Picobia myiopagi, Glowska, Eliza & Milensky, Christopher M., 2014

Glowska, Eliza & Milensky, Christopher M., 2014, New species of the genus Picobia (Cheyletoidea: Syringophilidae) parasitizing tyrannid birds (Passeriformes: Tyrannidae), Zootaxa 3821 (3), pp. 373-383 : 378-382

Picobia myiopagi sp. nov.

( Figs. 13–16 , 20 , 24 )

PHYSOGASTRIC FEMALE (holotype). Total body length 755 (665–715 in 6 paratypes). Gnathosoma . Hypostomal apex tapering ( Fig. 15 ). Infracapitulum punctate. Each medial branch of peritremes with ca. 7 chambers, borders between chambers in lateral branches invisible. Stylophore rounded posteriorly, 150 (145) long, punctate in anterior part. Idiosoma . Propodonotal shield represented by 2 narrow sclerites bearing bases of setae ve and si, punctate. Setae ve bases situated anterior to vi. Length ratio of setae vi: ve: si 1:1.2–2:6–12. Bases of setae c1 and se situated at same transverse level. Hysteronotal shield absent. Setae d1 bases situated closer to setae d2 than e2 bases. Length ratio of setae d1: d2: e2 1.4 –1.6:1.6–1.7:1. Pygidial shield strongly sclerotized, double-leaf, covered with pygidial lobes provided with spike-shaped outgrowth, densely punctate. Bases of setae f1 beneath lobes, f2 situated beyond lobes ( Figs. 20 , 24 ). Lengths ratios of setae f1: f2 1:1.2–1.9, h1: h2 1:8.8, f1: h1 1.5–1.7:1, f2: h2 1:3.8. Aggenital setae ag1 situated anterior to ag2, ag2 anterior to ag3. Length ratio of ag1: ag2: ag3 1.4:1:1.8–2.4. Pseudanal setae ps1: ps2 subequal in length or ps2 1.5 times longer than ps1. Setae g filiform, situated on triangular outgrowths of genital lobes. Legs. All coxal fields strongly sclerotized, punctate. Setae 3c 1.9 times longer than 3b. Antaxial and paraxial members of claws pair III and IV unequal in size and shape. Setae tc” III–IV 1.2 times longer than tc’. Lengths of setae: vi 25 (15–20), ve 30 (25–35), si 150 (145–180), c2 180 (160–180), se 160 (170–185), c1 155 (165–190), d2 170 (160–170), d1 160 (145–160), e2 100 (95–100), f1 50 (35–45), f2 60 (65–80), h1 30 (30), h2 (265), ag1 80 (65–70), ag2 55 (55–70), ag3 115 (115–150), g1 55 (55–65), ps1 20 (20), ps2 20 (20–30), tc’ 60, tc” 70, lR’III 30, lR’IV 25, 3b 35, 3c 65, 4c 90.

MALE: Unknown.

Type material. Female holotype and 6 female paratypes (physogastric forms) from quills of body feathers of Myiopagis gaimardii (Orbigny) ( USNM 637120) ( Passeriformes : Tyrannidae ), GUYANA: Upper Takutu - Upper Essequibo, Upper Rewa River, 12 August 2006, coll. C. M. Milensky (mites sampled by E. Glowska).

Additional material. Four females (physogastric forms) from Elaenia ruficeps Pelzeln ( USNM 639133), GUYANA, Cuyuni-Mazaruni, Paruima, ca. 19 km N, at Mt. Holitipu, 16 February 2007, coll. C. M. Milensky and 6 females (physogastric forms) from quills of body feathers of Myiopagis subplacens (Sclater) ( USNM 643882) ( Passeriformes : Tyrannidae ), PERU: Tumbes, El Caucho Biological Station, 10 June 2009, coll. B. K. Schmidt (mites sampled by E. Glowska).

Material deposition. Holotype female and 3 female paratypes, 2 females from Elaenia ruficeps and 3 females from Myiopagis subplacens are deposited in the USNM, 3 female paratypes, 2 females from E. ruficeps and 3 females from M. subplacens in the AMU.

Etymology. The specific epithet derives from the generic name of the host.

Differential diagnosis. Picobia myiopagi sp. nov. is most similar to P. sayornis Glowska, 2014 described from the Black Phoebe Sayornis nigricans (Swainson) ( Passeriformes : Tyrannidae ) from Peru (Glowska 2014). In females of both species the propodonotal shield is represented by two punctate, saber-like lateral sclerites, bearing bases of setae ve and si, the peritremes median branches are with ca. 7 chambers and borders between chambers in the lateral branches are invisible, the hysteronotal shield is absent, the pygidial shield is double-leaf and covered by lobes, agenital setae ag1 are situated anterior to ag2 and ag2 anterior to ag3, the genital setae are filiform and situated on the genital lobes and the antaxial and paraxial members of claw pairs III–IV are unequal. Picobia myiopagi sp. nov. is distinguishable from P. sayornis by the shape of the pygidial lobes provided with a large strongly sclerotized spike-shaped outgrowth ( Figs. 20 , 24 ) and by the length of setae vi 15–25, ve 25–35, d1 145–160, d2 160–170, e2 95 –100, f1 35–50, f2 60–80, ag1 65–80. Females of P. sayornis have the pygidial lobes with 2–4 small, blunt-ended protuberances ( Figs. 17 , 21 ) and the length of setae are vi 30–35, ve 40–45, d1 185–195, d2 180–190, e2 130–135, f1 65, f2 105, ag1 100.

Figures

FIGURES 13 – 16. Picobia myiopagi sp. nov., physogastric female: 13 — dorsal view, 14 — ventral view, 15 — hypostomal apex, 16 — peritremes. Scale bars: 13, 14 = 100 µm; 15, 16 = 20 µm.

FIGURES 17 – 20. Pygidial shields of Picobia spp., females: 17 — Picobia sayornis, 18 — P. ochoi sp. nov., 19 — P. schmidti sp. nov., 20 — P. myiopagi sp. nov. Scale bars: 17 — 20 = 100 µm.

FIGURES 21 – 24. Pygidial shields of Picobia spp., females: 21 — Picobia sayornis, 22 — P. ochoi sp. nov., 23 — P. schmidti sp. nov., 24 — P. myiopagi sp. nov.