Nycteridocaulus platyrinchi 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 : 53-57

Nycteridocaulus platyrinchi Mironov sp. n.

( Figs. 28–30 )

Type material. Male holotype ( ZISP 6316 ), 9 male and 14 female paratypes from Platyrinchus cancrominus Sclater , PL and Salvin, 1860 ( Tyrannidae ), COSTA RICA, Rincón de la Vieja National Park , Cordillera de Guanacaste Mts., 10°46'N, 85°18'W, 800 m, 20 August 2009, collectors I. Literak, O. Sychra and M. Capek.

Depository. Holotype, 7 male, 12 female paratypes (ZISP 6317–6335)—ZISP; 1 male and 1 female paratype—UMMZ (BMOC-15-1028-013), 1 male and 1 female paratype—IMUCR.

Description. MALE (holotype, range for 9 paratypes in parentheses). Idiosoma, length × width, 285 (275– 290) × 140 (140–145), length of hysterosoma 180 (140–180). Prodorsal shield: anterolateral extensions acute, lateral margins entire, posterior margin slightly concave, 95 (95–105) in length and 105 (105–120) in width, surface without ornamentation ( Fig. 28 A). Setae ve rudimentary. Scapular setae se separated by 62 (60–64). Setae c2 and cp on humeral shields. Setae c3 lanceolate, 18 (18–20) × 4 (4–5). Distance between prodorsal and hysteronotal shields 40 (30–40). Hysteronotal shield: 175 (170–185) in length and 87 (85–90) in width; anterior margin strongly concave, surface without ornamentation. Opisthosoma slightly narrowed posteriorly, with slightly concave margins at level of setae ps2. Opisthosomal lobes as very short and wide convexities; terminal lamellae semicircular, with radial striation, 14 (14–16) in length and 23 (23–25) in width. Terminal cleft small, semicircular, not extending to level of setae h2, about 5 long, 15 (14–15) in width at level of setae ps1, occupied by narrow interlobar membrane. Supranal concavity present, opened posteriorly into terminal cleft. Setae h2 situated on semiovate lateral extensions of opisthosomal lobes; setae ps1 on postero-medial margins of lobes, slightly posterior to level of setae h3; setae h1 between levels of setae h3 and h2. Distance between dorsal setae: c2:d2 62 (57–62), d2:e2 72 (69–72), e2:h3 33 (33–41), h2:h2 63 (60–67), h3:h3 55 (52–58), ps2:ps2 60 (60–68), h1:h3 3 (3–7), d1:d2 24 (20–25), e1: e2 22 (22–25).

Epimerites I free, close to each other, posterior tips slightly divergent; epimerites I, II with narrow sclerotized fields; epimerites IVa present ( Fig. 28 B). Rudimentary sclerite rEpIIa absent. Trochanters III flanked by sclerotized band connecting bases of epimerites III and IIIa. Inner ends of epimerites IIIa with small triangular sclerotized areas. Genital apparatus situated at level of trochanters IV. Genital arch with distal ends of its branches strongly widened and directed laterally, 12 (12–15) in length and 37 (35–38) in width. Aedeagus stylet-like, 18 (18–20) in length, reaching level of setae g ( Fig. 30 A). Genital papillae on large ovate plates anterolateral to genital arch. Distance from genital arch apex to bases of setae ps1 92 (90–95). Pregenital apodemes absent. Setae 4a on soft tegument, setae 4b on sclerotized areas of epimerites IIIa. Adanal suckers 13 (10–13) in diameter, corolla with 13– 14 denticles. Adanal shields represented by two pairs of sclerites: anterolateral pair shaped as narrow sclerites transversely oriented, posteromedial shaped as large plates of irregular form with setae ps3 on anterior margins. Opisthoventral shields long and narrow, with anterior angle extending to level of setae ps3. Setae ps2 and f2 situated submarginally. Distance between ventral setae: 3a:4b 10 (7–10), 4b:4a 22 (22–25), 4a:g 37 (35–40), g:g 10 (10–13), g:ps3 22 (20–22), ps3:ps3 23 (17–23), ps3:h3 47 (47–52).

Femora I, II with ventral crest. Solenidion σ 1 I longer than genu I and situated at midlevel of this segment ( Fig. 30 B, C). Solenidion σ of genu III situated at midlevel of this segment. Legs IV slightly thicker than legs III, with ambulacral discs extending beyond margins of terminal lamellae. Tarsus IV 33 (30–37) in length; apicoventral process spatuliform, with oblique distal margin with seta w at base; modified setae d and e button-like, both situated in distal half of this segment ( Fig. 30 D, E). Seta d of tarsus II longer than corresponding seta f; seta d of tarsus III shorter than corresponding seta f. Length of solenidia: σ 1 I 32 (30–28), σ III 17 (17–20), φ IV 35 (32–35).

FEMALE (range for 10 paratypes). Idiosoma, length × width, 370–390 × 140–155, length of hysterosoma 255–275. Prodorsal shield: anterolateral extensions acute, lateral margins with lateral incisions extending to bases of setae se, surface without ornamentation, 85–95 in length and 95–100 in width. Setae se separated by 70–75.

Setae c2 and cp on humeral shields. Setae c3 lanceolate, 17–20 × 4–5 in width. Distance between prodorsal and hysteronotal shields 25–30. Anterior hysteronotal shield: 185–200 in length and 85–95 in width, anterior margin concave, posterior with short and widely rounded median extension (posterior margin slightly convex), surface without ornamentation ( Fig. 29 A). Lobar region: 80–90 in length and 95–105 in width, lateral margins convex, with noticeable extensions bearing setae h2; lobar shield entire, its anterior margin medially convex. Terminal cleft narrow, almost parallel-sided, slightly enlarged in posterior quarter, 55–62 in length, 6–10 in width in anterior part. Supranal concavity absent. Setae h2 lanceolate in basal part and with filiform apex, 80–95 in length, 6–7 in width; setae h3 46–50 in length, approximately 1/3 of terminal appendages. Setae h1 inserted on striated tegument between anterior hysteronotal and lobar shields. Setae h1 and f2 arranged in low trapezium. Setae ps1 on inner margins of opisthosomal lobes, close to level of setae h3. Distance between dorsal setae: c2:d2 79–75, d2:e2 95– 105, e2:h 2 30–35, h2:h3 46–52, h1:h 2 17–20, d1:d 2 22–32, e1: e2 35–45, h1:h 1 30–32, h2:h2 80–90, h2:ps 1 30– 38.

Epimerites I, II as in male, without surface fields. Epimerites IVa large, with long and heavily sclerotized posterior extension ( Fig. 29 B). Epigynum horseshoe-shaped, thin, with acute tips extending to level of genital papillae, 45–50 in length, 58–60 in width. Genital papillae of each side on small ovate plate. Setae ps2 at midlevel of anal opening. Translobar apodemes not fused to each other anterior to terminal cleft. Copulatory opening ventral, situated near anterior end of terminal cleft. Head of spermatheca cone-shaped; proximal half of primary spermaduct monotonously enlarged to head of spermatheca; secondary spermaducts 50–52 long ( Fig. 30 F). Distance between pseudanal setae, ps2:ps2 42–50, ps3:ps 3 17–24, ps2:ps 3 10–13.

Legs I, II as in male. Legs IV with ambulacral disc extending to level of setae h2. Solenidion σ1 of genu I slightly longer than this segment and situated slightly closer to its base. Solenidion σ of genu III in proximal half of this segment. Solenidion φ of tibia IV approximately half the length of corresponding tarsus. Setae d of tarsi II–IV longer than corresponding setae f. Length of solenidia: σ 1 I 32–35, σ III 22–25, φ III 38 –50, φ IV 18–23.

Differential diagnosis. Among previously described species, Nycteridocaulus platyrinchi sp. n. is most similar to N. lamellus in having very short opisthosomal lobes and semicircular terminal lamellae with radial striation in males, and the prodorsal shield with deep lateral incisions in females. Nycteridocaulus platyrinchi differs from N. lamellus by the following features: in males, the adanal shields are represented by two pairs of sclerites (small anterolateral and large posteromedial pairs), the bases of setae h2 are situated on semi-ovate lateral extensions of opisthosomal lobes, setae ps2 and f2 are situated submarginally; setae ps3 are situated on the anterior margins of the posteromedial adanal sclerites, setae h1 are situated between the transverse levels of setae h2 and h3, and epimerites IVa are present; in females, the lobar region is slightly wider than long (1.1–1.2 times), the terminal cleft is narrow (4–5 times longer than wide) and setae h2 are shorter than the terminal appendages.

In males of N. lamellus , the adanal shields are represented by one pair of roughly triangular sclerites, the bases of setae h2 are situated on the slightly convex lateral margins of the opisthosomal lobes, setae ps2 and f2 are situated marginally; setae ps3 are situated off the adanal shields, setae h1 are situated far anterior to the levels of setae h2, and epimerites IVa are absent; in females, the lobar region is 2 times wider than long, and the terminal cleft is U-shaped (slightly wider than long), and setae h2 are whip-shaped, distinctly longer than the terminal appendages.

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

Figures

FIGURE 28. Nycteridocaulus platyrinchi Mironov sp. n., male. A—dorsal view, B—ventral view.

FIGURE 29. Nycteridocaulus platyrinchi Mironov sp. n., female. A—dorsal view, B—ventral view.

FIGURE 30. Nycteridocaulus platyrinchi Mironov sp. n., details. A—opisthosoma of male, ventral view, B – D—legs I, II and IV of male, dorsal view, E—tibia and tarsus IV of male, ventral view, F—spermatheca and spermaducts.