Platyacarus sclerurus Mironov, 2017

Mironov, Sergey V., Literak, Ivan, Sychra, Oldrich & Capek, Miroslav, 2017, Feather mites of the subfamily Proctophyllodinae (Acari: Proctophyllodidae) from passerines (Aves: Passeriformes) in Costa Rica, Zootaxa 4297 (1), pp. 1-105 : 22-25

Platyacarus sclerurus Mironov sp. n.

( Fig. 10–12 )

Type material. Male holotype ( ZISP 6591 ), 11 male and 17 female paratypes from Sclerurus mexicanus Sclater , PL, 1857 ( Furnariidae ), COSTA RICA, Tapantí National Park , Sector Tapantí, Cordillera de Talamanca Mts., 09°46’N, 83°47’W, 10 August 2009, collectors I. Literak, O. Sychra and M. Capek.

Depository. Holotype, 9 male and 15 female paratypes (ZISP 6592–6615)—ZISP; 1 male and 1 female paratype—UMMZ (BMOC-15-1028-009), 1 male and 1 female paratype—IMUCR.

Description. MALE (holotype, range for 10 paratypes in parentheses). Idiosoma, length × width, 295 (290– 305) × 145 (140–150), length of hysterosoma 195 (190–205). Prodorsal shield: entire, antero-lateral extensions fused with epimerites Ia, lateral margins without incisions, posterior margin with short and widely rounded median extension, 105 (100–110) in length, 100 (95–105) in width, surface with numerous minute circular lacunae ( Fig. 10 A). Bases of scapular setae se separated by 57 (55–60). Setae c2 and cp on humeral shields. Setae c3 lanceolate, 22 (20–22) × 7 (6–7.5). Distance between prodorsal and hysteronotal shields 10 (8–10). Hysteronotal shield: 185 (180–195) in length and 88 (85–90) in width; anterior margin straight, surface with numerous minute circular lacunae. Setae c1 on hysteronotal shield. Small metapodosomal sclerites situated laterally between levels of trochanters III and IV. Supranal concavity well expressed, length from anterior end to anterior margin of terminal cleft 35 (30–35). Opisthosomal lobes poorly developed, as a pair of short and rounded convexities between bases of setae h2. Terminal cleft small triangular, 15 (15–16) long. Terminal lamellae tongue-shaped, short, with fine dorsal punctation, 20 (17–20) in length, 14 (13–15) in wide at base, distance between inner margins of lamellae about 5. Setae f2 present. Setae h1 closer to level of setae ps2 than to e2. Setae ps1 on inner margin of opisthosomal lobes, slightly anterior to level of setae h2. Distance between dorsal setae: c2:d2 60 (60–65), d2:e2 78 (75–80), e2:h3 50 (50–55), h2:h2 58 (55–60), h3:h3 40 (40–45), ps2:ps2 70 (65–72), h1:h3 30 (26–30), ps1:h3 5 (3–5), d1:d2 18 (17–22), e1: e2 38 (25–38).

Epimerites I fused into a Y, sternum about half of the total length of epimerites; epimerites I, II without wide surface fields ( Fig. 10 B). Epimerites IVa small. Rudimentary sclerites rEpIIa present. Bases of epimerites I, II not inflated. Bases of trochanters III flanked by sclerotized band connecting corresponding epimerites. Bases of trochanter IV flanked by triangular sclerotized fields of epimerites IV. Genital arch of moderate size, 18 (16–18) long and 30 (30–32) wide, its apex at midlevel of trochanters IV; genital organ stylet-like, 38 (35–38) long, reaching midlevel between setae g and ps3 ( Fig. 12 A). Distance from genital arch apex to level of setae h3 98 (98– 105). Bases of genital papillae not connected, situated at level of genital arch apex. Paragenital apodemes represented by a pair of thin longitudinal sclerites lateral to genital arch. Antero-lateral pieces of adanal shields ovate; postero-medial pieces of adanal shields flanking anal opening and bearing setae ps3. Adanal suckers barrelshaped, 18 (17–18) in apical diameter; corolla with 8 denticles, those on anterior margin of corolla slightly smaller than on posterior one. Setae 4b posterior to level of setae 3a. Distance between ventral setae: 4b:3a 10 (10–12), 4b:4a 38 (35–40), 4a:g 38 (38–41), g:ps3 28 (26–30), g:g 10 (10–12), ps3:ps3 11 (11–13), ps3:h3 50(48–50).

Femora I, II with narrow ventral crest. Solenidion σ 1 I half as long as genu I and situated closer to distal margin of this segment ( Fig. 12 B, C). Solenidion σ of genu III situated at midlevel of this segment. Legs IV with ambulacral disc extending to level of terminal lamellae. Tarsus IV 28 (27–30) long, without apical or dorsal processes; button-like seta d situated in basal half of this segment ( Fig. 12 D). Solenidion φ of tibia IV extending to apex of this segment. Length of solenidia: σ 1 I 10 (10–12), σ III 12 (10–13), φ IV 30 (30–35).

FEMALE (range for 10 paratypes). Idiosoma, length × width, 435–455 × 195–200, length of hysterosoma 300–315. Prodorsal shield: entire, anterolateral extensions rounded, lateral margins without incisions, posterior margin with widely rounded short median extension, 130–140 long and 145–155 wide, surface without ornamentation ( Fig. 11 A). Bases of setae se separated by 92–95. Setae c2 and cp on humeral shields. Setae c3 lanceolate, 24–29 × 6.5–7.5. Distance between prodorsal and hysteronotal shields 8–10. Hysteronotal shields completely split into anterior and lobar shields. Anterior hysteronotal shield: 225–235 in length and 120–130 in width at anterior margin, 140–145 in wide in posterior part, anterior margin slightly concave, posterior margin with short and wide median extension and a pair of shallow concavities, surface with minute circular lacunae in posterior half. Setae c1 on anterior hysteronotal shield. Lobar shield: 78–82 in length and 115–120 in width. Opisthosomal lobes slightly longer than wide at base. Terminal cleft almost rectangular, lateral margins slightly convex, 48–50 in length, 18–23 in width at midlevel. Supranal concavity absent. Setae h2 with spindle-like basal enlargement and with filiform apical part, 100–110 in length, 6–7 in width; setae h3 60–65 in length, about 2/3rd of terminal appendages. Setae f2 present. Setae h1 inserted on soft tegument between the anterior hysteronotal and lobar shields. Setae ps1 on lateral margins of terminal cleft, close to lobar apices. Distance between dorsal setae: c2:d2 78–88, d2:e2 125–135, e2:h2 55–60, h2:h3 40–44, h1:h 2 30–32, d1:d 2 20–25, e1: e2 50–55, h1:h1 35–42, h2:h2 100–105, h2:ps 1 27–30.

Epimerites I with posterior tips connected by very thin commissure; epimerites I, II without sclerotized fields ( Fig. 11 B). Epimerites IVa present, heavily sclerotized. Bases of epimerites I, II not inflated. Coxal fields II laterally with large sclerotized areas. Bases of trochanters III–IV flanked by sclerotized bands connecting corresponding epimerites. Epigynum semicircular, thick, with acute tips extending to level of genital papillae, 38– 42 in length, 64–68 in width, without lateral extensions. Genital papillae not connected at bases. Setae ps2 at midlevel of anal opening. Translobar apodemes fused to each other anterior to terminal cleft. Copulatory opening situated ventral, near anterior margin of translobar apodemes, and covered with posterior ends of anal flaps. Head of spermatheca small cone-shaped, poorly sclerotized; primary spermaduct with short monotonous enlargement toward head of spermatheca; secondary spermaducts 10–12 long ( Fig. 12 E). Distance between pseudanal setae: ps2:ps2 60–62, ps3:ps 3 25–28, ps2:ps 3 8–10.

Legs I, II as in male. Solenidion σ of genu III situated in basal part of this segment. Legs IV with ambulacral disc extending to level of setae h2. Solenidion φ of tibia IV slightly shorter than corresponding tarsus. Length of solenidia: σ 1 I 15–17, σ III 14–16, φ III 37 –42, φ IV 25–28.

Differential diagnosis. The new species Platyacarus sclerurus sp. n. is very close to P. minor (Berla, 1959) from Sclerurus scansor (Ménétriès, 1835) ( Furnariidae ) described from Brazil (Berla 1959) in having setae f 2 in both sexes and a pair of small metapodosomal sclerites in males. Platyacarus sclerurus differs from P. minor by the characters as follows: in both sexes, the posterior margin of the prodorsal shield has a short and widely rounded median extension; in males, the anterior margin of the hysteronotal shield is straight, epimerites IVa are present, and the terminal lamellae are close to each other, with their inner margins separated by 5 µm; in females, the bases of trochanters II–IV are flanked by sclerotized bands, the terminal cleft is 2.1–2.7 times longer than wide in the narrowest part (48–50 ×18–23 µm) and the prodorsal shield lacks any lacunae. In both sexes of P. minor , the posterior margin of the prodorsal shield is straight or slightly convex; in males, the anterior margin of the hysteronotal shield is concave, epimerites IVa are absent, and the terminal lamellae are separated by a distance of about 15 µm; in females, the bases of trochanters II–IV are not flanked by sclerotized bands, the terminal cleft is narrow (c. 10 µm in narrowest part) and the prodorsal shield bears minute circular lacunae.

Etymology. The specific epithet is taken from the generic name of the type host and is a noun in apposition.

Figures

FIGURE 10. Platyacarus sclerurus Mironov sp. n., male. A—dorsal view, B—ventral view.

FIGURE 11. Platyacarus sclerurus Mironov sp. n., female. A—dorsal view, B—ventral view.

FIGURE 12. Platyacarus sclerurus Mironov sp. n., details. A—opisthosoma of male, ventral view, B, C—legs I and II of male, dorsal view, D—tibia and tarsus IV of male, dorsal view, E—spermatheca and spermaducts.