Nycteridocaulus hylophylax 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 : 49-53

Nycteridocaulus hylophylax Mironov sp. n.

( Figs. 25–27 )

Type material. Male holotype ( ZISP 6336 ), 1 male and 4 female paratypes from Hylophylax naevioides (Lafresnaye, 1847) ( Thamnophilidae ), 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.

Depositories: Holotype and 3 female paratypes (ZISP 6334–6339)—ZISP, 1 male and 1 female paratype— IMUCR.

Description. MALE (holotype, measurements for a single paratype in parentheses). Idiosoma, length × width, 290 (300) × 150 (160), length of hysterosoma 190 (185). Prodorsal shield: anterolateral extensions widely rounded, lateral margins entire, posterior margin with very short and wide median extension, 95 (100) in length and 110 (115) in width, surface with numerous circular lacunae up to 5 in diameter ( Fig. 25 A). Setae ve rudimentary. Scapular setae se separated by 67 (70). Setae c2 and cp on humeral shield. Setae c3 lanceolate, 18 (17) × 5 (6). Distance between prodorsal and hysteronotal shields 15 (17). Hysteronotal shield: 185 (190) in length and 105 (110) in width; anterior margin slightly concave medially, surface with numerous circular lacunae as on prodorsal shield. Opisthosoma slightly attenuate posteriorly. Opisthosomal lobes short and wide, with slightly oblique posterior margin and with short postero-lateral angle forming lobar apex and bearing setae h3. Terminal lamellae rounded, almost semicircular, 10 (10) in length and 18 (20) in width at base. Terminal cleft small, triangular, with anterior end extending to level of setae h2, 12 (13) in length, 24 (25) in width at level of setae ps1. Supranal concavity present, ovate. Setae h2 situated on small semiovate lateral extensions of opisthosomal lobes; setae ps 1 in posteromedial margins of lobes, at the same level with setae h3; setae h1 situated slightly anterior to setae ps2. Distance between dorsal setae: c2:d2 95 (100), d2:e2 78 (75), e2:h3 35 (40), h2:h2 73 (75), h3:h3 58 (56), ps2:ps2 73 (75), h1:h3 22 (23), d1:d2 23 (24), e1: e2 27 (28).

Epimerites I free, close to each other, posterior tips slightly divergent; epimerites I, II with narrow sclerotized fields; epimerites IVa absent ( Fig. 25 B). Rudimentary sclerite rEpIIa present. Trochanters III flanked by sclerotized band connecting bases of epimerites III and IIIa. Epimerites IIIa with sclerotized plates around their inner tips. Trochanters IV flanked by sclerotized bands going from bases of epimerites III. Genital apparatus situated posterior to midlevel of trochanters IV. Genital arch bow-shaped, 18 (17) in length and 35 (37) in width. Minute sclerites situated lateral to tips of genital arch. Aedeagus stylet-like, 25 (24) in length, reaching level of setae g ( Fig. 27 A). Genital papillae on small oval plates at level of genital arch apex. Distance from genital arch apex to bases of setae h3 93 (95). Pregenital apodemes absent. Setae 4a on soft tegument, setae 4b on posterior extensions of sclerotized areas of epimerites IIIa or on soft tegument near them. Adanal suckers 14 (15) in diameter, corolla with 7–8 denticles. Adanal shields represented by two pairs: antero-lateral pair represented by narrow oblique sclerites, and posteromedial pair roughly ovate and bearing setae ps3. Opisthoventral shields shaped as narrow oblique sclerites. Distance between ventral setae: 3a:4b 13 (15), 4b:4a 27 (28), 4a:g 33 (35), g:g 24 (23), g:ps3 50 (48), ps3:ps3 18 (20), ps3:h3 44 (46).

Femora I, II with ventral crest. Solenidion σ 1 I longer than genu I and situated at midlevel of this segment ( Fig. 25 A, B). 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 terminal membrane. Tarsus IV 22 (21) in length, without apicoventral clawlike process; modified setae d and e button-like, situated in distal half of this segment, seta e with minute nipple ( Fig. 27 D). Seta d of tarsus II longer than corresponding seta f, setae d and f of tarsi III subequal in length. Length of solenidia: σ 1 I 25 (26), σ III 10 (12), φ IV 35 (37).

FEMALE (range for 4 paratypes). Idiosoma, length × width, 405–430 × 170–180, length of hysterosoma 300– 305. Prodorsal shield: form and ornamentation as in male, 105–110 in length and 130–135 in width. Setae se separated by 85–90. Setae c2 and cp on humeral shields. Setae c3 lanceolate, 15–18 × 5–6 in width. Distance between prodorsal and hysteronotal shields 10–15. Anterior hysteronotal shield: 205–210 in length and 125–130 in width, anterior margin almost straight, posterior margin with short and widely rounded median extension and a pair of shallow concavities, entire surface with numerous circular lacunae, about 5 in diameter ( Fig. 26 A). Lobar region: 92–100 in length and 110–115 in width, lateral margins slightly convex, with short extensions bearing setae h2; lobar shield entire, anterior margin slightly concave. Terminal cleft large nearly rectangular, 67–73 in length, 40–45 in width. Supranal concavity absent. Setae h2 lanceolate in basal part and with filiform apex, 70–80 in length, 5–6 in width; setae h3 42–48 long, about 1/3 of terminal appendages. Setae h1 inserted on striated tegument between parts of hysteronotal shields or on posterior margin of anterior hysteronotal shield. Setae h1 and f 2 in trapezoidal arrangement. Setae ps1 on inner margins of opisthosomal lobes, closer to level of setae h3. Distance between dorsal setae: c2:d2 78–85, d2:e2 115–120, e2:h2 40–48, h2:h3 50–52, h1:h2 35–40, d1:d 2 26–30, e1: e2 47–52, h1:h 1 30–35, h2:h2 100–105, h2:ps 1 25–27.

Epimerites I, II as in male, with narrow surface fields. Epimerites IVa large, with long posterior extensions ( Fig. 26 B). Trochanters III and IV flanked by narrow sclerotized bands connecting corresponding epimerites III and IV. Epigynum semicircular, thick, with acute tips extending to level of genital papillae, 37–40 in length, 68–75 in width. Genital papillae of each side on small ovate sclerotized 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 and covered with posterior ends of anal folds. Head of spermatheca short; proximal part of primary spermaduct with enlargement 25 long, secondary spermaducts 28–30 long ( Fig. 27 F). Distance between pseudanal setae: ps2:ps2 58–60, ps3:ps 3 20–22, ps2:ps 3 8–10.

Legs I, II as male. Legs IV with distal margin of ambulacral disc extending to level of setae f2. 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 slightly shorter than corresponding tarsus. Seta d of tarsus II longer than corresponding seta f, setae d of tarsi III, IV shorter than corresponding setae f. Length of solenidia: σ 1 I 30–32, σ III 12–14, φ III 37 –40, φ IV 20–22.

Differential diagnosis. The new species Nycteridocaulus hylophylax sp. n. is most similar to N. lamellus Atyeo, 1966 , described from Myiarchus crinitus (Linnaeus) from Texas, in having short and rounded terminal lamellae in males and a wide terminal cleft in females. Nycteridocaulus hylophylax sp. n. is readily differentiated from this species by the following features: in both sexes, the prodorsal and hysteronotal shields are entirely covered with large circular lacunae; in the male, the genital arch is relatively long and nearly semicircular in shape, the adanal shields are represented by two well-separated pairs of sclerites (antero-lateral and postero-mesal pairs), and setae ps3 are situated on the sclerites of the postero-mesal pair; in the female, the lobar shield is entire, and the terminal cleft is large and rectangular, 40–45 µm in width ( Fig. 26 A). In both sexes of N. lamellus , the prodorsal and hysteronotal shields lack ornamentation; in males, the genital arch is low and shaped as a recurved bow, the adanal shields are represented by the postero-mesal pair, and setae ps3 are situated off the adanal shields; in females, the lobar shield is split longitudinally and the terminal cleft is trapezoidal, with its greatest width about 25 µm.

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

Figures

FIGURE 25. Nycteridocaulus hylophylax Mironov sp. n., male. A—dorsal view, B—ventral view.

FIGURE 26. Nycteridocaulus hylophylax Mironov sp. n., female. A—dorsal view, B—ventral view.

FIGURE 27. Nycteridocaulus hylophylax 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.