Myrsidea leptopogoni, Kolencik & Sychra & Papousek & Kuabara & Valim & Literak, 2018

Kolencik, Stanislav, Sychra, Oldrich, Papousek, Ivo, Kuabara, Kamila M. D., Valim, Michel P. & Literak, Ivan, 2018, New species and additional data on the chewing louse genus Myrsidea (Phthiraptera: Menoponidae) from wild Neotropical Passeriformes (Aves), Zootaxa 4418 (5), pp. 401-431 : 427

Myrsidea leptopogoni , new species

( Figs 29 , 38–39 , 47–48 )

Type host. Leptopogon superciliaris Tschudi, 1844 —slaty-capped flycatcher.

Type locality. San Rafael National Park , Paraguay (26°30'S, 55°47'W).

Type material. Ex Leptopogon superciliaris : holotype ♀, Tapantí National Park, Sector Tapantí, Costa Rica (09°46'N, 83°47'W), 8 August 2009, O. Sychra & I. Literak ( MMBC).

Paratypes: 2♂ with the same data as holotype ( MMBC).

Diagnosis. Myrsidea leptopogoni n. sp. is morphologically close to M. rekasii Dalgleish & Price, 2003 —from species of Pipridae—in setal counts and the shape of tergites, but both sexes of M. leptopogoni have larger dimensions. Furthermore, the female of M. leptopogoni can also be distinguished by the absence of a median gap among setae on tergite I ( Fig. 29 ), and the male by the number of setae on tergites I–III (total 35–36 vs 19–28 in M. rekasii ). Among the species of Myrsidea from members of the Tyrannidae , the closest morphological species to M. leptopogoni is M. oleaginei , but females can be easily distinguished by the shape of tergites I–II, being U-shaped in M. leptopogoni ( Fig. 29 ), but V-shaped in M. oleaginei .

Description. Female (n = 1). As in Figs 29 and 47 . Hypopharyngeal sclerites fully developed. Length of dhs 10, 0.035; dhs 11, 0.098; ratio dhs 10/11, 0.36; ls5 0.04 long, latero-ventral fringe with 10 setae. Gula with 4–5 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 3 dorso-lateral setae. Metanotum not enlarged, with 10 marginal setae; metasternal plate with 6 setae; metapleurites with 4 short strong spiniform setae. Femur III with 14–15 setae in ventral setal brush. Tergites modified as on Fig. 29 . Tergite I enlarged, compressing II–IV at midline. Abdominal segments with constant row of tergal setae on tergite I and with well-defined median gap on tergites II–VIII. Tergal setae: I, 14; II, 17; III, 13; IV, 10; V, 11; VI, 10; VII, 7; VIII, 4. Postspiracular setae very long on II, IV and VIII (0.44–0.48); long on I and VII (0.29–0.33); and short on III, V and VI (0.13–0.16). Inner posterior seta of last tergum not longer than anal fringe setae with length 0.07; length of short lateral marginal seta of last segment, 0.03–0.05. Pleural setae: I, 6; II, 9; III, 8; IV, 7–8; V, 7; VI, 6; VII, 5; VIII, 3. Pleurites with only short spine-like setae. Pleurite VIII with inner setae (0.07) longer as outer (0.05). Anterior margin of sternal plate II with a medial notch. Sternal setae: I, 0; II, 4 in each aster: s1, 0.10; s2, 0.06; s3, 0.05; s4, 0.04; with 17 marginal setae between asters, 5 medioanterior; III, 22; IV, 30; V, 32; VI, 29; VII, 15; VIII–IX, 9; and 12 setae on deeply serrated vulvar margin. Anal fringe formed by 32 dorsal and 32 ventral setae. Dimensions: TW, 0.45; POW, 0.35; HL, 0.27; PW, 0.27; MW, 0.42; AWIV, 0.55; ANW, 0.22; TL, 1.45.

Male (n = 2). As in Fig. 48 . Similar to female except as follows: length of dhs 10, 0.022–0.035; dhs 11, 0.091– 0.095; ratio dhs 10/11, 0.24–0.37; ls5 0.02–0.04 long, latero-ventral fringe with 9 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 3–4 dorso-lateral setae. Metanotum not enlarged with 7–8 marginal setae; metasternal plate with 6 setae; metapleurites with 3 short spiniform strong setae. Femur III with 12 setae in ventral setal brush. Abdominal segments with well-defined median gap in each row of tergal setae. Tergal setae: I, 10; II, 13; III, 12– 13; IV, 11–13; V, 9–11; VI, 10; VII, 6–9; VIII, 4–6. Length of inner posterior seta of last tergum, 0.05–0.06; short lateral marginal seta of last segment, 0.02. Pleural setae: I, 5; II, 5–6; III, 6–7; IV, 6; V, 6; VI, 6; VII, 4–5; VIII, 3. Pleurites with only short spine-like setae. Pleurite VIII with inner setae (0.05) as long as outer (0.03). Anterior margin of sternal plate II with a medial notch. Sternal setae: I, 0; II, 4 in each aster: s1, 0.08–0.10; s2, 0.05–0,08; s3, 0.04–0.06; s4, 0.03–0.05; with 14 marginal setae between asters, 4–6 medioanterior; III, 1 9–20; IV, 23–25; V, 27–29; VI, 23–24; VII, 15–16; VIII, 5–6; remainder of plate, 7; and with 3 setae posteriorly. With 8 internal anal setae. Genital sac sclerite as in Figs 38–39 . Dimensions: TW, 0.40; POW, 0.31–0.32; HL, 0.25; PW, 0.25; MW, 0.34; AWIV, 0.44; GW, 0.11; GSL, 0.10; TL, 1.16–1.23.

Etymology. This species epithet is a noun in apposition derived from the generic name of the type host.

Remarks. This is the first record of chewing lice from Leptopogon superciliaris . A portion of COI gene was sequenced from specimens of M. leptopogoni from Costa Rica (GenBank MF563538 ). Comparing our sequence with other known sequences of Neotropical Myrsidea , the divergences exceeded 18% in all cases, including that with the morphologically close species M. oleaginei (ex Mionectes oleagineus , family Tyrannidae, GenBank KF048108 ), with a p-distance of 25.6%. The closest p-distance was with that of M. cnemotriccola (ex Cnemotriccus fuscatus , family Tyrannidae, GenBank KF048124 ), with a value of 18.1%. Unfortunately, there are no genetic sequences known from M. rekasii , the species morphologically closest to M. leptopogoni . However, considering the combination of morphological differences between M. oleaginei and M. rekasii , and the large sequence divergence with M. oleaginei , we are confident that M. leptopogoni is a new, separate species.

Figures

FIGURES 28–29. Dorso-ventral views of female thorax and abdomen: 28, Myrsidea pachyramphi n. sp.; 29, Myrsidea leptopogoni n. sp.

FIGURES 30–40. Male genital sac sclerites: 30–34, Myrsidea capeki n. sp.; 35, Myrsidea pachyramphi n. sp.; 36, Myrsidea contopi from Leptopogon amaurocephalus from Perú; 37, same but from Paraguay; 38–39, Myrsidea leptopogoni n. sp.; 40, Myrsidea pitangi from Pitangus sulphuratusfrom Paraguay.

FIGURES 45–48. Myrsidea pachyramphi n. sp.: 45, holotype female; 46, paratype male; Myrsidea leptopogoni n. sp.: 47, holotype female; 48, paratype male.