Rykellus Lee

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 : 22

Rykellus Lee (8 described species)

Movable and fixed cheliceral digits with 3–4 and 3–12 teeth, respectively. Epistome with an anteromedian extension wider at base, flanked or not by a pair of anterolateral spines, shorter than anteromedian extension. Seta h 3 about in longitudinal line with h 1 and posterior, in transverse line or anterior and mediad to h 2. Idiosoma suboval, 378–1060 µm long and 285–720 µm wide at widest level. Podonotal and opisthonotal shields fused by a distinct, complete and U-shaped line of fusion. Dorsal idiosomal setae aciculate and smooth. Podonotal region of dorsum with 19–22 pairs of setae, of which 19–22 pairs on podonotal shield and without setae on soft integument along lateral margins of podonotal shield. Opisthonotal region with 16–22 pairs of setae, of which 16–24 pairs on opisthonotal shield and 0–2 setae on soft integument along lateral margins of opisthonotal shield. Seta j 1 not on prominent protuberance, as long as or shorter than r 3 and shorter than Z 5. Opisthonotal and ventrianal shields separated. With a pair of presternal platelets. Sternal shield not fused or fused only by a narrow strip to endopodal shield near coxa IV; st 4 lateral to st 1– st 3. Opisthogaster with 0–4 pairs of platelets between genital and ventrianal shields; with 6–7 pairs of setae on ventrianal shield and 0–2 pairs on soft integument around ventrianal shield; postanal 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, with connection behind stigma wider than peritreme. Exopodal shields near coxae II–III–III fused or divided at median level of coxa III. With 0–1 pair of rounded metapodal platelets. All legs with pretarsi. Genua I, III and IV and tibia IV with 13, 9, 9–10 and 10 setae, respectively.