Heydeniella Richters

Castilho, Raphael C., Silva, Edmilson S., De, Gilberto J. & Halliday, Bruce, 2016, Catalogue of the family Ologamasidae Ryke (Acari: Mesostigmata), Zootaxa 4197 (1), pp. 1-147 : 15

Heydeniella Richters (6 described species)

Movable and fixed cheliceral digits with three and 3–5 teeth, respectively. Epistome with an anteromedian extension wider at base. Seta h 3 about in longitudinal line with h 1 and in transverse line and mediad to h 2. Idiosoma suboval, 580–1440 µm long and 520–980 µm wide at widest level. Podonotal and opisthonotal shields fused, forming holonotal shield. Dorsal idiosomal setae aciculate. Podonotal region of dorsum with 16–21 pairs of setae, of which 16–21 pairs on podonotal shield and without setae on soft integument along lateral margins of podonotal shield. Opisthonotal region with 16–21 pairs of setae, of which 16–21 pairs on opisthonotal shield and without setae on soft integument along lateral margins of opisthonotal shield. Seta j 1 not on prominent protuberance, shorter than r 3 and Z 5 (as long as r 3 in H. sherrae ). Holonotal and ventrianal shields fused. With one pair of presternal platelets. Sternal shield fused to endopodal shield near coxa IV; seta st 4 laterad to imaginary line between st 1– st 3. Opisthogaster without platelets between genital and ventrianal shields; with 7–8 pairs of setae on ventrianal shield and without setae on soft integument around ventrianal shield; post-anal seta as long as or shorter than para-anal seta. Peritreme with straight or smoothly curved margins, extending anteriorly to level between anterior margin of coxa II and coxa I. Peritrematal shield fused posteriorly to exopodal shield near coxa IV and to ventrianal shield, with connection behind stigma wider than peritreme. Exopodal shields near coxae II–III–III divided at median level of coxa III. Without distinct metapodal platelets. All legs with pretarsi. Genua I, III and IV and tibia IV with 13, 9, 9–10 and 10 setae, respectively.