Chewing lice (Phthiraptera: Amblycera et Ischnocera) from wrens (Passeriformes: Troglodytidae), with description of a new species of Myrsidea Author Sychra, Oldřich 1,4) &) &) &) &) &) Department of Biology and Wildlife Diseases, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences, Palackého tř. 1 / 3, CZ- 612 42 Brno, Czech Republic; e-mails: sychrao @ vfu. cz, filipkounek @ seznam. cz, papouseki @ vfu. cz, sebastianfranco. py @ gmail. com, literaki @ vfu. cz & 1,4) &) Corresponding author Author Kounek, Filip 1,4) &) &) &) &) &) Department of Biology and Wildlife Diseases, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences, Palackého tř. 1 / 3, CZ- 612 42 Brno, Czech Republic; e-mails: sychrao @ vfu. cz, filipkounek @ seznam. cz, papouseki @ vfu. cz, sebastianfranco. py @ gmail. com, literaki @ vfu. cz Author Papoušek, Ivo 1,4) &) &) &) &) &) Department of Biology and Wildlife Diseases, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences, Palackého tř. 1 / 3, CZ- 612 42 Brno, Czech Republic; e-mails: sychrao @ vfu. cz, filipkounek @ seznam. cz, papouseki @ vfu. cz, sebastianfranco. py @ gmail. com, literaki @ vfu. cz Author Ćapek, Miroslav ) &) Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, v. v. i., KvČtná 8, CZ- 603 65 Brno, Czech Republic; e-mail: capek @ ivb. cz Author Cárdenas-Callirgos, Jorge Manuel ) &) Laboratorio de Invertebrados, Museo de Historia Natural, Facultad de Ciencias Biológicas, Universidad Ricardo Palma, Av. Benavides 54440, Lima 33, Peru; e-mail: jmcardenasc @ gmail. com Author Franco, Sebastian 1,4) &) &) &) &) &) Department of Biology and Wildlife Diseases, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences, Palackého tř. 1 / 3, CZ- 612 42 Brno, Czech Republic; e-mails: sychrao @ vfu. cz, filipkounek @ seznam. cz, papouseki @ vfu. cz, sebastianfranco. py @ gmail. com, literaki @ vfu. cz Author Literák, Ivan 1,4) &) &) &) &) &) Department of Biology and Wildlife Diseases, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences, Palackého tř. 1 / 3, CZ- 612 42 Brno, Czech Republic; e-mails: sychrao @ vfu. cz, filipkounek @ seznam. cz, papouseki @ vfu. cz, sebastianfranco. py @ gmail. com, literaki @ vfu. cz text Acta Entomologica Musei Nationalis Pragae 2014 2014-04-30 54 1 1 27 journal article 7790 10.5281/zenodo.4503818 0273e3ed-5dd5-4df5-b34e-23fa713fde28 0374-1036 4503818 DEAB8B06-2BCC-4654-9675-C5393A9AB689 Myrsidea myiobori Kounek & Sychra, 2011 ( Figs 2 C–D) Myrsidea myiobori Kounek & Sychra, 2011b: 58 , Figs 5 –8. Type host. Myioborus miniatus (Swainson, 1827) – Slate-throated redstart Material examined. 1 ♀ 1 3, ‘O.Sychra CR225 / Myrsidea myiobori / Kounek & Sychra, 2011 / det. O.Sychra // Troglodytes aedon intermedius / COSTA RICA / Tapanti National Park / Sector Tapanti / 11.viii.2009 / Literák & Sychra leg.’ Variability. Our specimens differ slightly from the description of M . myiobori in KOUNEK et al. (2011b) by setal counts and dimensions as follows [setal counts and dimensions in KOUNEK et al. (2011b) are in parentheses: setal counts and dimensions that are fully consistent with this description are not repeated here]: Female (n = 1). As in Fig. 2C . Length of DHS 11 , 0.100 –0.110 (0.110) ; ratio DHS 10 /11, 0.27–0.30 (0.27). First tibia with 3 (3) outer lateral ventral and 4 (4) dorsal setae (setal counts on legs are not mentioned in the description of M. myiobori , hence we added here the same numbers). Femur III with 14 (15–17) setae in ventral setal brush . Tergal setae counts: I, 9 (10); II , 15 (17); III , 19 (18); IV , 20 (18); V , 21 (19); VI , 18 (19); VII , 18 (15); VIII , 14 (11). Postspiracular setae very long, 0.46–0.48 (0.37–0.43) on II , IV and VIII ; long, 0.21–0.23 (0.16) on VII ; short, 0.15–0.18 (0.12–0.13) on III , V and VI . Postspiracular setae I are missing. Sternal setae: III , 24 (21); IV , 30 (32); V , 32 (35); VI , 31 (33); VIII–IX , 22 (21) including 13 (12) setae on deeply serrated vulval margin. Inner posterior seta of last tergum not longer than anal fringe setae with length 0.05–0.06 (0.04–0.05). Anal fringe formed by 41 (40) dorsal and 38 (37) ventral setae. Dimensions: TW, 0.44 (0.45); PW , 0.29 (0.28); MW , 0.44 (0.42); AW, 0.60 (0.54); ANW, 0.22 (0.24); TL, 1.50 (1.46). Male (n = 1). As in Fig. 2D . Length of DHS 10, 0.035 (0.030); ratio DHS 10/11, 0.35 (0.30). Metasternal plate with 7 (6) setae; metanotum with 9 (10) setae on posterior margin. Femur III with 12–14 (10–12) setae in ventral setal brush. Tergal setae counts: I, 8 (11); II , 16 (16–17); III , 15 (18); IV , 16 (17–18); V 17 (18) ; VI 17 (16–17) ; VII , 12 (14–15); VIII , 11 (11–12). Postspiracular seta I 0.20 long (0.22–0.24). Sternal setae: III , 21 (20); IV , 24 (23–24); V , 30 (27); VI , 28 (22–26); VII , 15 (18); VIII , 8 (7). Genital sac sclerite distorted, but it appears to be of the same type as that of M. myiobori , although the genital sac sclerite of the single paratype male of this species is also distorted ( KOUNEK et al. 2011b : Fig. 8) Dimensions: TW, 0.40 (0.39–0.40) ; AW, 0.44 (0.42–0.43); GW, 0.11 (0.10); GSL, 0.10 (0.07). Bionomics. Although CICCHINO (1980) mentioned Myrsidea sp. from T. aedon from Argentina , this is the first species determination of a Myrsidea from this host. This louse was originally described from Myioborus miniatus (Swainson, 1827) belonging to family Parulidae from Costa Rica ( KOUNEK et al. 2011b ). Our finding represents interesting case of natural host switching and another record of one species of Myrsidea from two unrelated host families.