New feather mites of the subfamily Pterodectinae (Acari: Astigmata: Proctophyllodidae) from passerines (Aves: Passeriformes) in Mato Grosso do Sul, Brazil Author Mironov, Sergey V. Zoological Institute, Russian Academy of Sciences, Universitetskaya Quay 1, 199034 Saint Petersburg, Russia. E-mail: astigmata @ zin. ru Department of Biology and Wildlife Diseases, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences, Palackeho 1 - 3, 612 42 Brno, Czech Republic. E-mail: literaki @ vfu. cz Institute of Vertebrate Biology ASCR, v. v. i., Kvetna 8, 603 65 Brno, Czech Republic. E-mail: capek @ ivb. cz Corresponding author Author Literak, Ivan Author Čapek, Miroslav text Zootaxa 2008 2008-12-01 1947 1 38 journal article 1175­5334 Genus Tyrannidectes Mironov gen. n. Type species: Tyrannidectes berlai Mironov sp. n. Both sexes . Moderately elongated pterodectines. Vertical setae ve absent. All hysterosomal setae present. Prodorsal shield covering most of prodorsum, with well developed posterior angles. Scapular shields not developed dorsally. Humeral shields represented by rudimentary plates situated ventrally or absent. Setae c2 situated laterally or dorso-laterally on striated tegument. Setae wa anterior to setae la and ra on tarsi I, II . Seta gT of tibia I in distal half of segment. Setae cG and mG on genua I, II setiform. Solenidion σ 1 of genu I much shorter than solenidion ω 3 of corresponding tarsus. Femora I, II usually bear ventral crest, other segments of these legs without processes and other modifications. Seta sR of trochanters III absent; solenidion σ 1 of genu III present. Supranal concavity well developed. Male . Epimerites I fused into a V or narrow U, fused part not connected with epimerites II. Coxal fields II–IV open; epimerites II and IV without extensive sclerotized areas. Opisthosomal lobes moderately elongated, approximately as long as wide, with roughly rounded posterior margin. Terminal cleft as a wide inverted U. Setae h3 short, narrowly lanceolate, situated on lobar apices. Setae h1 situated anterior to bases of opisthosomal lobes. Setae ps1 setiform, minute. Genital arch with well developed branches, situated at level of trochanters IV; aedeagus ensiform, much longer than genital arch. Genital papillae anterior to genital arch. Pregenital apodeme, paragenital apodemes, genital shield and other sclerotized structures around genital apparatus absent. Setae 4a situated on soft tegument of coxal fields IV. Opisthoventral shields present, narrow. Corolla of anal suckers without indentation; suckers surrounded by membrane with radial striation. Adanal shields absent. Setae ps3 postero-lateral to anal suckers. Setae g and ps 3 in high trapezoid arrangement. Legs I slightly thicker and longer than legs II. Legs III and IV subequal in size. Solenidia ϕ of legs IV longer than on legs III. Tarsus IV without apical claw-like process, setae d and e button-like. Female . Epimerites I fused into a narrow U. Lobar region of opisthosoma clearly separated from remaining part of opisthosoma; opisthosomal lobes well developed, with long terminal appendages. Hysteronotal shield split dorsally into anterior and lobal shields. Macrosetae h2 spindle-like. Epigynum horseshoe-shaped, large. Translobar apodemes present. Legs I slightly thicker and longer than legs II. Legs III, IV subequal in size; genu IV dorsally inflated. Solenidia ϕ of tibiae III much longer than on tibiae IV. Hosts: Birds of the family Tyrannidae (Passeriformes) . The genus is monotypic. Differential diagnosis. By most diagnostic features listed above, the new genus is similar to Pterodectes , particularly to its species of the gracilis group, which are characterized by the position of setae c2 on humeral shield or dorso-laterally on soft tegument. Tyrannidectes clearly differs from Pterodectes by the absence of trochanteral seta sR on trochanters III ( Fig. 14 C ). Etymology. Contraction of the host family Tyrannidae and Pterodectes , masculine.