Myrsidea, Waterston, 1915

Sychra, Oldřich, Kounek, Filip, Papoušek, Ivo, Ćapek, Miroslav, Cárdenas-Callirgos, Jorge Manuel, Franco, Sebastian & Literák, Ivan, 2014, Chewing lice (Phthiraptera: Amblycera et Ischnocera) from wrens (Passeriformes: Troglodytidae), with description of a new species of Myrsidea, Acta Entomologica Musei Nationalis Pragae 54 (1), pp. 1-27 : 17-18

Key to the species of Myrsidea parasitic on Neotropical wrens

1. Hypopharyngeal sclerites weakly developed ( Fig. 1B ). ................................................ 2

– Hypopharyngeal sclerites well-developed or only slightly reduced. ............................. 4

2. Postspiracular seta VI at least 0.35 long. Female: TW at least 0.51, tergites VI–VII together with at least 39 setae, sternites IV–V together with at least 99 setae. Male: TW at least 0.46, tergite VIII with only 8 setae, sternite IV with at least 40 setae. ............................. .................................................. Myrsidea whitemani Price, Johnson & Dalgleish, 2008

– Postspiracular seta VI less than 0.26 long. Female: TW less than 0.49, tergites VI–VII together with less than 36 setae, sternites IV–V together with less than 84 setae. Male: TW less than 0.45, tergite VIII with at least 10 setae, sternite IV with less than 36 setae. ......................................................................................................................................... 3

3. Ratio DHS 10/11 less than 0.50, sternite VII with 29 setae. Female: tergites III–IV with straight posterior margin, tergites III–IV together with at least 41 setae. Male: TW 0.41, tergite V with at least 22 setae. ................ Myrsidea faccioae Valim & Weckstein, 2013

– Ratio DHS 10/11 at least 0.70, sternite VII with less than 20 setae. Female: tergites III–IV with slightly convex medioposterior margin ( Fig. 1C ), tergites III–IV together with less than 37 setae. Male: TW at least 0.43, tergite V with less than 20 setae. ......................... .................................................................. Myrsidea fasciata Sychra & Kounek sp. nov.

4. Tergites VII–VIII together with less than 18 setae; female with tergite I enlarged, medioposteriorly convex. ......................... Myrsidea bessae Price, Johnson & Dalgleish, 2008

– Tergites VII–VIII together with at least 25 setae; female tergites different. .................. 5

5. Male: TW less than 0.40, postspiracular seta VII short, as long as V and VI (less than 0.18). Female with tergites II and III with a pronounced medioposterior convexity. ....... .................................................................... Myrsidea myiobori Kounek & Sychra, 2011

– Male: TW 0.43, postspiracular seta VII extremely long, as long as VIII (at least 0.40). Female unknown. ................... Myrsidea vincesmithi Price, Johnson & Dalgleish, 2008

Figures

Fig. 1. Myrsidea fasciata Sychra & Kounek, sp. nov.: A – dorso-ventral view of female; B – hypopharyngeal sclerites; C – dorsal view of tergites I–V of female; D – male genital sac sclerite. Scales: A, C = 0.50 mm; D = 0.10 mm; B = 0.05 mm.