Heterogamasus Trägårdh

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

Heterogamasus Trägårdh (5 described species)

Movable and fixed cheliceral digits with 3–4 and five 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, 620–650 µm long and 390–450 µm wide at widest level. Podonotal and opisthonotal shields separated. Dorsal idiosomal setae pilose. Podonotal region of dorsum with 19–22 pairs of setae, of which 19–22 pairs on podonotal shield and 0–2 pairs on soft integument along lateral margins of podonotal shield. Opisthonotal region with 21–24 pairs of setae, of which 15–24 pairs on opisthonotal shield and 0–9 pairs on soft integument along lateral margins of opisthonotal shield. Seta j 1 inserted on tubercle, longer than r 3 and Z 5. Opisthonotal and ventrianal shields not fused. With 0–1 pair of presternal platelets. Sternal shield not fused to endopodal shield near coxa IV; setae st 1– st 4 in longitudinal line. Opisthogaster with 0–4 platelets between genital and ventrianal shields; with 4–6 pairs of setae on ventrianal shield and 0–4 pairs on soft integument around ventrianal shield; post-anal seta as long as para-anal seta. Peritreme with straight or smoothly curved margins, extending anteriorly to level of coxa I. Peritrematal shield not fused or fused posteriorly to exopodal shield near coxa IV, with connection behind stigma wider than peritreme. Exopodal shields near coxae II–III–III divided at median level of coxa III or exopodal shields absent. Without distinct metapodal platelets. All legs with pretarsi. Genua I, III and IV and tibia IV with 13, 10, 10 and 10 setae, respectively. Setae av2, pv2 on tibia I long, thick, spine-like.