Chewing lice of the genus Myrsidea (Phthiraptera: Menoponidae) from New World warblers (Passeriformes: Parulidae) from Costa Rica, with descriptions of four new species Author Kounek, Filip Author Sychra, Oldrich Author Capek, Miroslav Author Literak, Ivan text Zootaxa 2011 3137 56 63 journal article 45736 10.5281/zenodo.205057 33d95712-880e-4ad3-a42f-eb2fe3b3f09a 1175-5326 205057 Myrsidea paleno Kounek & Sychra sp. nov. ( Figs. 9–11 ) Type host: Parkesia motacilla (Vieillot) —Louisiana waterthrush. Female (n = 2) . Hypopharyngeal sclerites well developed, as in Fig. 1 . Length of head seta 10, 0.060; seta 11, 0.100–0.110; ratio10/11, 0.55–0.60. Gula with 4–5 setae on each side. Metasternal plate with 7–8 setae, metanotum not enlarged, with 10–11 marginal setae. Abdomen with tergites I–II with slightly convex posterior margins ( Fig. 9 ); tergites with median gap in each setal row and setal numbers as follows: I, 13–15; II, 16–18; III, 16–17; IV, 16–17; V, 16; VI, 11–13; VII, 8; VIII, 8. Postspiracular setae: extremely long (0.40–0.42) on II, IV and VIII; very long (0.25–0.30) on I and VII; long (0.20– 0.23) on VI; and shorter (0.16–0.18) on III and V. Sternal setae: II, 4 in each aster, 13 marginal between asters, 4 anterior; III, 21–23; IV, 28; V, 29–32; VI, 24–25; VII, 10; VIII–IX, 21–22 including 9–10 setae on deeply serrated vulval margin; without medioanterior sternal setae. Inner posterior seta of last tergum quite long extending beyond ends of anal fringe setae ( Fig. 9 ) with length 0.09–0.10; length of short lateral marginal seta of last tergum, 0.03– 0.04. Dimensions: TW, 0.43; HL, 0.23–0.30; PW, 0.26; MW, 0.40–0.41; AW, 0.53; TL, 1.37–1.40; ANW, 0.19. Male (n = 1) . Length of head seta 10, 0.060; seta 11, 0.100–0.110; ratio10/11, 0.55–0.60. Gula with 4–5 setae on each side. Metasternal plate with 6 setae, metanotum with 9 marginal setae. Tergal setal counts: I, 8; II, 14; III, 15; IV, 12; V, 13; VI, 10; VII, 9; VIII, 8. Postspiracular setae: extremely long (0.40–0.44) on II, IV and VIII; long (0.21–0.24) on I and VII; somewhat shorter (0.16–0.19) on VI; and conspicously shorter (0.11–0.13) on III and V. Sternal setae: II, 4 in each aster, 11 marginal between asters, 4 anterior ( Fig. 10 ); III, 17; IV, 24; V, 29; VI, 25; VII, 12; VIII, 5; without medioanterior sternal setae. Genital sac sclerite with slight apical indentation, distinct subapical lateral projection on each side and with dark medioposterior line ( Fig. 11 ). Dimensions: TW, 0.38; HL, 0.26; PW, 0.23; MW, 0.31; AW, 0.53; TL, 1.18; GW, 0.10; GSL, 0.08. Type material. Female holotype (O. Sychra CR176) ex Parkesia motacilla (Vieillot) , COSTA RICA : Barbilla NP, ( 9°59’N , 85°27’W ; 600 m ), 4 September 2004 , Literak leg. Paratypes : 1 female (O. Sychra CR176) with same data as holotype ; and 1 male (O. Sychra CR177) ex Parkesia motacilla , COSTA RICA : Zona Protectora Las Tablas, La Amistad Lodge ( 8°54’N , 82°47’W ; 1300 m ), 20 August 2010 , Sychra and Literak leg. Deposited in INBio . Remarks. This is the first record of chewing lice of the genus Myrsidea from Parkesia motacilla . In general, M. paleno is similar to M. basileuteri . It can be separated by: (1) abdominal tergites I–II of female with slightly convex posterior margin; (2) higher number of setae on tergites (for example tergite VI of both sexes, 10–13 vs. 8); (3) inner posterior seta of the female last tergum long, extending beyond the end of the anal fringe setae; (4) larger dimensions (for example TW of female 0.43 vs. 0.41). Etymology. The specific name derives from the salutation or exclamation of one of our colleagues that accompanied us during our stay in Costa Rica in 2010, and which we adopted as our good luck charm.