Review of the genera Berlesia Canestrini, 1884, and Katydiseius Fain & Lukoschus 1983, the subfamily Katydiseiinae Fain & Lukoschus, 1983, and their family group relationships (Acari: Mesostigmata: Gamasina), with description of three new species parasitic on gryllacridid crickets (Orthoptera) Author Lindquist, Evert E. Author Oconnor, Barry M. 0000-0003-4588-0788 Department of Ecology and Evolutionary Biology, Museum of Zoology, University of Michigan, Ann Arbor, Michigan, 48108, USA. bmoc @ umich. edu, https: // orcid. org / 0000 - 0003 - 4588 - 0788 Author Shaw, Matthew D. 0000-0002-5037-3740 Terrestrial Invertebrates, South Australian Museum, North Tce, Adelaide 5000, South Australia, Australia matthew. shaw @ samuseum. sa. gov. au, https: // orcid. org / 0000 - 0002 - 5037 - 3740 Author Sidorchuk, Ekaterina A. Arthropoda Laboratory, Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya ulitsa 123, 117997 Moscow, Russia. International Complex Research Laboratory for the Study of Climate Change, Land Usage, and Biodiversity, Tyumen State University, 10 Semakova Str., 625003, Tyumen, Russia. text Zootaxa 2020 2020-09-28 4857 1 5 70 journal article 9059 10.11646/zootaxa.4857.1.4 c4a1490d-15c3-446f-8676-e6c80096bcb6 1175-5326 4396474 F0AF75AD-BAE2-4B7D-9CCB-3D9477F350BD Key to genera and species of Katydiseiinae , adult females 1. Dorsal vertex setae j1 absent (not to be confused with j3 , present slightly behind level of poroids id-1 ); sternal shield reduced, bearing only setae st1 , without endopodal extensions between bases of legs I–II and II–III; anal shield with paranal setae inserted at mid-level of anus; subcapitulum with hypostome prolonged anteriorly by two paramedian processes reaching level of palptibia and enveloping extremities of internal malae and labrum; coxa of legs I–IV with all setae setiform; genua of legs I-II-III with 8-6-6 setae, each lacking al-2, pl-2......................................................................................................... Genus Katydiseius , monobasic, K. nadchatrami Fain & Lukoschus, 1983 - Dorsal vertex setae j1 present (inserted slightly anteromediad poroids id-1 , closely anterior to j3 ); sternal shield well developed, bearing setae st1 , st2 , with endopodal extensions between bases of legs I–II and II–III; anal shield with paranal setae inserted at level of, or behind, posterior margin of anus; subcapitulum with sclerotized extensions of hypostome extended only as corniculi to level of palptrochanter, but with flexible mouthpart structures (salivary styli, internal malae, labrum) extending freely to level of palpgenu; coxa of legs I–III and sometimes IV each with one seta strongly bulbiform basally; genua of legs I-II-III with minimally 11-10-9 setae, each with al-2, pl-2 ... Genus Berlesia Canestrini, 1884 ............................... 2 2. Coxal seta of leg IV conspicuously bulbiform, similar to one of coxal setae on each of legs I–III and subcapitular setae pc ; anal shield lateral margins nearly parallel; tarsi II–IV each with one of apical setae distinctively longer than adjacent setae and as long as entire pretarsus.............................................................. B. rapax Canestrini, 1884 - Coxal seta of leg IV setiform, in contrast to a bulbiform coxal seta on each of legs I–III and subcapitulum; anal shield subrhomboidal, lateral margins angular; tarsi II–IV each with apical setae similar in length, none as long as entire pretarsus........ 3 3. Vertex setae j1 moderately long, z1 present; dorsal shield with mid–dorsal setae ( j4–j6, z5, J1–J3 ) also moderately long ( J2 present), e.g., j4 nearly as long as interval j4–j5 ; dorsal shield flanked by about 25 pairs of setae, mostly of the hypertrichous r–R and S series; soft opisthogastric cuticle also hypertrichous, with about 15 pairs of setae........... B . multisetosa n. sp. - Vertex setae j1 short, z1 absent; dorsal shield with mid-dorsal setae also short ( J2 absent), e.g., j4 ca one-fourth as long as interval j4–j5 ; dorsal shield flanked by at most 15 pairs of setae mostly of the r–R and S series; soft opisthogastric cuticle with at most 7 pairs of setae................................................................................... 4 4. Dorsal shield with setae j3 and z4 very long, longer than diagonal interval j3–z4 and twice as long as transverse interval j3–j3 , and with setae J4 absent; metapodal plates ovoid, nearly as wide as long; dorsal palpfemoral seta d extending beyond apex of palpgenu; leg I genu and tibia each with 10 or 11 setae, third ventral ( av-2 ) absent.................... B. vorontsovi n. sp. - Dorsal shield with setae j3 and z4 moderately long, shorter than interval j3–z4 and no longer than interval j3–j3 , and with minute setae J4 present; metapodal plates slender/baculiform, three times as long as wide; dorsal palpfemoral seta d extending to about mid-level of palpgenu; leg I genu and tibia each with 12 setae, third ventral ( av-2 ) present....... B. hospitabilis n. sp.