Amerodectes hribari, Mironov & Chandler, 2017

Mironov, Sergey V. & Chandler, C. Ray, 2017, New feather mites of the genus Amerodectes Valim and Hernandes (Acariformes: Proctophyllodidae) from passerines (Aves: Passeriformes) in Georgia, USA, Zootaxa 4344 (2), pp. 201-245 : 217-222

Amerodectes hribari sp. n.

( Figs. 7–9 )

Amerodectes sp., Hribar & Miller 2011: 138, fig. 1.

Type material. Male holotype ( BMOC 16-0825-021), 11 male and 26 female paratypes from Geothlypis trichas (Linnaeus, 1766) ( Passeriformes : Parulidae ), USA, Georgia, Statesboro, Georgia Southern University campus, 32°25'15"N, 81°47'22"W, 29 April 2014, coll. C.R. Chandler.

Type depository. Holotype, 5 male and 13 female paratypes—BMOC, 6 male and 13 female paratypes—ZISP. Additional material. 1 male and 1 female from Geothlypis trichas , USA, Florida, Monroe Key, Vaca Key , 5 October 2010, coll. L.J. Hribar.

Description. MALE (holotype, range for 1 paratypes in parentheses). Idiosoma, length × width, 350 (325– 350) × 135 (125–140), length of hysterosoma 230 (210–230). Prodorsal shield: entire, anterolateral extensions acute with subapical ledge, lateral margins concave at level of scapular setae, posterior margin straight, posterior angles widely rounded, in some individuals rough, surface without ornamentation, length 110 (100–110), width 100 (85–100) ( Fig. 7A ); Setae ve absent. Bases of scapular setae se separated by 47 (45–48). Scapular shields narrow, not developed dorsally. Humeral shields absent. Setae cp and c2 situated on striated tegument. Subhumeral setae c3 lanceolate, 25 (22–25) × 7 (7–8). Hysteronotal shield: anterior margin straight, surface without ornamentation, greatest length 230 (210–230), width at anterior margin 95 (85–95). Distance between prodorsal and hysteronotal shields about 15. Opisthosomal lobes slightly shorter than wide at base; posterior margins of lobes roughly rounded, with small truncate extensions at bases of setae h2 and h3. Terminal cleft shaped as trapezium or a U with widely divergent branches, 22 (21–24) long. Supranal concavity semicircular. Setae f2 anterior to bases of setae ps2. Setae h1 situated at level of supranal concavity. Setae h3 spiculiform, 18 (17–20) long; setae ps2 80 (70– 80) long. Setae ps1 filiform, about 10 long, situated near margins of terminal cleft slightly anterior to level of setae ps2. Distances between dorsal setae: c2:d2 92 (87–95), d2:e2 85 (77–85), e2:h3 42 (42–45), d1:d2 37 (34–38), e1: e2 25 (25–30), h1:ps2 20 (19–22), h2:h2 52 (45–52), h3:h3 40 (40–48), ps2:ps2 65 (60–65).

Epimerites I fused into a Y with very short stem, fused part with three small acute extensions, median and a pair of lateral ones (poorly expressed in some specimens) ( Fig. 7B ). Coxal fields I, II without extensively sclerotized areas. Rudimentary sclerites rEpIIa absent. Coxal fields I–III open. Coxal fields IV without sclerotized areas at bases of trochanters IV. Epimerites IIIa with small acute extensions on inner margins. Epimerites IVa barely distinct. Genital arch of moderate size, 24 (22–24) × 45 (40–45); aedeagus sword-shaped, 97 (90–98) long, extending to anterior end of terminal cleft; basal sclerite shaped as transverse ovoid ( Fig. 9A ). Genital papillae connected at bases. Genital and adanal shields absent. Adanal suckers 15 (14–15) in diameter, corolla smooth, surrounding membrane with radial striae. Opisthoventral shields occupying lateral areas of opisthosoma and distal half of opisthosomal lobes; inner margins of these shields at level of anal suckers with roughly trapezoidal extensions bearing setae ps3. Setae 4b situated distinctly posterior to level of setae 3a; setae ps3 at level of posterior margin of adanal suckers. Distance between ventral setae: 4b: 3a 10 (7–10), 4b:4a 42 (40–42), 4a:g 40 (35–40), g:ps3 57 (50–58), ps3:ps3 55 (52–58), ps3:h3 27 (25–28).

Femora I, II with narrow ventral crests, other segments of legs I, II without processes ( Figs. 9B, C ). Solenidion σ1 of genu I approximately half as long as this segment and situated at its midlevel. Genual setae cG I, II and mG I filiform, setae mG II slightly thickened basally. Setae d of tarsi II, III much shorter than corresponding setae f. Solenidion φ of tibia IV extending to midlevel of ambulacral disc. Tarsus IV 23 (20–23) long, with apical process; seta d at midlength of segment ( Fig. 9D ). Length of solenidia: ω 1 I 13 (13–15), ω 1 II 10 (10–11), σ 1 I 17 (13–17) σ III 10 (9–11), φ IV 25 (22–26).

FEMALE (range for 10 paratypes). Idiosoma, length × width, 455–495 × 125–145, length of hysterosoma 310–345. Prodorsal shield: shaped as in male, 120–135 × 105–115, surface without ornamentation or with few scarcely distinct lacunae. Setae ve absent. Bases of setae se separated by 57–62. Scapular shields narrow, not developed dorsally. Humeral shields absent. Setae cp and c2 situated on striated tegument. Setae c3 lanceolate, 20– 23 × 5–6. Anterior and lobar parts of hysteronotal shield separated dorsally by narrow transverse band of soft tegument ( Fig. 8A ). Anterior hysteronotal shield: noticeably attenuate to posterior end, anterior margin straight, surface without lacunae, greatest length 235–255, width at anterior margin 105–120. Length of lobar region 87–93, greatest width 70–75. Terminal cleft narrow, with lateral margins almost touching and slightly divergent posteriorly, 62–68 long. Lobar shield split longitudinally into two large pieces covering opisthosomal lobes and small rounded sclerite between their anterior ends; surface of pieces covering lobes with 1-2 pairs of ovate lacunae near anterior margin. Supranal concavity situated on small median sclerite between the main pieces of lobar shield and poorly delineated. Setae h1 at level of supranal concavity; setae h1 and f2 arranged in a low trapezium. Setae h2 spindle-like, 35–38 × 5–6. Setae ps1 situated near inner margins of opisthosomal lobes, closer to lobar apices than to level of setae h2. Setae h 3 10–13 long, about 1/6th the length of terminal appendages. Distances between dorsal setae: c2:d2 105–115, d2:e2 92–105, e2:h2 50–55, h2:h3 50–53, d1:d2 50–58, e1: e 2 30–33, h1:h 2 20–23, h1:h 1 30–33, h2:h2 57–62, h2:ps 1 25–28.

Epimerites I fused into a Y with very short stem ( Fig. 8B ). Lateral parts of coxal fields I, II without large sclerotized areas. Epimerites IVa absent. Translobar apodemes of opisthosomal lobes present, not fused to each other anterior to terminal cleft. Epigynum without lateral extensions, greatest width 47–53; apodemes of oviporus fused with epimerites IIIa. Pseudanal setae filiform, setae ps2 situated at level of posterior margin of anal opening and widely separated from each other; distance between pseudanal setae: ps2:ps 2 30–32, ps3:ps 3 15–18, ps2:ps 3 27–32. Primary spermaduct with slightly enlarged piece in proximal half; continuation of primary spermaduct in spermatheca narrowly ampuliform, with strongly sclerotized wall; secondary spermaducts about 20 long ( Fig. 9E ).

Femora I, II with ventral crest, other segments of legs I, II without processes. Solenidion σ1 of genu I slightly longer than half the length of this segment and situated at its midlevel. Genual setae cG I, II, mG I, II as in male. Setae d of tarsi II–IV much shorter than corresponding setae f. Genu IV dorsally inflated, with narrow dorsal crest. Lengths of solenidia: ω 1 I 12–15, ω 1 II 11–12, σ 1 I 13–15, σ 1 II 7.5–10, φ III 15–20, φ IV 7–8.

Differential diagnosis. Amerodectes hribari sp. n. is most similar to A. contopus Mironov and González- Acuña, 2011 described from Contopus virens (Linnaeus) ( Tyrannidae ) in Cuba ( Mironov & González-Acuña 2011). In males of both species, the aedeagus extends to the anterior end of the terminal cleft, setae h3 are about 20 µm long and distinctly shorter than the distance between their bases, the genital papillae are connected at bases, and the fused part of epimerites I has three short acute extensions. Amerodectes hribari differs from that species by the following features: in both sexes, the prodorsal shield lacks any lacunae; in males, sclerotized areas on inner tips of epimerites IIIa have small tooth like extension directed backward, and setae h1 are situated at the level of the supranal concavity; in females, the lobar shield is completely split into two lobar pieces, bearing 1-2 lacunae, and a small median fragment, the anterior hysteronotal shield lacks any ornamentation, setae h1 are situated at the level of the median fragment of the lobar shield. In both sexes of A. contopus , the prodorsal shield is almost completely covered with small circular lacunae; in males, the sclerotized areas on tips of epimerites IIIa are without a backwards-directed indentation, and setae h1 are situated at the level of the anterior end of the terminal cleft; in females, the lobar shield is entire and lacks lacunae, the anterior hysteronotal shield bears small circular lacunae in the posterior half, setae h1 are situated at the level of the anterior end of the terminal cleft.

Amerodectes hribari also resembles A. geothlypis ( Berla, 1973) described from Geothlypis aequinoctialis velata (Vieillot) (Parulidae) in Brazil ( Berla 1973; Valim & Hernandes 2006) in having a few circular lacunae in the anterior part of the lobar shield in females and lacking of ornamentation on the hysteronotal shield in both sexes. However, the new species clearly differs from A. geothlypis in these ways: in males, the aedeagus extending to the anterior end of terminal cleft (vs. extending to the midlevel of anal opening in A. geothlypis ), setae h3 distinctly shorter than the distance between their bases (vs. equal to the distance between them); in females, setae h1 are minute filiform (vs. short spiculiform), setae h3 are about 1/6th the length of appendages (vs. about 1/3rd of their length), the lobar shield is split into two lateral pieces and minute median sclerite (vs. entire shield), and setae h1 and f2 are arranged in trapezium (vs. arranged in a transverse line).

Etymology. This species is named after Dr. L. J. Hribar (Florida Keys Mosquito Control District, Marathon, FL, USA), who first collected this mite on Geothlypis trichas in the USA.

Figures

FIGURE 7. Amerodectes hribari sp. n., male. A—dorsal view, B—ventral view.

FIGURE 8. Amerodectes hribari sp. n., female. A—dorsal view, B—ventral view.

FIGURE 9. Amerodectes hribari sp. n., details. A—opisthosoma of male, ventral view, B, C—legs I, II of male, respectively, D—tibia and tarsus IV of male, E—spermatheca and spermaducts.