New species and additional data on the chewing louse genus Myrsidea (Phthiraptera: Menoponidae) from wild Neotropical Passeriformes (Aves) Author Kolencik, Stanislav Author Sychra, Oldrich Author Papousek, Ivo Author Kuabara, Kamila M. D. Author Valim, Michel P. Author Literak, Ivan text Zootaxa 2018 4418 5 401 431 journal article 30109 10.11646/zootaxa.4418.5.1 fe001114-35af-46d5-bab4-4ab21689cdc6 1175-5326 1244956 04FEA195-71DA-4C7E-A62B-A658CFCF6B0C Myrsidea philydori , new species ( Figs 3 , 8–10 , 20–21 ) Type host. Philydor rufum (Vieillot, 1818) —buff-fronted foliage-gleaner. Type locality. San Rafael National Park , Paraguay ( 26°30'S , 55°47'W ). Type material. Ex Philydor rufum : holotype ♀ , San Rafael National Park , Paraguay ( 26°30'S , 55°47'W ), 19 August 2012 , I. Literak ( MMBC ) . Paratypes : 2♀ , 3♂ , with the same data as holotype . Other material, non-type. Ex Anabacerthia lichtensteini (Cabanis & Heine, 1859) —ochre-breasted foliagegleaner: 1♂ , San Rafael National Park , Paraguay ( 26°30'S , 55°47'W ), 20 August 2012 , I. Literak ( MMBC ). Diagnosis. Myrsidea philydori n. sp. shares the same type of male genital sac sclerite as other Myrsidea from members of the Furnariidae . According to the shape of female tergites, M. philydori is close to M. waterstoni Valim, Price & Johnson, 2011 from Anabacerthia variegaticeps (P.L. Sclater, 1857) from Panamá . Female of M. philydori can be easily distinguished from those of M. waterstoni by the absence of a detached plate on tergite III and a larger number of setae on tergites IV–VI (12–14 vs 7–10 respectively). Males of M. philydori and of M. waterstoni are very similar in setal counts, but they can be separated by smaller dimensions in all measurements, especially TW (0.42–0.44 vs 0.47) and PW (0.26–0.28 vs 0.31). Comparing M. philydori with other Neotropical Myrsidea , the new species has modified tergites similar to those of M. rekasii Dalgleish & Price, 2003 and M. baileyae Dalgleish & Price, 2003 , both described from the Pipridae . However, males of these latter species have completely different type of genital sac sclerite. Females of M. philydori differ from those of M. rekasii by smaller numbers of setae on tergites I–III (9–10 vs 12–14 on I; 6–8 vs 11–18 on II; 10–11 vs 13–16 on III) and from those of M. baileyae by smaller number of setae on tergite VIII (4 vs 8–9), as well as by smaller dimensions, especially TW (0.47–0.48 vs 0.54–0.55). Description. Female (n = 3). As in Figs 3 and 20 . Hypopharyngeal sclerites fully developed. Length of dhs 10, 0.051–0.055; dhs 11, 0.098–0.111; ratio dhs 10/11, 0.46–0.55; ls5 0.04 long, latero-ventral fringe with 10–11 setae. Gula with 4 setae on each side. Pronotum with 6 setae on posterior margin and 3 short spiniform setae at each lateral corner. First tibia with 3 outer ventro-lateral and 4–5 dorso-lateral setae. Metanotum not enlarged, with 8–11 marginal setae; metasternal plate with 4 setae; metapleurites with 4 short strong spiniform setae. Femur III with 13–15 setae in ventral setal brush. Tergites modified as follows: I–II strongly convex, III–IV are depressed by I–II ( Fig. 3 ). Abdominal segments with well-defined median gap in each row of tergal setae. Tergal setae: I, 9–10; II, 6– 8; III, 10–11; IV, 12–13; V, 12–14; VI, 12–14; VII, 7–8; VIII, 4; Postspiracular setae very long on II, IV, VII and VIII (0.35–0.46); long on I and III (0.23–0.32); and short on V and VI (0.13–0.20). Inner posterior seta of last tergum not longer than anal fringe setae with length 0.03–0.06; length of short lateral marginal seta of last segment, 0.03–0.06. Pleural setae: I, 6–7; II, 7–8; III, 7–8; IV, 6–7; V, 5–6; VI, 5–6; VII, 3–4; VIII, 3. Pleurites without slender and longer setae. Pleurite VIII with inner setae (0.02–0.04) as long as outer (0.02–0.04). Anterior margin of sternal plate II with a medial notch. Sternal setae: I, 0; II, 5 in each aster: s1 , 0.10–0.12; s2 , 0.09–0.10; s3 , 0.07– 0.08; s4 , 0.05–0.06; s5 , 0.04–0.05; with 13–14 marginal setae between asters, 6 medioanterior; III, 20–23; IV, 29– 34; V, 31–37; VI, 25–28; VII, 12–15; VIII–IX, 11–12; and 11–13 setae on deeply serrated vulvar margin; sternites III–VII without medioanterior setae. Anal fringe formed by 38–40 dorsal and 33–43 ventral setae. Dimensions: TW, 0.47–0.48; POW, 0.36–0.37; HL, 0.32–0.33; PW, 0.29; MW, 0.46–0.48; AWIV, 0.60; ANW, 0.20–0.25; TL, 1.47–1.55. Male (n = 4). As in Fig. 21 . Similar to female except as follows: length of dhs 10, 0.048–0.054; dhs 11, 0.092– 0.100; ratio dhs 10/11, 0.48–0.59; ls5 0.03 long, latero-ventral fringe with 10–11 setae. Gula with 3–4 setae on each side. Metanotum not enlarged with 4–7 marginal setae; metasternal plate with 4 ( 6 in specimen from A. lichtensteini ) setae; metapleurites with 3–4 short spiniform strong setae. Femur III with 10–14 setae in ventral setal brush. Abdominal segments with well-defined median gap in each row of tergal setae. Tergal setae: I, 7–9; II, 8–11; III–IV, 9–11; V, 11–12; VI, 9–11; VII, 4–6; VIII, 4; Postspiracular setae with the same pattern as in female but shorter. Length of inner posterior seta of last tergum, 0.05; short lateral marginal seta of last segment, 0.02. Pleural setae: I, 5–6; II, 6–7; III, 6–7; IV, 6; V, 5; VI, 4–5; VII, 3; VIII, 3. Pleurite VIII with inner setae (0.03–0.04) as long as outer (0.02–0.03). Anterior margin of sternal plate II with a medial notch. Sternal setae: I, 0; II, 4–5 in each aster: s1 , 0.09–0.12; s2 , 0.07–0.10; s3 , 0.06–0.07; s4 , 0.04–0.05; s5 , 0.02–0.04; with 12–14 marginal setae between asters, 4–6 medioanterior; III, 16–23; IV, 24–28; V, 22–33; VI, 20–26; VII, 10–14; VIII, 4; remainder of plate, 8– 10; and with 3–4 setae posteriorly; sternites III–VII without medioanterior setae. With 8 internal anal setae. Genital sac sclerite as in Figs 8–10 . Dimensions: TW, 0.42–0.44; POW, 0.33–0.35; HL, 0.31; PW, 0.26–0.28; MW, 0.37– 0.39; AWIV, 0.47–0.48; GW, 0.11–0.12; GSL, 0.08; TL, 1.23–1.33. Etymology. The species epithet is a noun in apposition derived from the generic name of the type host. Remarks. These are first records of chewing lice from both Philydor rufum and Anabacerthia lichtensteini . A portion of COI gene was sequenced from one specimen of M . philydori from Anabacerthia lichtensteini from Paraguay (GenBank MF563530 ). Comparing our sequence with other known sequences of Neotropical Myrsidea , divergences exceeded 19% in all cases, including that with M. waterstoni (ex Anabacerthia variegaticeps , family Furnariidae, GenBank FJ 171278 ) being 19.3%. Curiously, comparing our sequence of M . philydori with all known Myrsidea sequences, the closest was that of M . textoris Klockenhoff, 1984 (ex Ploceus intermedius Rüppell, 1845 and Ploceus velatus Vieillot, 1819 , family Ploceidae, GenBank KF768813 and KF768815 ) from South Africa , with a p-distance of about 17.5%. Furthermore, sequences of a portion of EF-1alpha gene of M . philydori from Philydor rufum and from Anabacerthia lichtensteini (GenBank MF574203 – MF574204 ) were identical to each other, and diverged from that of M. waterstoni (GenBank FJ171305 ) by 3.4%. All these sequence divergences are large enough to confirm M. philydori as a new, separate species.