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 myiobori Kounek & Sychra sp. nov. ( Figs. 5–8 ) Type host: Myioborus miniatus (Swainson) —Slate-throated redstart Female (n = 1) . Hypopharyngeal sclerites slightly reduced ( Fig. 5 ). Length of head seta 10, 0.030; seta 11, 0.110; ratio10/11, 0.27. Gula with 5 setae on each side. Metasternal plate with 6 setae, metanotum not enlarged, with 11 marginal setae. Abdomen with tergite I slightly enlarged, tergites II and III with a pronounced medioposterior convexity, IV and V with a medioposterior enlargement, but with an almost straight posterior margin in the middle ( Fig. 6 ). Tergal setae with wide median gap in each row, and setal numbers as follows: tergite I, 10; II, 17; III–IV, 18; V–VI, 19; VII, 15; VIII, 11. Postspiracular setae: extremely long (0.37–0.43) on II, IV and VIII; very long (0.25–0.27) on I; and conspicously shorter (0.12–0.16) on III and V–VII. Sternal setae: II, 4 in each aster, 16 marginal between asters, 6 anterior; III, 21; IV, 32; V, 35; VI, 33; VII, 18; VIII–IX, 21 including 12 setae on deeply serrated vulval margin; without medioanterior sternal setae. Inner posterior seta of last tergum not longer than anal fringe setae with length 0.04–0.05; length of short lateral marginal seta of last tergum, 0.05. Dimensions: TW, 0.45; HL, 0.29; PW, 0.28; MW, 0.42; AW, 0.54; TL, 1.46; ANW, 0.24. Male (n = 2) . Length of head seta 10, 0.030; seta 11, 0.100; ratio10/11, 0.30. Gula with 5 setae on each side. Metasternal plate with 6 setae, metanotum with 10 marginal setae. Tergal setal counts: I, 11; II, 16–17; III, 18; IV, 17–18; V, 18; VI, 16–17; VII, 14–15; VIII, 11–12. Postspiracular setae: extremely long (0.40–0.42) on II, IV and VIII; very long (0.22–0.24) on I; and conspicously shorter (0.10–0.18) on III and V–VII. Sternal setae: II, aster 4, 13–14 marginal between asters, 4–7 anterior ( Fig. 7 ); III, 20; IV, 23–24; V, 27; VI, 22–26; VII, 18; VIII, 7; without medioanterior sternal setae. Genital sac sclerite distorted, but probably of the same type as those of other three described species (see Fig. 8 vs. Fig. 15 ). Dimensions: TW, 0.39–0.40; HL, 0.27; PW, 0.26–0.27; MW, 0.33–0.35; AW, 0.42–0.43; TL, 1.10–1.20; GW, 0.10; GSL, 0.07. Type material. Female holotype and paratype male (O. Sychra CR175) ex Myioborus miniatus (Swainson) , COSTA RICA : Tapanti National Park, Sector Tapanti ( 09°46’N , 83°47’W ; 1200 m ), 11 August 2009 , Sychra and Literak leg. Deposited in INBio ; 1 paratype male (O. Sychra CR182) with the same data deposited in MZM. Remarks. This is the first record of chewing lice from Myioborus miniatus . Myrsidea myiobori differs from all parulid Myrsidea by pronounced medioposterior convexity on tergites II–III of female and male with tergite VIII with at least 10 setae. Myrsidea myiobori is also well defined by the following characteristics: (1) slightly reduced hypopharyngeal sclerites; (2) well-developed median gap in all rows of tergal setae; (3) metanotum not enlarged with slightly convex posterior margin; (4) postspiracular setae on VII conspicuously shorter than those on I, similar to those on III, V and VI; (5) unique shape of female abdominal tergites I to V. Etymology. The specific name derives from the generic name of the type host.