Pionacercus Piersig, 1894

Gerecke, R., 2014, Pseudofeltria (Acariformes: Pionidae) In Europe: Three Previously Described Taxa, A Species New To Science From The Northern Apennines, And A Redefinition Of Foreliinae, Acarologia 54 (1), pp. 57-67 : 59

Genus Pionacercus Piersig, 1894

Diagnosis — Idiosoma soft in female, but with extensive sclerotizations in male, including dorsal and ventral shields. Medial margin of Cx-IV well developed in males, but more or less reduced in females. In males, Cx-III+IV fused medially and with genital plate, occasionally also with Cx-I+II to a ventral shield; in females, coxal plates in four groups. Male IV-L-4 dorsodistally with a group of strong setae, but not forming a spur. IV-L-6 bowed, with 5-10 peg-like setae on concave margin. Genital field with three pairs of acetabula, in females triangular genital plates flanking membranous gonopore with acetabula covering only restricted parts of the plate, medial and lateral margins between anterior and posterior acetabula straight or bowed. Males without petiole. P-4 mediodistally with small peg-like seta.

Discussion — Material of three species of the genus was taken in study in order to document both, the distinctive character states for separating it from Pionacercopsis , and the synapomorphies with Pseudofeltria .