Nycteridocaulus myioborus 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 : 45-49

Nycteridocaulus myioborus Mironov sp. n.

( Figs. 22–24 )

Type material. Male holotype ( ZISP 6616 ), 4 male and 5 female paratypes from Myioborus miniatus (Swainson, 1827) ( Parulidae ), COSTA RICA, Tapantí National Park , Sector Tapantí, Cordillera de Talamanca Mts., 09°46’N, 83°47’W, 11 August 2009, collectors I. Literak, O. Sychra and M. Capek.

Depository. Holotype, 2 male and 3 female paratypes (ZISP 6616–6621)—ZISP; 1 male, 1 female paratype— UMMZ (BMOC-15-1028-010), 1 male, 1 female paratype—IMUCR.

Description. MALE (holotype, range for 4 paratypes in parentheses). Idiosoma, length × width, 285 (280– 300) × 160 (160–180), length of hysterosoma 180 (175–195). Prodorsal shield: anterolateral extensions acute, lateral margins entire, posterior margin almost straight, 92 (90–95) in length and 110 (105–120) in width, surface without ornamentation ( Fig. 22 A). Setae ve rudimentary. Scapular setae se separated by 70 (70–75). Setae c2 and cp on humeral shield. Setae c3 lanceolate, 16 (16–20) × 4 (4–5). Distance between prodorsal and hysteronotal shields 22 (18–25). Hysteronotal shield: 175 (170–180) in length and 105 (100–110) in width; anterior margin slightly concave, surface with minute sparsely distributed lacunae. Opisthosoma slightly attenuate posteriorly. Opisthosomal lobes short, roughly rectangular, posterior margin oblique; terminal lamellae short rectangular, 8 (7– 8) in length and 15 (15–18) in width. Terminal cleft small triangular, with anterior end extending to level of setae h2, 12 (8–12) in length, 14 (12–16) 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 opisthosomal 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 65 (60–68), d2:e2 70 (70–78), e2:h3 40 (37–42), h2:h2 68 (68–74), h3:h3 50 (50–55), ps2:ps2 75 (75–80), h1:h3 30 (27–30), d1:d2 15 (15–18), e1: e2 28 (28–30).

Epimerites I free, well separated from each other, posterior tips slightly divergent; epimerites I, II with narrow sclerotized fields; epimerites IVa absent ( Fig. 22 B). Rudimentary sclerite rEpIIa absent. Trochanters III flanked by sclerotized band connecting bases of epimerites III and IIIa. Epimerites IIIa narrow, with acute inner tips.

Trochanters IV flanked by sclerotized bands going from bases of epimerites III. Genital apparatus situated at level of trochanters IV. Genital arch shaped as recurved bow, 13 (13–15) in length and 42 (42–45) in width. Aedeagus stylet-like, 20 (20–22) in length, reaching level of setae g ( Fig. 24 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 (88–93). Pregenital apodemes absent. Setae 4a and 4b on soft tegument. Anal suckers 15 (13–16) in diameter, corolla with 7–8 denticles. Adanal shields represented by two pairs of sclerites: anterolateral sclerites circular, poorly sclerotized; posteromedial sclerites roughly triangular (in some specimens, sclerites of each side weakly connected). Setae ps3 situated on posteromedial sclerites of adanal shields. Opisthoventral shields shaped as roughly triangular extensions at level of anal opening. Distance between ventral setae: 3a:4b 13 (13–15), 4b:4a 25 (25–28), 4a:g 33 (32–35), g:g 15 (13–15), g:ps3 23 (22–25), ps3:ps3 18 (15–18), ps3:h3 45 (42–50).

Femora I, II with narrow ventral crest. Solenidion σ 1 I slightly longer than genu I and situated at midlevel of this segment ( Fig. 24 B, C). Solenidion σ of genu III situated at midlevel of this segment. Legs III, IV subequal in size, legs IV with ambulacral discs slightly extending beyond level of lobar apices. Tarsus IV 25 (22–25) in length, with apicoventral spine-like process bearing seta w; modified setae d and e button-like, seta d situated closer to base than to apex of tarsus ( Fig. 24 D). Setae d and f of tarsi II, III subequal in length. Length of solenidia: σ 1 I 33 (30–35), σ III 20 (18–20), φ IV 25 (23–25).

FEMALE (range for 5 paratypes). Idiosoma, length × width, 400–415 × 185–195, length of hysterosoma 280–285. Prodorsal shield: shaped as in male, 105–110 in length and 135–140 in width, surface with minute circular lacunae. Setae se separated by 85–90. Setae c2 and cp on humeral shields. Setae c3 lanceolate, 20–22 × 5– 6 in width. Distance between prodorsal and hysteronotal shields 25–30. Anterior hysteronotal shield: 195–200 in length and 120–130 in width, anterior margin slightly concave, posterior margin with small semi-rounded median extension, entire surface with numerous small circular lacunae, these lacunae noticeably larger near posterior end of this shield ( Fig. 23 A). Lobar region: 80–85 in length and 95–100 in width, lateral margins strongly convex; lobar shield entire, anterior margin with pair of deep narrow incisions and small truncate extension between them. Terminal cleft narrow, lateral margins slightly convex, 55–60 in length, 10–12 in width in anterior part. Supranal concavity absent. Setae h2 lanceolate in basal part and with long filiform apex, 95–115 in length, 7–8 in width; setae h3 75–85 in length, about 2/3 of terminal appendages. Setae h1 inserted on striated tegument between the 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 85–90, d2:e2 105–110, e2:h2 45–50, h2:h 3 26–30, h1:h2 42–48, d1:d 2 25–28, e1: e2 46–50, h1:h 1 22–25, h2:h2 75–80, h2:ps 1 20–22.

Epimerites I, II as in male, with narrow sclerotized fields. Epimerites IVa large, roughly triangular with concave anterior margin ( Fig. 23 B). Epigynum horseshoe-shaped, thick, with acute tips extending to level of setae g, 45–50 in length, 66–78 in width. Genital papillae of each side and corresponding seta g on small longitudinal plate. Setae ps2 at midlevel of anal opening. Translobar apodemes not fused to each other anterior to terminal cleft. Copulatory opening ventral, situated near to anterior end of terminal cleft. Head of spermatheca short; proximal part of primary spermaduct with ampuliform enlargement about 30 long; secondary spermaducts 30–35 long ( Fig. 24 E). Distance between pseudanal setae, ps2:ps2 45–48, ps3:ps 3 18–22, ps2:ps 3 14–16.

Legs I, II as in 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 slightly closer to its base. Solenidion σ of genu III in proximal half of this segment. Solenidion φ of tibia IV slightly shorter than corresponding tarsus. Seta d of tarsus II longer than corresponding seta f, setae d and f of tarsi III, IV subequal in length. Length of solenidia: σ 1 I 32–38, σ III 37–30, φ III 50 –54, φ IV 32 –34.

Differential diagnosis. The new species, Nycteridocaulus myioborus sp. n., is very similar to N. guaratubensis Hernandes, 2014 in having short opisthosomal lobes with nearly rectangular terminal lamellae in males. The new species differs from the latter species by the features as follows: in males of N. myioborus , the antero-lateral pieces of the adanal shields are circular, free or connected by thin commissures to corresponding postero-mesal pieces; setae 4b are situated off the sclerotized fields of epimerites IIIa, and rudimentary sclerites rEpIIa are absent; in females, the incisions in the anterior margin of the lobar shield are slit-like. In males of N. guaratubensis , the adanal shields are entire, thick L-shaped, setae 4b are situated on sclerotized areas around the tips of epimerites IIIa, and rudimentary sclerites rEpIIa are present; in females, the incisions in the anterior margin of the lobar shield are triangular.

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

Remark. Nycteridocaulus myioborus is the only species of the genus Nycteridocaulus associated with oscine passerines of the family Parulidae .

Figures

FIGURE 22. Nycteridocaulus myioborus Mironov sp. n., male. A—dorsal view, B—ventral view.

FIGURE 23. Nycteridocaulus myioborus Mironov sp. n., female. A—dorsal view, B—ventral view.

FIGURE 24. Nycteridocaulus myioborus 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.