Platyacarus dendrocinclae 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 : 9-13

Platyacarus dendrocinclae Mironov sp. n.

( Figs. 1–3 )

Type material. Male holotype ( ZISP 6 197), 15 male and 7 female paratypes from Dendrocincla homochroa (Scalter. PL, 1860) ( Furnariidae ), COSTA RICA, Rincón de la Vieja National Park , Cordillera de Guanacaste Mts., 10°46'N, 85°18'W, 20 August 2009, collectors I. Literak, O. Sychra and M. Capek.

Depository. Holotype, 12 male and 4 female paratypes (ZISP 6198–6213)—ZISP; 2 male and 2 female paratypes—UMMZ (BMOC-15-1028-014), 1 male and 1 female paratype —IMUCR.

Description. MALE (holotype, range for 10 paratypes in parentheses). Idiosoma, length × width, 310 (290– 310) × 135 (130–140), length of hysterosoma 195 (180–200). Prodorsal shield: entire, antero-lateral extensions rounded, lateral margins with incisions almost extending to setae se, posterior margin with blunt-angular median extension, 110 (105–110) in length, 87 (80–90) in width, surface uniformly sclerotized, without ornamentation or poorly sclerotized areas ( Fig. 1 A). Bases of scapular setae se separated by 50 (45–50). Setae c2 and cp on humeral shields. Setae c3 lanceolate, 21 (21–23) × 6 (6–6.5). Distance between prodorsal and hysteronotal shields 12 (10– 15). Hysteronotal shield: 185 (175–190) in length and 82 (80–85) in width; anterior margin slightly concave, surface without ornamentation. Setae c1 on hysteronotal shield. 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, 10 (10–12) long. Terminal lamellae tongue-shaped, short, with fine dorsal punctation, 15 (14–16) in length (from lobar apices to distal margins), 12 (12–13) in wide at base, distance between inner margins of lamellae 5 (3–5). Setae f2 absent. Setae ps1 on inner margin of opisthosomal lobes, at level of setae h2. Setae h1 approximately at midlevel of supranal concavity. Distance between dorsal setae: c2:d2 65 (62–70), d2:e2 85 (77–88), e2:h3 35 (35–43), h2:h2 52 (50– 55), h3:h3 37 (35–40), ps2:ps2 62 (60–65), h1:h3 32 (30–35), ps1:h3 5 (3–5), d1:d2 20 (20–28), e1:e2 35 (27–38).

Epimerites I fused into a narrow V, with posterior parts of these epimerites very close to each other; epimerites I, II without surface fields ( Fig. 1 B). Epimerites IVa indistinct. Rudimentary sclerites rEpIIa present. Bases of epimerites I, II not inflated. Genital arch 15 (15–16) long and 27 (25–30) wide, its apex at midlevel of trochanters IV; genital organ (aedeagus in genital sheath) sword-like, 40 (40–45) long, reaching anterior end of anal opening ( Fig. 3 A). Distance from genital arch apex to level of setae h3 92 (87–95). Bases of genital papillae connected, situated at level of genital arch apex. Paragenital apodemes rudimentary, represented by a pair of very thin longitudinal sclerites lateral to genital arch. Antero-lateral pieces of adanal shields present, reniform or seedshaped; postero-medial pieces of adanal shields flanking anal opening and bearing setae ps3. Adanal suckers cupshaped, 12 (11–13) in apical diameter; corolla with 8–9 truncate denticles, those on anterior margin of corolla slightly larger than on posterior one. Setae 4b slightly posterior to level of setae 3a. Distance between ventral setae: 4b:3a 7 (7–9), 4b:4a 35 (35–37), 4a:g 40 (35–40), g:ps3 26 (24–26), g:g 17 (16–17), ps3:ps3 10 (10–11), ps3:h3 45(40–45).

Femora I, II with narrow ventral crest. Solenidion σ1 of genu I shorter than this segment and situated at its midlevel. Solenidion σ of genu III situated approximately at midlevel of this segment ( Fig. 3 B–D). Legs IV with ambulacral disc extending to level of terminal lamellae. Tarsus IV 25 (24–26) long, without apical or dorsal processes; button-like seta d situated in basal half of this segment ( Fig. 3 E). Solenidion φ of tibia IV extending to midlevel of ambulacral disc. Length of solenidia: σ 1 I 12 (10–12), σ III 8 (8–10), φ IV 37 (35–38).

FEMALE (range for 7 paratypes). Idiosoma, length × width, 480–500 × 175–190. Length of hysterosoma 350– 360. Prodorsal shield: form almost as in male, posterior margin with a more strongly expressed blunt-angular median extension and a pair of shallow concavities, 132–140 long and 130–135 wide, surface without ornamentation ( Fig. 2 A). Bases of setae se separated by 70–75. Setae c2 and cp on humeral shields. Setae c3 lanceolate, 23–25 × 6–7.5. Distance between prodorsal and hysteronotal shields 10–15. Hysteronotal shields completely split into anterior and lobar shields. Anterior hysteronotal shield: 255–270 in length and 115–120 in width at anterior margin, 130–135 in width in posterior part, anterior margin straight, posterior margin with short and wide median extension (in some specimens with uneven border), surface without ornamentation. Setae c1 on anterior hysteronotal shield. Lobar shield: 90–95 in length and 98–105 in width. Opisthosomal lobes about 2 times longer than wide. Terminal cleft almost rectangular, lateral margins slightly convex, 62–65 in length, 20–22 in width at midlevel. Supranal concavity absent. Setae h2 with spindle-like basal enlargement and with filiform apical part, 75–83 in length, 6–7.5 in width; setae h 3 25–28 in length, about 1/5th of terminal appendages. Setae f2 absent. Setae h1 inserted on soft tegument between the anterior hysteronotal and lobar shields. Setae ps1 on lateral margins of terminal cleft, closer to lobar apices than to level of setae h2. Distance between dorsal setae: c2:d2 95–98, d2:e2 155–160, e2:h2 40–45, h2:h3 47–50, h1:h2 35–37, d1:d 2 30–40, e1:e2 65–70, h1:h1 50–55, h2:h2 90–95, h2:ps 1 25–28.

Epimerites I with posterior tips connected by very thin commissure (in some specimens this commissure absent); epimerites I–II without sclerotized fields ( Fig. 2 B). Epimerites IVa absent. Epigynum semicircular, thick, with acute tips almost extending to level of setae g, 38–45 in length, 65–70 in width, without lateral extensions. Genital papillae connected at bases. Setae ps2 approximately at level of posterior half of anal opening. Translobar apodemes fused to each other anterior to terminal cleft. Copulatory opening situated ventrally, near anterior margin of translobar apodemes and covered with posterior ends of anal flaps. Head of spermatheca very short; primary spermaduct thin, with monotonous enlargement toward head of spermatheca; secondary spermaducts 10–12 long ( Fig. 3 G). Distance between pseudanal setae: ps2:ps2 55–60, ps3:ps 3 20–22, ps2:ps 3 22–25.

Legs I, II as in male. Solenidion σ of genu III situated in basal part of this segment. Legs IV with ambulacral discs extending to level of contraction separating lobar region. Solenidion φ of tibia IV half as long as corresponding tarsus. Length of solenidia: σ1 I 15–20, σ III 10–12, φ III 30–32, φ IV 15–18.

Differential diagnosis. The new species Platyacarus dendrocinclae sp. n. belongs to the oligolaccius species group in having the prodorsal shield entire and uniformly sclerotized in both sexes, and the adanal suckers with an indented corolla and tongue-shaped terminal lamellae in males. Among the previously known species, the new species is most similar to P. sittasomi described from Sittasomus griseicapillus (Vieillot) (Furnariidae) in Brazil ( Hernandes et al. 2007) in having the prodorsal shield with relatively short lateral incisions not extending to setae se in both sexes and the idiosoma noticeably elongated in males (with length/width ratio 2.2–2.5). Platyacarus dendrocinclae differs from P. sittasomi by the following features: in males, the genital organ is 40–45 µm long and extends to the anterior end of the anal opening, the paragenital apodemes are present, and the antero-lateral pieces of the adanal shield are seed-shaped or reniform; in females, the median extension of the prodorsal shield extends distinctly beyond the level of the posterior angles of this shield, the posterior margin of the anterior hysteronotal shield has a short and wide median extension, and genual solenidion σ 1 I is half as long as genu I. In males of P. sittasomi , the genital organ is about 35 µm long and maximally extends to the midlevel between the bases of setae g and ps3, the paragenital apodemes are absent, and the antero-lateral pieces of the adanal shield are shaped as transverse bows; in females, the tip of the median extension and posterior angles of the prodorsal shield are at the same transverse level, the posterior margin of the anterior hysteronotal shield is straight or slightly convex, and genual solenidion σ 1 I is similar in length to this segment.

Etymology. The specific epithet is derived from the generic name of the type host and is a noun in the genitive case.

Figures

FIGURE 1. Platyacarus dendrocinclae Mironov sp. n., male. A—dorsal view, B—ventral view.

FIGURE 2. Platyacarus dendrocinclae Mironov sp. n., female. A—dorsal view, B—ventral view.

FIGURE 3. Platyacarus dendrocinclae Mironov sp. n., details. A—opisthosoma of male, ventral view, B – D—legs I – III of male, dorsal view, E—tibia and tarsus IV of male, dorsal view, F—subcapitulum of male, ventral view, G—spermatheca and spermaducts. Abbreviations: co—copulatory opening, hs—head of spermatheca, pd—primary spermaduct, sd—secondary spermaduct.