Platyacarus dendrocolapti 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 : 13-17

Platyacarus dendrocolapti Mironov sp. n.

( Figs. 4–6 )

Type material. Male holotype ( ZISP 6556 ), 11 male and 8 female paratypes from Dendrocolaptes picumnus Lichtenstein , MHK, 1820 ( Furnariidae ), COSTA RICA, Tapantí National Park , Sector Tapantí, Cordillera de Talamanca Mts., 09°46’N, 83°47’W, 9 August 2009, collectors I. Literak, O. Sychra and M. Capek.

Depository. Holotype, 9 male, 6 female paratypes (ZISP 6557–6571),—ZISP; 1 male and 1 female paratype— UMMZ (BMOC-15-1028-007), 1 male and 1 female paratype—IMUCR.

Description. MALE (holotype, range for 10 paratypes in parentheses). Idiosoma, length × width, 335 (225– 335) × 145 (140–150), length of hysterosoma 215 (210–220). Prodorsal shield: entire, antero-lateral extensions rounded, lateral margins with narrow incisions extending to bases of setae se, posterior margin with blunt-angular median extension, 115 (110–115) in length, 87 (85–90) in width, surface uniformly sclerotized, without ornamentation ( Fig. 4 A). Bases of scapular setae se separated by 47 (45–50). Setae c2 and cp on humeral shields. Setae c3 lanceolate, 24 (23–25) × 6 (6–7). Distance between prodorsal and hysteronotal shields 15 (10–15).

Hysteronotal shield: 205 (190–205) in length and 87 (80–90) 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 27 (27–38). Opisthosomal lobes poorly developed, as a pair of short and rounded convexities between bases of setae h2. Terminal cleft small triangular, 14 (12–15) long. Terminal lamellae tongue-shaped, short, with fine dorsal punctation, 16 (15–17) in length (from lobar apices to distal margins), 13 (13–15) in wide at base, distance between inner margins of lamellae 4 (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 72 (65–75), d2:e2 87 (85–90), e2:h3 50 (45–50), h2:h2 62 (57–65), h3:h3 44 (40–45), ps2:ps2 70 (65–70), h1:h3 30 (27–32), ps1:h3 5 (3–5), d1:d2 25 (22–28), e1:e2 30 (30–34).

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. 4 B). Epimerites IVa small. Rudimentary sclerites rEpIIa present. Bases of epimerites I, II not inflated. Genital arch low, 10 (7–10) long and 20 (20–24) wide, its apex at level of posterior margin of trochanters IV; genital organ stylet-like, 18 (14–18) long, not reaching level of setae g ( Fig. 6 A). Distance from genital arch apex to level of setae h3 102 (95–105). Bases of genital papillae connected, situated at level of genital arch apex. Paragenital apodemes represented by a pair of very thin longitudinal sclerites lateral to genital arch. Antero-lateral pieces of adanal shields present, reniform or seed-shaped; postero-medial pieces of adanal shields flanking anal opening and bearing setae ps3. Adanal suckers cup-shaped, 14 (12–14) in apical diameter; corolla with 9 truncate denticles, those on anterior margin of corolla slightly larger than on posterior one. Setae 4b posterior to level of setae 3a. Distance between ventral setae: 4b:3a 8 (8–10), 4b:4a 43 (40–44), 4a:g 40 (35–40), g:ps3 30 (27–30), g:g 18 (18–20), ps3:ps3 13 (12–14), ps3:h3 50 (47–50).

Femora I, II with narrow ventral crest. Solenidion σ1 of genu I half as long as this segment and situated at its midlevel ( Fig. 6 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. 6 D). Solenidion φ of tibia IV extending beyond apex of this segment. Length of solenidia: σ 1 I 15 (13–15), σ III 13 (12–14), φ IV 32 (32–38).

FEMALE (range for 8 paratypes). Idiosoma, length × width, 540–555 × 185–200, length of hysterosoma 390– 410. Prodorsal shield: entire, anterolateral extensions rounded, lateral margins without incisions, posterior margin with widely rounded short median extension, 140–145 long and 135–145 wide, surface without ornamentation ( Fig. 5 A). Bases of setae se separated by 75–80. Setae c2 and cp on humeral shields. Setae c3 lanceolate, 25–30 × 7–8. Distance between prodorsal and hysteronotal shields 10–15. Hysteronotal shields completely split into anterior and lobar shields. Anterior hysteronotal shield: 280–285 in length and 120–130 in width at anterior margin, 145–155 in wide in posterior part, anterior margin straight, posterior margin with very short and wide median extension and a pair of shallow concavities, surface without ornamentation. Setae c1 on anterior hysteronotal shield. Lobar shield: 120–125 in length and 120–125 in width. Opisthosomal lobes 2 times longer than wide at base. Terminal cleft hourglass-shaped, with lateral margins slightly convex, 85–90 in length, 25–35 in width at midlevel. Supranal concavity absent. Setae h2 with spindle-like basal enlargement and with filiform apical part, 110–120 in length, 7–8 in width; setae h 3 28–35 in length, about 1/4–1/3 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– 100, d2:e2 100–110, e2:h2 48–53, h2:h3 70–75, h1:h2 35–38, d1:d2 40–52, e1:e2 65–80, h1:h1 55–65, h2:h2 110–115, h2:ps1 42–45.

Epimerites I with posterior tips connected by very thin commissure (in some specimens this commissure absent); epimerites I–II without sclerotized fields ( Fig. 5 B). Epimerites IVa absent. Epigynum semicircular, thick, with bidentate tips extending to level of setae g, 47–50 in length, 72–80 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 short, cone-shaped; primary spermaduct thin, without noticeable enlargement near head of spermatheca; secondary spermaducts about 5 long ( Fig. 6 E). Distance between pseudanal setae: ps2:ps2 60–62, ps3:ps 3 20–23, ps2:ps 3 26–28.

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 contraction separating lobar region. Solenidion φ of tibia IV half as long as corresponding tarsus. Length of solenidia: σ1 I 20–22, σ III 11–14, φ III 30–34, φ IV 18–23.

Differential diagnosis. As with the previous species, Platyacarus dendrocolapti sp. n., belongs to the oligolaccius species group and is most similar to P. sittasomi and P. dendrocinclae in having the male idiosoma distinctly elongated (length/width ratio about 2.2–2.5) and the terminal lamellae tongue-shaped. Platyacarus dendrocolapti differs from P. sittasomi and P. dendrocinclae by the following features: in males, the genital organ is much shorter (14–18 µm) and does not extend to the level of genital setae g; in females, the median extension on the posterior margin of the prodorsal shield is widely rounded and setae h3 are about 1/4–1/3 the length of the terminal appendages. In males of P. dendrocinclae and P. sittasomi , the genital organ is longer than 35 µm and extends distinctly beyond the level of setae g; in females, the median extension on the posterior margin of the prodorsal shield is blunt-angular and setae h3 are about 1/5 the length of the terminal appendages. Additionally, males of P. dendrocolapti differ from those P. sittasomi in having the antero-lateral pieces of the adanal shields reniform or ovate (vs. narrow, bow-shaped in P. sittasomi ) and the presence of paragenital apodemes (vs. absence); and females are distinguished by the lack of lacunae on the hysteronotal shield (vs. presence).

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

Figures

FIGURE 4. Platyacarus dendrocolapti Mironov sp. n., male. A—dorsal view, B—ventral view.

FIGURE 5. Platyacarus dendrocolapti Mironov sp. n., female. A—dorsal view, B—ventral view.

FIGURE 6. Platyacarus dendrocolapti 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.