Myrsidea ramoni Soto Madrid & Sychra, 2020

Ramon, Madrid, Soto, Old, Sychra, rich, Benedick, Suzan, Edwards, David P., Efeykin, Boris D., Fandrem, Marte, Haugaasen, Torbjørn, Teterina, Anastasia, Tomassi, Suzanne & Tolstenkov, Oleg, 2020, Diversity and host associations of Myrsidea chewing lice (Phthiraptera: Menoponidae) in the tropical rainforest of Malaysian Borneo, International Journal for Parasitology: Parasites and Wildlife 13, pp. 231-247 : 238-240

3.1.10. Myrsidea ramoni Soto Madrid & Sychra , new species

( Fig. 4A–E , 7A–B ).

Type host. Copsychus malabaricus stricklandii ( Motley and Dillwyn, 1855) – White-crowned Shama ( Muscicapidae ).

Type locality. YSFMA in Sabah, MALAYSIA (4 ◦ 58 ′ N, 117 ◦ 4 ′ E) .

Type material. Holotype, ♀, MALAYSIA: YSFMA in Sabah (4 ◦ 58 ′ N, 117 ◦ 4 ′ E), ex Copsychus malabaricus stricklandii , 9.viii.2015 (Ram´on Soto Madrid) ( MMBC) . Paratypes, 4♀, 26 with the same data as holotype .

Diagnosis. Until now, there were only three species of Myrsidea described on flycatchers ( Muscicapidae ) — Myrsidea subdissimilis Uchida (1926) from Cyanoptila cyanomelana ( Temminck, 1829) in Japan ( Uchida 1926), Myrsidea proterva Złotorzycka (1964) from Muscicapa striata (Pallas, 1764) in Poland ( Złotorzycka 1964) and Myrsidea mariquensis Halajian and Sychra, 2012 from Bradornis mariquensis Smith (1847) in South Africa. Myrsidea ramoni sp.n. is morphologically very close to M. mariquensis . Both species are separated from the first two aforementioned species by a smaller number of tergal setae in the female, especially on tergite I (5–6 vs. more than 10). Female of M. ramoni sp.n. is separated from that of M. mariquensis by 1) shorter DHS 10, i. e. with ratio DHS10/11 0.27–0.45 (vs. 0.59–0.65 for M. mariquensis ); higher number on tergites II–VIII, total number 57–77 (vs. 29–38), and 3) postspiracular setae very long on all segments (vs. conspicuously shorter on tergites III and V). While the male of M. proterva is unknown,

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the male of M. ramoni sp.n. differs, together with male of M. mariquensis , from that of M. subdissimilis by larger dimensions, especially TW (0.44–0.46 vs. 0.40–0.41). Male of M. ramoni sp.n. is separated from that of M. mariquensis by very high number setae on tergites II–VIII (122–132 vs. 44), arranged into continuous row across each segment. This sexual dimorphism is quite unusual within Myrsidea . To our knowledge, it is only known in Myrsidea using Hirundinidae as host, but these lice are well-characterised by their strongly flattened frons ( Złotorzycka, 1964).

Female (n = 5). As in Figs. 4A and 7A . Hypopharyngeal sclerites fully developed. Shape of head as in Fig. 4B . Length of DHS 10, 0.03–0.05; DHS 11, 0.10–0.12; ratio DHS 10/11, 0.27–0.45. Ls5, 0.06–0.07 long, latero-ventral fringe with 10–12 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. Prosternal plate with rounded anterior margin ( Fig. 4A ). First tibia with 3 outer ventro-lateral and 4 dorso-lateral setae. Mesonotum divided. Metanotum not enlarged, with 4–5 marginal setae; metasternal plate with 5–7 setae; metapleurites with 3–4 short strong spiniform setae. Femur III with 15–21 setae in ventral setal brush. Tergites not enlarged and modified as follows: I–II and V–VIII with straight posterior margin, III and IV with small medioposterior convexity ( Fig. 4A ). Abdominal segments with well-defined median gap in each row of tergal setae. Tergal setae (postspiracular setae and on tergites II–VIII also short associated setae are not included): I, 4; II, 6–10; III, 11–12; IV, 10–13; V, 8–11; VI, 9–12; VII, 8–11; VIII, 5–8. Postspiracular setae very long on all segments (0.34–0.53). Inner posterior seta of last tergum not longer than anal fringe setae with length 0.02–0.03; length of short lateral marginal seta of last segment, 0.03–0.04. Pleural setae: I, 5; II, 7–8; III, 7–9; IV, 6–9; V, 6–8; VI, 5–6; VII, 3–5; VIII, 3. Pleurites with only short spine-like setae; pleurites III–V only rarely with 1 anterior seta. Pleurite VIII with inner setae (0.10–0.15) three times as long as outer (0.04–0.05). Anterior margin of sternal plate II with a medial notch. Sternal setae: I, 0; II, 5–6 in each aster, aster setae length: s1, 0.09–0.10; s2, 0.07–0.09; s3, 0.05–0.06; s4, 0.04–0.06; s5, 0.03–0.06; s6, 0.03; with 10–14 marginal setae between asters, 7–10 medioanterior; III, 22–26; IV, 34–39; V, 38–41; VI, 31–36; VII, 7–11; VIII–IX, 10–14; and 10–13 setae on deeply serrated vulval margin; sternites III–VII without medioanterior setae. Anal fringe formed by 37–44 dosral and 35–40 ventral setae.

Dimensions: TW, 0.48–0.51; POW, 0.37–0.38; HL, 0.29–0.31; PW, 0.28–0.30; MW, 0.41–0.45; AW, 0.60–0.63; ANW, 0.22–0.23; TL, 1.51–1.57.

Male (n = 2). As in Figs. 4C and 7B . There is strong sexual dimorphism in presence of continuous row of tergal setae across each segment in male, while female has well-defined median gap in each row of tergal setae. Other characteristics of male are similar as for female except as follows. Length of DHS 10, 0.04–0.05; DHS 11, 0.10; ratio DHS 10/11, 0.43–0.45. Ls5, 0.07 long, latero-ventral fringe with 11 setae. Metanotum not enlarged with 4 marginal setae (the most posterolateral setae are not counted); metasternal plate with 6 setae; metapleurites with 3 short spiniform strong setae. Femur III with 15–19 setae in ventral setal brush. Abdominal segments with continuous row of tergal setae across each segment. Tergal setae (postspiracular setae and on tergites II–VIII also short associated setae are not included): I, 4; II, 11–12; III, 17–18; IV, 18–22; V, 22; VI, 18–20; VII, 19–22; VIII, 16–17. Postspiracular setae very long on all segments (0.27–0.49). Length of inner posterior seta of last tergum, 0.01–0.02; short lateral marginal seta of last segment, 0.02–0.03. Pleural setae: I, 5; II, 5–7; III, 6–8; IV, 6–8; V, 6–7; VI, 6–7; VII, 4–5; VIII, 3. Pleurites with only short spine-like setae. Pleurite VIII with inner setae (0.12–0.14) three times as long as outer (0.04–0.05). Anterior margin of sternal plate II with a medial notch ( Fig. 4D ). Sternal setae: I, 0; II, 4–5 in each aster, aster setae length: s1, 0.09; s2, 0.08; s3, 0.06–0.08; s4, 0.05–0.06; s5, 0.03–0.04; with 10–13 marginal setae between asters, 9–10 medioanterior; III, 19–20; IV, 31–33; V, 35–36; VI,

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28–29; VII, 12; VIII, 5–11; remainder of plate, 6–8; and with 4 setae posteriorly; sternites III–VII without medioanterior setae. With 8 internal anal setae. Genital sac scleriteas in Fig. 4E .

Dimensions: TW, 0.46–0.46; POW, 0.34–0.36; HL, 0.28–0.29; PW, 0.27–0.28; MW, 0.37–0.38; AW, 0.49–0.51; GW, 0.11; GL, 0.44–0.45; ParL, 0.09; GSL, 0.37–0.40; TL, 1.33–1.35.

Etymology. This species epithet is named in honor of Ramon´Madrid Belizon´, cousin of the first author.

Figures

Fig. 4. Myrsidea ramoni sp.n. A, dorso-ventral view of female thorax and abdomen; B, head shape; C, dorsal view of male abdomen; D, male metasternal plate and sternites I–II; E, male genital sac sclerite.

Fig. 7. Habitus. Myrsidea ramoni sp.n. A-B, holotype female (A), paratype male (B). Myrsidea victoriae sp.n. C-D, holotype female (C), paratype male (D).