Myrsidea philydori

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: 410-411

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Myrsidea philydori

new species

Myrsidea philydori  , new species

( Figs 3View FIGURES 2–3, 8–10View FIGURES6–17, 20–21View FIGURES 18–21)

Type host. Philydor rufum (Vieillot, 1818)  —buff-fronted foliage-gleaner.

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

Type material. Ex Philydor rufum  : holotype ♀, San Rafael National Park, Paraguay (26°30'S, 55°47'W), 19 August 2012, I. Literak ( MMBC)GoogleMaps  . Paratypes: 2♀, 3♂, with the same data as holotypeGoogleMaps  .

Other material, non-type. Ex Anabacerthia lichtensteini (Cabanis & Heine, 1859)  —ochre-breasted foliagegleaner: 1♂, San Rafael National Park, Paraguay (26°30'S, 55°47'W), 20 August 2012, I. Literak ( MMBC).GoogleMaps 

Diagnosis. Myrsidea philydori  n. sp. shares the same type of male genital sac sclerite as other Myrsidea  from members of the Furnariidae  . According to the shape of female tergites, M. philydori  is close to M. waterstoni Valim, Price & Johnson, 2011  from Anabacerthia variegaticeps (P.L. Sclater, 1857)  from Panamá. Female of M. philydori  can be easily distinguished from those of M. waterstoni  by the absence of a detached plate on tergite III and a larger number of setae on tergites IV –VI (12–14 vs 7–10 respectively). Males of M. philydori  and of M. waterstoni  are very similar in setal counts, but they can be separated by smaller dimensions in all measurements, especially TW (0.42–0.44 vs 0.47) and PW (0.26–0.28 vs 0.31). Comparing M. philydori  with other Neotropical Myrsidea  , the new species has modified tergites similar to those of M. rekasii Dalgleish & Price, 2003  and M. baileyae Dalgleish & Price, 2003  , both described from the Pipridae  . However, males of these latter species have completely different type of genital sac sclerite. Females of M. philydori  differ from those of M. rekasii  by smaller numbers of setae on tergites I –III (9–10 vs 12–14 on I; 6–8 vs 11–18 on II; 10–11 vs 13–16 on III) and from those of M. baileyae  by smaller number of setae on tergite VIII (4 vs 8–9), as well as by smaller dimensions, especially TW (0.47–0.48 vs 0.54–0.55).

Description. Female (n = 3). As in Figs 3View FIGURES 2–3 and 20View FIGURES 18–21. Hypopharyngeal sclerites fully developed. Length of dhs 10, 0.051–0.055; dhs 11, 0.098–0.111; ratio dhs 10/11, 0.46–0.55; ls5 0.04 long, latero-ventral fringe with 10–11 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 4–5 dorso-lateral setae. Metanotum not enlarged, with 8–11 marginal setae; metasternal plate with 4 setae; metapleurites with 4 short strong spiniform setae. Femur III with 13–15 setae in ventral setal brush. Tergites modified as follows: I –II strongly convex, III –IV are depressed by I –II ( Fig. 3View FIGURES 2–3). Abdominal segments with well-defined median gap in each row of tergal setae. Tergal setae: I, 9–10; II, 6– 8; III, 10–11; IV, 12–13; V, 12–14; VI, 12–14; VII, 7–8; VIII, 4; Postspiracular setae very long on II, IV, VII and VIII (0.35–0.46); long on I and III (0.23–0.32); and short on V and VI (0.13–0.20). Inner posterior seta of last tergum not longer than anal fringe setae with length 0.03–0.06; length of short lateral marginal seta of last segment, 0.03–0.06. Pleural setae: I, 6–7; II, 7–8; III, 7–8; IV, 6–7; V, 5–6; VI, 5–6; VII, 3–4; VIII, 3. Pleurites without slender and longer setae. Pleurite VIII with inner setae (0.02–0.04) as long as outer (0.02–0.04). Anterior margin of sternal plate II with a medial notch. Sternal setae: I, 0; II, 5 in each aster: s1, 0.10–0.12; s2, 0.09–0.10; s3, 0.07– 0.08; s4, 0.05–0.06; s5, 0.04–0.05; with 13–14 marginal setae between asters, 6 medioanterior; III, 20–23; IV, 29– 34; V, 31–37; VI, 25–28; VII, 12–15; VIII –IX, 11–12; and 11–13 setae on deeply serrated vulvar margin; sternites III –VII without medioanterior setae. Anal fringe formed by 38–40 dorsal and 33–43 ventral setae. Dimensions: TW, 0.47–0.48; POW, 0.36–0.37; HL, 0.32–0.33; PW, 0.29; MW, 0.46–0.48; AWIV, 0.60; ANW, 0.20–0.25; TL, 1.47–1.55.

Male (n = 4). As in Fig. 21View FIGURES 18–21. Similar to female except as follows: length of dhs 10, 0.048–0.054; dhs 11, 0.092– 0.100; ratio dhs 10/11, 0.48–0.59; ls5 0.03 long, latero-ventral fringe with 10–11 setae. Gula with 3–4 setae on each side. Metanotum not enlarged with 4–7 marginal setae; metasternal plate with 4 (6 in specimen from A. lichtensteini  ) setae; metapleurites with 3–4 short spiniform strong setae. Femur III with 10–14 setae in ventral setal brush. Abdominal segments with well-defined median gap in each row of tergal setae. Tergal setae: I, 7–9; II, 8–11; III –IV, 9–11; V, 11–12; VI, 9–11; VII, 4–6; VIII, 4; Postspiracular setae with the same pattern as in female but shorter. Length of inner posterior seta of last tergum, 0.05; short lateral marginal seta of last segment, 0.02. Pleural setae: I, 5–6; II, 6–7; III, 6–7; IV, 6; V, 5; VI, 4–5; VII, 3; VIII, 3. Pleurite VIII with inner setae (0.03–0.04) as long as outer (0.02–0.03). Anterior margin of sternal plate II with a medial notch. Sternal setae: I, 0; II, 4–5 in each aster: s1, 0.09–0.12; s2, 0.07–0.10; s3, 0.06–0.07; s4, 0.04–0.05; s5, 0.02–0.04; with 12–14 marginal setae between asters, 4–6 medioanterior; III, 16–23; IV, 24–28; V, 22–33; VI, 20–26; VII, 10–14; VIII, 4; remainder of plate, 8– 10; and with 3–4 setae posteriorly; sternites III –VII without medioanterior setae. With 8 internal anal setae. Genital sac sclerite as in Figs 8–10View FIGURES6–17. Dimensions: TW, 0.42–0.44; POW, 0.33–0.35; HL, 0.31; PW, 0.26–0.28; MW, 0.37– 0.39; AWIV, 0.47–0.48; GW, 0.11–0.12; GSL, 0.08; TL, 1.23–1.33.

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

Remarks. These are first records of chewing lice from both Philydor rufum  and Anabacerthia lichtensteini  . A portion of COI gene was sequenced from one specimen of M. philydori  from Anabacerthia lichtensteini  from Paraguay (GenBank MF563530View Materials). Comparing our sequence with other known sequences of Neotropical Myrsidea  , divergences exceeded 19% in all cases, including that with M. waterstoni  (ex Anabacerthia variegaticeps  , family Furnariidae, GenBank  FJ 171278View Materials) being 19.3%. Curiously, comparing our sequence of M. philydori  with all known Myrsidea  sequences, the closest was that of M. textoris Klockenhoff, 1984  (ex Ploceus intermedius Rüppell, 1845  and Ploceus velatus Vieillot, 1819  , family Ploceidae, GenBank  KF768813View Materials and KF768815View Materials) from South Africa, with a p-distance of about 17.5%. Furthermore, sequences of a portion of EF-1alpha gene of M. philydori  from Philydor rufum  and from Anabacerthia lichtensteini  (GenBank MF574203View Materials MF574204View Materials) were identical to each other, and diverged from that of M. waterstoni  (GenBank FJ171305View Materials) by 3.4%. All these sequence divergences are large enough to confirm M. philydori  as a new, separate species.


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