Trichorhynchiella myiarchus, Klompen, Hans, 2014

Klompen, Hans, 2014, New Harpirhynchinae Dubinin (Acariformes: Harpirhynchidae) — intracutaneous and feather-base parasites of birds, Zootaxa 3860 (4), pp. 301-324 : 304-305

Trichorhynchiella myiarchus sp. nov.

( Figs. 1–3 )

Description. FEMALE (holotype, Figs. 1 and 2 ). Body 680 long (650 in 2 paratypes) and 610 wide (585–600). Gnathosoma 125 long (120–125) and 170 wide (165–170). Subcapitular setae m absent. Palp 75 long (70–75) and 50 wide (50–60). Palpalae dF 35 long (35–40) and dG 30 long (30–35), thickened and distinctly pectinate, palpalae l”G long 20 (20–23) and smooth. Setae vF smooth, 40 long (38–40). Peritrematal branch about 50 long. Dorsal shield present, 300 long (280–300) and 175 wide (165–175). Dorsal idiosomal surface with 2 large lateral areas covered by oval granules; area immediately behind gnathosoma and posterior to dorsal shield covered by striations without granules. Setae vi, ve, si, se, and c2 all serrate, 80–100 long. Setae h2 90 long (90–105) and smooth, located dorsally at bases of dorso-terminal lobes. Dorso- and ventro-terminal lobes of idiosoma poorly developed. Vulvar slit about 250 long. Vulvar fold situated in median part of idiosoma almost equidistantly between insertions of legs II and III. Setae 1a, 1c, 3a 70–40 long, and h1 33–35 long—all smooth. Legs I with 4 articulated segments; legs II with 5 articulated segments. All tactile setae of legs I and II smooth, filiform, except p’ I and p” I–II eupathidia. Solenidia ω 1 I and ω 1 II almost straight, subconical, 11–12 long. Number of setae on basal segment of legs I and femora-genua of legs II variable (1–3), genua I and II always bearing 1–3 setae. Basal segment of legs III with 1–2 setae; apical segment about 40 long and 50 wide, with 7–9 setae. Articulated segment of legs IV about 85 long and 65 wide, with 7–9 setae.

MALE (4 paratypes, Fig. 3 ). Body 385–410 long and 325–350 wide. Gnathosoma 110–120 long and about 145 wide. Subapical setae m and n present. Palpalae strongly thickened: dF 40–45 long, with 3–4 short projections; dG 35–40 long, with large anteriorly directed projection located in median part and 2 small subapical projections; l”G 25–30 long with 2–3 short projections. Setae vF 50–70 long, smooth. Idiosoma 265–290 long. Dorsal shield trapezium-like, 170–175 long and 235–250 wide in basal part; its posterior margin slightly concave. Aedeagus 185–200 long. Genital opening situated at anterior margin of dorsal shield. Three pairs of genital setae present, distance between setae g1 and g2 3 to 4 times greater than between g2 and g3. Setae vi, ve, si, se, and c2 75–90 long, serrate, situated off dorsal shield. Dorsal striated cuticle of idiosoma without granules or tubercles. Setation legs I–II (solenidia in parentheses): tarsi 8 (1)–7(1), tibiae 5–5, genua 3–3, femorae 3–2, trochanters 1–1. Legs III with 2 articulated segments bearing 0–1 and 5–6 setae, respectively. Legs IV with one articulated segment bearing 2 setae.

Type material examined. Holotype female ( OSAL 0083898), 2 female and 4 male paratypes ( OSAL 0083858-0083860, 0083895-0083897) from Myiarchus crinitus (Linnaeus) ( Passeriformes : Tyrannidae ) [base of feathers], North America, no other data.

Holotype deposition. OSAL.

Etymology. The species name derives from the generic name of the host and is a noun in apposition.

Differential diagnosis. This species is close to Trichorhynchiella phleocryptes Bochkov and OConnor, 2014 (only female known). In females of these species, the dorsal shield is present, palpalae dF and dG are thickened, genua I and II bear setae, and the preapical segment of legs III bears 1–2 setae. These species differ by the following features. In T. myiarchus sp. nov., subcapitular setae m are absent, palpal setae l”G are smooth and 1.4 times shorter than dF, the vulvar fold is situated in the median part of the idiosoma, between the levels of leg II and III insertions, legs II have five articulated segments, the preapical segment of legs III bears 1–2 setae, the apical segments of legs III and IV bear 7–9 setae each. In T. phleocryptes , subcapitular setae m are present, palpal setae l”G are pectinate and slightly longer than dF, the vulvar fold is situated in the anterior third of the idiosoma, almost at the level of leg II insertions, legs II have four articulated segments, the preapical segment of legs III bears one seta, and the apical segments of legs III and IV bear 14 setae each.

Figures

FIGURE 1. Trichorhynchiella myiarchus sp. nov., female. A—dorsal view; B—ventral view.

FIGURE 2. Trichorhynchiella myiarchus sp. nov., details of female. A—palp in dorsal view; B leg I in ventral view; C—leg II in ventral view; D—apical segment of leg III in ventral view; E—leg IV in ventral view.

FIGURE 3. Trichorhynchiella myiarchus sp. nov., male. A—dorsal view; B—ventral view; C—palpalae in dorsal view. Scale bars: A, B = 100 µm; C = 50 µm.