Myrsidea klimesi, Sychra, Old Ì Ich, Literák, Ivan, Apek, Miroslav Č & Martin, 2006

Sychra, Old Ì Ich, Literák, Ivan, Apek, Miroslav Č & Martin, 2006, Chewing lice (Phthiraptera) from typical antbirds and ground antbirds (Passeriformes: Thamnophilidae, Formicariidae) from Costa Rica, with descriptions of three new species of the genera Formicaphagus and Myrsidea, Zootaxa 1206, pp. 47-61 : 55-57

Myrsidea klimesi , new species

( Figs. 10–11 , 14–15 )

Male (2). Head without lateral notch or slit; lateral sides of preantennal region convex; hypopharyngeal sclerites reduced. Mean length of head seta 10, only 0.020 (n=4); seta 11, 0.103 (n=4); ratio10/11, 0.19. Latero­ventral fringe with 8–10 setae; outer occipital setae as long as inner one; short fine seta 23 (according to Clay 1969) present and anterolateral to 22. Each side of temple margin with 1 long and 3 very long setae; gula with 3–5 setae on each side, posteriormost much heavier and longer than others. Pronotum with 6 long and 2 short posterior marginal setae, and only 1 short spiniform setae plus 1 finer seta on each lateral corner. Anterior margin of prosternal plate is straight with pair of minute anterior setae ( Fig. 11 ). Mesonotum with median division, with pair of minute setae adjacent to postnotum; segment ringed by sclerite, with large mesosternal plate. Metanotum not enlarged, with very long corner setae and 4 setae on posterior margin. Pleural margin of metathorax with 3 (rarely 4) short, stout setae; metasternal plate large, triangular, with 4–5 long setae on each side. First tibia with 3 outer lateral ventral and 4–5 dorsal setae; femur III with 12 setae in ventral setal brush. Tergal setae (including postspiracular setae and all setae between them): I, 8; II, 10–11; III, 14–15; IV–VII, 9–13; VIII, 8–9. Postspiracular setae extremely long on II–IV and VIII, long on I and VII, and shorter V–VI. Abdomen without anterior tergal or pleural setae; margin of pleurites I–IV with only short spiniform setae, pleurites V–VII also with 1–2 longer finer setae; margin of pleurite VIII with median long seta flanked on each side by shorter seta. Sternite I rounded posteriorly and situated inside wide notch of sternite II. Sternal setae on II, 10 medioanterior; 18–20 marginal, including cluster of 4 robust setae on each side. Marginal setae of sternite: III, 17, including another 1–2 robust setae on each side; IV–V, 19–20; VI, 17–18; VII, 12–14; VIII, 7–10; subgenital plate (only sternite IX), 10–13. Lateral anterior sternal setae: III, 0; IV, 2–4; V–VI, 3–6; VII, 1–3, with 2–5 medioanterior setae on IV–VII. Length of inner posterior seta of last tergum 0.021 (n=3); short lateral marginal seta of last segment 0.031 (n=3) Genitalia and distal end of genital sclerite as in Figs. 14 and 15 respectively. Dimensions: TW, 0.39–0.40; HL, 0.24–0.25; PW, 0.24; PSL, 0.10; MW, 0.29–0.31; MSL, 0.15; AWIV, 0.39–0.40; TL, 1.13–1.18; GL, 0.30–0.32; GW, 0.09–0.10; GPL, 0.07.

Female (4). As in Fig. 10 . Most features as in male. Mean length of head seta 10, 0.023 (n=7); seta 11, 0.110 (n=7); ratio10/11, 0.21. Setae of femoral brush, 13–15. Abdomen without conspicuously enlarged tergites; with tergal setae: I, 8–10; II–IV, 13–17; V–VII, 11–14; VIII, 8. Pleurites III–VI with one short spiniform anterior seta. Sternal setae on II, 8–11 medioanterior; 21–23 marginal, including cluster of 5–6 robust setae on each side. Marginal setae of sternite: III, 22; including another 3 robust setae on each side; IV, 21–23; V, 19–22; VI, 17–19; VII, 14–17; subgenital plate is forming by fusion of sternites VIII–IX with 12–14 marginal and 24–31 anterior setae. Lateral anterior sternal setae: III, 1; IV, 3–8; V–VI, 6–10; VII, 4–7; with 4–8 medioanterior setae on IV–VII. Posterior margin of subgenital plate is plain, not serrated. Anal fringe of 21–33 dorsal and 28–41 ventral setae. Mean length of inner posterior seta of last tergum 0.032 (n=6); short lateral marginal seta of last segment 0.042 (n=6). Dimensions: TW, 0.42–0.43; HL, 0.26– 0.27; PW, 0.25–0.27; PSL, 0.11; MW, 0.35–0.37; MSL, 0.17–0.18; AWIV, 0.49–0.52; TL, 1.35–1.46; ANW, 0.19–0.20.

Type material. Female holotype, male allotype, ex Formicarius analis , COSTA RICA: Hitoy Cerere BR, Provincia Limón (940’N, 8505’W), 27 and 31 August 2004, Literák, Č apek & Havlíček. Paratypes: 1 female and 1 male with same data as holotype. Deposited in INBIO—O. Sychra CR14–16.

Remarks. Both sexes of M. klimesi are readily identified by a unique combination of characters, as follows: (1) reduced hypopharynx; (2) head seta 10 very small and, consequently, a very small ratio of lengths of head setae 10/11; (3) presence of head seta 23, and outer occipital seta as long as the inner one; (4) pronotum with 6 long and 2 short posterior marginal setae, and only one short spiniform setae plus one finer seta on each lateral corner; (5) straight anterior margin of prosternal plate; (6) position of sternite I, which lies inside the wide notch of sternite II; (7) relative lengths of the postspiracular setae, especially the extremely long seta on abdominal tergite III; (8) presence of a cluster of robust setae on each side of sternite III, as well as on II; (9) presence of medioanterior setae on sternites IV–VII; (10) male abdominal sternite VIII and female sternite VII both separated from the subgenital plate, which is formed by a single sternite IX (in the male) or fusion of sternites VIII and IX (in the female); (11) female with one anterior pleural seta on pleurites III–VI; (12) posterior margin of female subgenital plate smooth (not serrated); (13) unique feature in the male genital sclerite ( Fig. 12 ). Two of four birds examined were parasitised by M. klimesi .

Etymology. This species is named in honour of Jiří Klimeš, our colleague and friend, in recognition of his friendship and unmatched enthusiasm in the study of zoology.

Figures

FIGURE 8 – 11. Myrsidea mcleannanii n. sp. 8 — female; 9 — prosternal plate; M. klimesi n. sp. 10 — female; 11 — prosternal plate. Scales 1 mm (Figs 8, 10), 0.10 mm (Figs 9, 11).

FIGURE 12 – 15. Myrsidea mcleannanii n. sp. 12 — male genitalia; 13 — male genitalia sclerite; M. klimesi n. sp. 14 — male genitalia; 15 — male genitalia sclerite. Scales 0.10 mm (Figs 12, 14), 0.05 mm (Figs 13, 15).