Adrodamaeus 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 : 29

Adrodamaeus Paschoal, 1982 (p. 450 in Paschoal & Johnston, 1982)

Type species Damaeus magnisetosus Ewing, 1909

Diagnosis: Gymnodamaeidae with ventral plate with anogenital bridge ( Fig. 12 ), but without lateral pits; genital plates with smooth median margin and bearing 7 pairs of setae, seta g 2 inserted posteriad g 1; 3 pairs of adanal setae. Tarsus, genu, and tibia of all legs with basal retrotecta that cup distal ends of previous segment ( Figs. 13–14 ); femur IV with 2 setae. Prodorsum with mound-like cerotegument between bothridia ( Figs. 9– 10 ), rostral ridges, and spherical pustules; sensillus (bo) with long stalk and narrow, barbed head ( Fig. 10 ); bothridial rim simple, bothridial ridge poorly developed; spine-like interlamellar setae (in) sessile or on short apophysis slightly anteriad bothridia, directed dorsally, not opposed to the small median prodorsal tubercle; exobothridial seta (ex) inserted slightly anteriad in; prelamellar ridge poorly developed, without steep anterior margin; rostral seta (ro) inserted just posteriad lamellar seta; lamellar seta (le) inserted near ro, curved mediad; pedotectum II rounded distally. Notogaster low, rounded, with a short antero-median ridge, smooth outer margin except for pair of antero-lateral tubercles ( Fig. 10 arrow), 5 pairs of setae (h 1-2, p 1-3); cerotegument with spherical pustules and a pattern of raised ridges and cells ( Fig. 9 ), posterior median nipple-like process absent; notogastral setae h 1-2 on short apophyses; sejugal tubercle vestigial, small triangular process at base of leg III.

Figures

FIGURES 9 – 14. Adrodamaeus magnisetosus (Ewing, 1909), Ontario, Canada; scale bars = 0.1 mm, except Fig. 11 = 1 μm. 9, Adult, dorsal view with cerotegument intact; 10 Adult, dorsal view with notogastral cerotegument scraped off to show lateral (arrow) and median ridges; 11, Notogastral pustules (and fungal hyphae); 12, Light micrograph of venter showing ano-genital bridge (arrow); 13, Genu III joints with femur (top) and tibia showing retrotecta (arrows); 14, Genu IV joints with femur (top) and tibia showing retrotecta (arrows).