Nycteridocaulus myiobius 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 : 41-45

Nycteridocaulus myiobius Mironov sp. n.

( Figs. 19–21 )

Type material. Male holotype ( ZISP 6 148), 8 male and 12 female paratypes from Myiobius sulphureipygius (Sclater, PL, 1857) ( Tyrannidae ), COSTA RICA, Rincón de la Vieja National Park , Cordillera de Guanacaste Mts., 10°46'N, 85°18'W, 24 August 2009, collectors I. Literak, O. Sychra and M. Capek.

Depository. Holotype, 6 male and 8 female paratypes (ZISP 6149–6165)—ZISP; 1 male and 1 female paratype—UMMZ (BMOC-15-1028-015), 1 male and 1 female paratype—IMUCR.

Description. MALE (holotype, range for 8 paratypes in parentheses). Idiosoma, length × width, 295 (290– 310) × 140 (140–150), length of hysterosoma 195 (190–200). Prodorsal shield: anterolateral extensions with rounded tips, lateral margins entire, posterior margin straight, 100 (95–105) in length and 100 (100–110) in width, entire surface with numerous circular lacunae up to 10 in diameter ( Fig. 19 A). Setae ve rudimentary. Scapular setae se separated by 65 (65–75). Setae c2 and cp on humeral shields. Setae c3 lanceolate, 18 (17–19) × 4 (4–5). Distance between prodorsal and hysteronotal shields 10 (10–15). Hysteronotal shield: 190 (190–200) in length and 110 (105–115) in width; anterior margin slightly concave, surface with numerous circular lacunae as on prodorsal shield. Opisthosoma slightly attenuate posteriorly. Opisthosomal lobes short, roughly rectangular, posterior margin almost straight; terminal lamellae short rectangular, 11 (10–11) in length and 15 (15–18) in width. Terminal cleft small triangular, with anterior end extending to level of setae h2, 15 (15–17) in length, 11 (10–13) in width at level of setae ps1. Supranal concavity present, narrowed posteriorly. Setae h2 situated on truncate lateral extensions of opisthosomal lobes; setae h3 situated in posterolateral angles of lobes; setae ps 1 in posteromedial angles of lobes, slightly anterior to level of setae h3; setae h1 situated slightly anterior to setae ps2. Distance between dorsal setae: c2:d2 72 (70–75), d2:e2 65 (65–70), e2:h3 50 (50–60), h2:h2 65 (65–70), h3:h3 48 (48–55), ps2:ps2 72 (72–78), h1:h3 37 (30–38), d1:d2 22 (18–22), e1: e2 28 (23–28).

Epimerites I free, close to each other, posterior tips divergent; epimerites I, II with narrow surface fields; epimerites IVa absent ( Fig. 19 B). Rudimentary sclerite rEpIIa present. Trochanters III flanked by sclerotized bands going from bases of epimerites IIIa. Epimerites IIIa wide, with sclerotized areas around their inner tips with acute anterior extensions almost touching at midline and with short posterior extensions. Trochanters IV flanked by sclerotized bands stretching from bases of epimerites IV. Genital apparatus situated slightly posterior to level of trochanters IV. Genital arch shaped as recurved bow, 10 (9–11) in length and 38 (38–42) in width. Aedeagus styletlike, 18 (15–18) in length, reaching level of setae g ( Fig. 21 A). Genital papillae of each side on small oval plates at level of genital arch apex. Distance from genital arch apex to bases of setae h3 88 (85–92). Pregenital apodemes absent. Setae 4a on soft tegument, setae 4b on sclerotized areas of epimerites IIIa. Adanal suckers 15 (15–16) in diameter, corolla with 9 denticles. Adanal shields represented by a pair of roughly L-shaped sclerites situated anterior to anal suckers. Setae ps3 situated on transverse branches of adanal shields. Opisthoventral shields shaped as small roughly triangular extensions at level of anal opening. Distance between ventral setae: 3a:4b 10 (10–13), 4b:4a 30 (30–33), 4a:g 33 (32–35), g:g 11 (11–12), g:ps3 25 (25–28), ps3:ps3 25 (25–28), ps3:h3 48 (45–50).

Femora I, II with ventral crest. Solenidion σ1 of genu I slightly longer than this segment and situated at its midlevel ( Fig. 21 B, C). Solenidion σ of genu III situated at midlevel of this segment. Legs III, IV subequal in size, legs IV with ambulacral discs extending to level of setae h3. Tarsus IV 20 (20–24) in length, with apicoventral spine-like process bearing seta w; modified setae d and e button-like, both situated in distal half of this segment ( Fig. 21 D). Seta d of tarsus II longer than corresponding seta f; setae d of tarsus III shorter than corresponding seta f. Length of solenidia: σ 1 I 28 (25–28), σ III 15 (12–15), φ IV 30 (30–35).

FEMALE (range for 10 paratypes). Idiosoma, length × width, 390–420 × 165–185, length of hysterosoma 280–300. Prodorsal shield: form and ornamentation as in male, 105–120 in length and 130–140 in width. Setae se separated by 86–92. Setae c2 and cp on humeral shields. Setae c3 lanceolate, 20–22 × 4–5. Distance between prodorsal and hysteronotal shields 8–10. Anterior hysteronotal shield: 195–205 in length and 125–145 in width, anterior margin almost straight, posterior margin with small rounded median extension and a pair of shallow concavities, entire surface with numerous circular lacunae; in posterior part these lacunae noticeably larger, up to 10 in diameter ( Fig. 20 A). Lobar region: 90–95 in length and 90–98 in width, lateral margins strongly convex, without noticeable extensions bearing setae h2; lobar shield entire, its anterior margin concave, with small median extension. Terminal cleft narrow, almost parallel-sided, 55–64 in length, 12–17 in width at midlevel. Supranal concavity absent. Setae h2 lanceolate without filiform apex, 50–55 in length, 7–8 in width; setae h3 70–75 in length, approximately half the length of terminal appendages. Setae h1 inserted on striated tegument between anterior hysteronotal and lobar shields. Setae h1 and f 2 in trapezoidal arrangement. Setae ps1 on inner margins of opisthosomal lobes, close to level of setae h3. Distance between dorsal setae: c2:d2 86–95, d2:e2 105–115, e2:h2 37–40, h2:h3 35–38, h1:h2 37–45, d1:d 2 25–34, e1: e2 52–55, h1:h 1 22–25, h2:h2 72–78, h2:ps 1 25–30. \ Epimerites I as in male; epimerites I, II with narrow surface fields. Epimerites IVa large, roughly triangular, with heavily sclerotized posterior extension ( Fig. 20 B). Epigynum horseshoe-shaped, thick, lateral margins with blunt-angular extensions, tips acute extending beyond level of setae g, 47–55 in length, 75–85 in width. Genital papillae of each side on small ovate sclerotized plate. Setae ps2 situated 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 short; primary spermaduct without enlargement; secondary spermaducts 35–38 long ( Fig. 21 F). Distance between pseudanal setae, ps2:ps2 47–50, ps3:ps 3 21–25, ps2:ps 3 13–15.

Legs I, II as male. Legs IV with distal margin of ambulacral disc extending to level of setae h2. Solenidion σ1 of genu I slightly longer than this segment and situated at its midlevel. Solenidion σ of genu III in proximal half of this segment. Solenidion φ of tibia IV equal to corresponding tarsus. Seta d of tarsus II longer than corresponding seta f, setae d of tarsi III, IV slightly shorter than corresponding setae f. Length of solenidia: σ 1 I 30–35, σ III 15–18, φ III 52 –55, φ IV 37 –40.

Differential diagnosis. The new species Nycteridocaulus myiobius sp. n. is close to N. guaratubensis Hernandes, 2014 from Phylloscartes kronei Willis and Oniki (Tyrannidae) in having short opisthosomal lobes with nearly rectangular terminal lamellae in males, and the lobar shield with a small median extension on the anterior margin in females. Nycteridocaulus myiobius differs from N. guaratubensis by the following features: in both sexes, the prodorsal and anterior hysteronotal shields are covered with numerous circular lacunae; in males, the antero-lateral and postero-mesal parts of the adanal shields are connected by a very thin commissure; in females, the hysteronotal shield is wider (120–130 µm) and setae h3 are 75–85 µm long, about 2/3 the length of the terminal appendages. In both sexes of N. guaratubensis , the prodorsal shield lacks ornamentation, the anterior hysteronotal shields bears minute and sparsely distributed circular lacunae; in males, the adanal shields are thick L-shaped; in females, the hysteronotal shield is 100–108 µm wide and setae h3 are 66–72 µm long, about ½ the length of terminal appendages.

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

Figures

FIGURE 19. Nycteridocaulus myiobius Mironov sp. n., male. A—dorsal view, B—ventral view.

FIGURE 20. Nycteridocaulus myiobius Mironov sp. n., female. A—dorsal view, B—ventral view.

FIGURE 21. Nycteridocaulus myiobius 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—tibia and tarsus IV of male, ventral view, F—spermatheca and spermaducts.