally ( Fig. 31 ). Notogaster flattened, with shallow rim ( Fig. 27 ) and anterior field of coarse tubercles ( Figs. 29–30 ), without radiating cerotegumental folds or posterior median nipple, with 5 pairs of setae (h 1-2, p 1-3), setae h 1 inserted on posterior folds of notogastral rim, others sessile or on short apophysis; cerotegument with spherical pustules ( Fig. 28 ), raised ridges or cells not present; sejugal tubercle short, spur-like.

Figures

FIGURES 22 – 31. J oshuella agrosticula Paschoal, 1983, Alberta, Canada. 22, Dorsal view (arrow points to longitudinal notogastral ridge), scale bar = 0.05 mm; 23, Ventral view (arrow points to anogenital bridge), scale bar = 0.05 mm; 24, Posterior notogaster showing 4 pairs of setae, scale bar = 10 μm; 25, Notogastral pustules, scale bar = 1 μm; 26, Tritonymph with stacked scalps, scale bar = 0.05 mm. Pleodamaeus plokosus (Woolley & Higgins, 1973), South Dakota, USA. 27, Dorsal habitus, scale bar = 0.1 mm; 28, Notogastral pustule, scale bar = 1 μm; 29, Tubercular patch (arrow) on median anterior rim of notogaster, scale bar = 10 μm; 30, Light micrograph showing tubercular patch and median prodorsal tubercle. Pleodamaeus sp., Alberta, Canada. 31, Anterior notogaster and prodorsum showing acuminate pedotectum II (arrow), scale bar = 0.05 mm.