Gaeolaelaps, Evans et Till, 1966

Trach, V. A., 2016, Three New Unusual Beetle-Associated Species Of The Genus Gaeolaelaps (Acari, Mesostigmata, Laelapidae) From Ukraine, Vestnik Zoologii 50 (1), pp. 3-16 : 15

Кey to the species of Gaeolaelaps with extra short peritremes (females)

1. Dorsal soft cuticle hypertrichous (with more than 30 pairs of setae); sternal shield with three pairs of lyrifissures. ........................................................................................................................................................... 2

— Dorsal soft cuticle non hypertrichous (with less than 15 pairs of setae); sternal shield with two pairs of lyrifissures. ........................................................................................................................................................... 3

2. Peritrematal shields long, extending to level of coxae I; dorsal shield with 39 pairs of setae (Px2–3 present). ............................................................................................................................. G. carabidophilus Trach, 2012

— Peritrematal shields very short (extending to posterior level of coxae III); dorsal shield with 37 pairs of setae and one unpaired medial seta Jx. ................................................................. G. khaustovi Trach , sp. n.

3. Dorsal shield elongate oval, sharply tapering posteriorly from setae r4. .................................................... 4

— Dorsal shield obovate, not sharply tapering posteriorly from setae r4. ......................................................... ......................................................................... G. rhizotrogi ( Mašán, 1998) and G. dubininae ( Sklyar, 2012)

4. Dorsal shield with 39 pairs of setae (Px2–3 present); epigynal shield strongly tapering anteriorly of setae st5; peritremes short (length / width ratios ≈ 5.5–7). ......................................... G. heteroceri Trach , sp. n.

— Dorsal shield with 37 pairs of setae (Px2–3 absent); epigynal shield slightly tapering anteriorly of setae st5; peritremes very short (length / width ratios ≈ 2). .................................... G. sevastianovi Trach , sp. n.