Myrsidea pyriglenae Kolencik & Sychra & Papousek & Kuabara & Valim & Literak 2018, new species

Myrsidea pyriglenae, new species (Figs 14–17, 27, 43–44) Type host. Pyriglena leucoptera (Vieillot, 1818) —white-shouldered fire-eye. Type locality. San Rafael National Park, Paraguay (26°30'S, 55°47'W). Type material. Ex Pyriglena leucoptera: holotype ♀, San Rafael National Park, Paraguay (26°30'S, 55°47'W), 21 August 2012, I. Literak (MMBC). Paratypes: 6♀, 7♂ with the same data as holotype (MMBC). Diagnosis. Myrsidea pyriglenae belongs to the mcleannani species group (sensu Price et al. 2008b), based on the shape of the male genital sac sclerite and the deeply serrated female vulvar margin. According to setal counts and measurements, it is morphologically similar to M. milleri Price, Johnson & Dalgleish, 2008 ex Gymnopithys rufigula (Boddaert, 1783) from Venezuela. However, females of M. pyriglenae n. sp. are distinguished from those of M. milleri by having (1) modified tergites, especially enlarged tergite II (Fig. 27), and (2) larger number of setae on tergite VII (14–16 vs 6–10), tergite VIII (8–9 vs 4), and on anal fringe (83–88 vs 64–74). Males of M. pyriglenae differ from those of M. milleri by having a larger number of setae on tergites VII (11–15 vs 7–9) and VIII (7–8 vs 4). In addition, the host species of these two species of Myrsidea (Pyriglena leucoptera and Gymnopithys rufigula) have different geographical distributions (Clements et al. 2017) and are not phylogenetically closely related (Isler et al. 2013). Considering genetic data, M. pyriglenae is closest to M. patersoni Price & Johnson, 2009 (see Remarks below), but these two species clearly differ in such significant characters as (1) female tergites having completely different shapes (compare Fig. 27 with fig. 3 in Price & Johnson 2009), and (2) completely different genital sac sclerite in males (compare Figs 14–17 with fig. 4 in Price & Johnson 2009). Description. Female (n = 4). As in Figs 27 and 43. Head with lateral sides of preantennal region conspicuously concave. Hypopharyngeal sclerites fully developed. Length of dhs 10, 0.050–0.064; dhs 11, 0.100– 0.113; ratio dhs 10/11, 0.44–0.63; ls5 0.04–0.05 long, latero-ventral fringe with 9–10 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 4 dorso-lateral setae. Metanotum not enlarged, with 4–7 marginal setae; metasternal plate with 6–7 setae; metapleurites with 3–4 short strong spiniform setae. Femur III with 14–16 setae in ventral setal brush. Tergites modified as on Fig. 27, with enlarged tergite II and widely convex posterior margin of tergites II and III. Abdominal segments with well-defined median gap in each row of tergal setae. Tergal setae: I, 5–8; II, 6– 8; III, 11–12; IV–V, 15–18; VI, 15–17; VII, 14–16; VIII, 8–9. Postspiracular setae very long on II, IV, VII and VIII (0.35–0.45); long on I (0.23); and short on III, V and VI (0.11–0.16). Inner posterior seta of last tergum not longer than anal fringe setae with length 0.07–0.09 inserted 0.060–0.075 from base of each very long seta; length of short lateral marginal seta of last segment, 0.03–0.04. Pleural setae: I, 6–8; II, 7–10; III, 7–9; IV, 8; V, 6–7; VI, 6; VII, 4– 5; VIII, 3. Pleurites V–VII with 1–2 somewhat slender and longer setae. Pleurite VIII with inner setae (0.06–0.08) as long as outer (0.05–0.06). Anterior margin of sternal plate II with a medial notch. Sternal setae: I, 0; II, 4–6 in each aster: s1, 0.08–0.10; s2, 0.08–0.09; s3, 0.07–0.08; s4, 0.05–0.06; s5, 0.04; with 14–16 marginal setae between asters, 4–7 medioanterior; III, 27–30; IV, 3 3–36; V, 32–39; VI, 28–36; VII, 23–25; VIII–IX, 15–18; and 9–13 setae on deeply serrated vulvar margin; sternites without medioanterior setae. Anal fringe formed by 38–43 dorsal and 42–46 ventral setae. Dimensions: TW, 0.46–0.48; POW, 0.35; HL, 0.28–0.34; PW, 0.29–0.30; MW, 0.44–0.48; AWIV, 0.61–0.66; ANW, 0.21–0.26; TL, 1.55–1.63. Male (n = 4). As in Fig. 44. Similar to female except as follows: length of dhs 10, 0.040–0.058; dhs 11, 0.089– 0.100; ratio dhs 10/11, 0.45–0.64; ls5 0.04 long, latero-ventral fringe with 9–10 setae. Gula with 5 (one specimen with 4 on one side) setae on each side. First tibia with 3 outer ventro-lateral and 4–5 dorso-lateral setae. Metanotum not enlarged with 4 marginal setae; metasternal plate with 5–6 setae; metapleurites with 3 short spiniform strong setae. Femur III with 11–13 setae in ventral setal brush. Abdominal segments with well-defined median gap in each row of tergal setae. Tergal setae: I, 6–8; II, 6–11; III, 14–15; IV, 13–16; V, 15–17; VI, 14–18; VII, 11–15; VIII, 7–8. Postspiracular setae same with the same pattern as in female but shorter. Length of inner posterior seta of last tergum, 0.04–0.06; short lateral marginal seta of last segment, 0.02. Pleural setae: I, 5–6; II, 6–7; III, 7–8; IV, 6–7; V, 5–7; VI, 5–6; VII, 4; VIII, 3. Pleurites IV–VII with 0–3 slender and longer setae. Pleurite VIII with inner setae (0.04–0.05) as long as outer (0.04–0.05). Anterior margin of sternal plate II with a medial notch. Sternal setae: I, 0; II, 4–5 in each aster: s1, 0.08–0.09; s2, 0.07–0.08; s3, 0.06; s4, 0.05–0.06; s5, 0.03; with 12–15 marginal setae between asters, 4–7 medioanterior; III, 1 9–27; IV, 25–29; V, 26–32; VI, 25–27; VII, 19–22; VIII, 7–11; remainder of plate, 8–11; and with 3–4 setae posteriorly; with 8–9 internal anal setae. Genital sac sclerite as in Figs 14–17. Dimensions: TW, 0.41–0.43; POW, 0.31–0.32; HL, 0.27–0.30; PW, 0.26–0.28; MW, 0.35–0.38; AWIV, 0.46–0.47; GW, 0.10–0.11; GSL, 0.08–0.09; TL, 1.25–1.33. Etymology. The species epithet is a noun in apposition derived from the generic name of the type host. Remarks. This is the first record of Myrsidea from Pyriglena leucoptera. A portion of COI gene was sequenced from specimens of M. pyriglenae from Paraguay (GenBank MF563533). Comparing our sequence with other known sequences of Neotropical Myrsidea, the divergences exceeded 18% in all cases, the closest being that of M. patersoni Price & Johnson, 2009 (ex Eucometis penicillata (Spix, 1825), family Thraupidae, GenBank GQ454448), with a p-distance of 18.2%. Unfortunately, there are no genetic sequences known from M. milleri, the species morphologically closest to M. pyriglenae. However, considering the combination of morphological differences with M. patersoni and M. milleri, and the large sequence divergence with M. patersoni, we are confident that M. pyriglenae is a new, separate species.