Amerodectes haemorhous, 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 : 234-238

Amerodectes haemorhous sp. n.

( Figs. 19–21 )

Type material. Male holotype ( BMOC 16-0825-025), 14 male and 14 female paratypes from Haemorhous mexicanus (Statius Müller PL, 1776) ( Passeriformes : Fringillidae ), USA, Georgia, Statesboro, Georgia Southern University campus, 32°25'15"N, 81°47'22"W, 5 November 2014, coll. C.R. Chandler.

Type depository. Holotype, 8 male and 8 female paratypes—BMOC, 6 male and 6 female paratypes—ZISP.

Description. MALE (holotype, range for 10 paratypes in parentheses). Idiosoma, length × width, 350 (330– 355) × 145 (125–145), length of hysterosoma 230 (210–230). Prodorsal shield: entire, anterolateral extensions acute with subapical ledge, lateral margins slightly concave at level of scapular setae, posterior margin straight, posterior angles nearly rectangular, surface without ornamentation, length 105 (100–110), width 110 (100–110) ( Fig. 19A ). Setae ve rudimentary, represented by alveoli. Bases of scapular setae se separated by 57 (55–60).

Scapular shields narrow, scarcely developed dorsally. Humeral shields represented by narrow longitudinal sclerites anterolateral to bases of setae cp. Bases of setae cp and c2 situated on striated tegument. Subhumeral setae c3 lanceolate, 18 (18–20) × 7.5 (5.5–7.5). Hysteronotal shield: anterior margin straight, surface usually without ornamentation, (barely distinct minute lacunae present in some specimens), greatest length 230 (215–230), width at anterior margin 102 (95–105). Distance between prodorsal and hysteronotal shields about 10–15. Opisthosomal lobes approximately as long as wide at base; posterior margins of lobes roughly rounded, with small and blunt extensions at bases of setae h2 and h3. Terminal cleft shaped as an inverted U with widely divergent branches, 32 (30–34) long. Supranal concavity semicircular. Setae f2 anterior to bases of setae ps2. Setae h1 situated at level of anterior end of terminal cleft. Setae h3 setiform, 65 (58–65) long; setae ps2 85 (85–90) long. Setae ps1 filiform, about 7 long, situated on margin of terminal cleft slightly anterior to level of setae h2. Distances between dorsal setae: c2:d2 88 (85–90), d2:e2 80 (75–85), e2:h3 53 (50–55), d1:d2 31 (30–35), e1: e2 25 (22–26), h1:ps2 18 (18– 23), h2:h2 60 (50–60), h3:h3 43 (33–44), ps2:ps2 72 (65–72).

Epimerites I fused into a narrow U, fused part with pair of short and acute lateral extensions and small and pointed median extension; lateral extension touching small triangular sclerotized fields on inner margins of epimerites II (in some specimens fused with them) ( Fig. 19B ). 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 IVa absent. Genital arch of moderate size, 23 (23–25) × 45 (40–45); aedeagus sword-shaped, 98 (95–100) long, extending to anterior end of terminal cleft; basal sclerite of genital apparatus small, roughly rectangular ( Fig. 21A ). Genital papillae not connected at bases. Genital and adanal shields absent. Adanal suckers 13 (12–14) 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 with roughly triangular extensions bearings setae ps3. Setae 4b situated posterior to level of setae 3a, setae ps3 at level of posterior margin of adanal suckers. Distance between ventral setae: 4b: 3a 8 (8–10), 4b:4a 40 (35–40), 4a:g 38 (35–28), g:ps3 55 (50–55), ps3:ps3 63 (60–65), ps3:h3 38 (35–38).

Femora I, II with narrow ventral crests, other segments of legs I, II without processes ( Figs. 21B, C ). Solenidion σ1 of genu I half as along 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 proximal margin of ambulacral disc. Tarsus IV 28 (25–28) long, with apical process; seta d in basal half of this segment ( Fig. 21D ). Length of solenidia: ω 1 I 13 (11–13), ω 1 II 10 (8–10), σ 1 I 10 (9–11), σ III 8 (6–8), φ IV 32 (30–34).

FEMALE (range for 10 paratypes). Idiosoma, length × width, 485–515 × 160–170, length of hysterosoma 330–365. Prodorsal shield: entire, anterolateral extension long and narrow, with subapical ledge, lateral margins concave at level of scapular setae, posterior margin concave, posterior margins acute, surface without ornamentation, 125–130 × 125–140. Setae ve rudimentary, represented by alveoli. Bases of setae se separated by 65–77. Scapular shields narrow, scarcely developed dorsally. Humeral shields represented by narrow longitudinal sclerites, situated ventrally. Setae cp on ventral margins of humeral shields, c2 situated on striated tegument. Setae c3 lanceolate, 20–22 × 7–8. Anterior and lobar parts of hysteronotal shield separated dorsally by narrow transverse band of soft tegument. Anterior hysteronotal shield nearly rectangular, slightly attenuate anteriorly, anterior margin convex, posterolateral areas with minute circular lacunae, greatest length 265–285, width at anterior margin 120– 140 ( Fig. 20A ). Length of lobar region 90–95, greatest width 85–90. Terminal cleft narrow V-shaped, 60–65 long. Lobar shield entire, anterior margin convex with small median incision, posterior margin with narrow median incision extending to area of supranal concavity; surface without ornamentation. Supranal concavity poorly delineated. Setae h1 at level of supranal concavity; setae h1 and f2 arranged in a trapezium. Setae h2 spindle-like, 38–42 × 7.5–8.5. Setae ps1 situated on inner margins of opisthosomal lobes, close to lobar apices. Setae h 3 16–18 long, 1/7–1/8 the length of terminal appendages. Distances between dorsal setae: c2:d2 105–115, d2:e2 115–135, e2:h2 56–62, h2:h3 42–45, d1:d2 40–45, e1: e2 36–40, h1:h2 36–40, h1:h 1 28–35, h2:h2 66–70, h2:ps 1 25–30.

Epimerites I fused into a V, fused part with narrow median extension ( Fig. 20A ). Lateral parts of coxal fields I, II without large sclerotized areas. Epimerites IVa absent. Translobar apodemes of opisthosomal lobes present, wide, not fused to each other anterior to terminal cleft. Epigynum with small lateral ledges, greatest width 70–78; apodemes of oviporus free from epimerites IIIa. Pseudanal setae filiform, setae ps2 situated at level of posterior half of anal opening and widely separated from each other; distance between pseudanal setae: ps2:ps2 52–54, ps3:ps 3 18–20, ps2:ps 3 15–20. Primary spermaduct with ampuliform enlargement near head of spermatheca; continuation of primary spermaduct inside spermatheca funnel-shaped, with denticles on free margin; secondary spermaducts about 35 long ( Fig. 21E ).

Legs I, II as in male. Solenidion σ1 of genu I approximately half as long as this segment and situated at its midlevel. Genual setae cG I, II, mG I, II as in male. Seta d and f of tarsi II subequal, setae d of tarsi III, IV much shorter than corresponding setae f. Genu IV dorsally inflated, with narrow dorsal crest. Lengths of solenidia: ω 1 I 15–18, ω 1 II 10–12, σ1 I 9–11, σ III 7–8, φ III 22–26, φ IV 10–12.

Differential diagnosis. The new species, Amerodectes haemorhous sp. n., belongs to a large grouping of species characterized by long setae h 3 in males, exceeding the distance between their bases of scapular setae se, and is most similar close to A. sialiarum ( Stoll, 1893) from Sialia sialis (Linnaeus) (Turdidae) , found on this host so far in Guatemala and USA ( Stoll 1893; Valim & Hernandes 2008). In both sexes of these two species, the humeral shields are represented by narrow longitudinal sclerites, dorsal shields of idiosoma have few minute lacunae or without them; in males, the aedeagus extends to the anterior end of the terminal cleft, and the basal sclerite is shaped as small transverse rectangle; in females, the posterior angles of the prodorsal shield are noticeably elongate posteriorly. Amerodectes haemorhous differs from A. sialiarum by the following features: in both sexes, the anterolateral extensions of the prodorsal shield have a small subapical ledge, the distance between the levels of setae d1 and d2 is only half that between the levels of setae d2 and e1; in males, epimerites I are fused into a narrow U, and setae 4b are situated distinctly posterior to setae 3a; in females, setae ps3 are situated at the level of the anterior third of anal opening, the lobar shield has a narrow and deep incision in posterior margin, the supranal concavity is scarcely distinct, and the secondary spermaducts are about 35 µm long. In both sexes of A. sialiarum , the anterolateral extensions of the prodorsal shield are without subapical ledges, the distance between the levels of setae d1 and d2 is approximately equal to the distance between the levels of setae d2 and e1; in males, epimerites I are fused into a V, and setae 4b and 3a are situated at the same transverse level; in females, setae ps3 are situated at the level of the anterior margin of anal opening, the lobar shield is without an incision on the posterior margin, the supranal concavity is narrowly ovate, and the secondary spermaducts are 10–15 µm long.

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

Figures

FIGURE 19. Amerodectes haemorhous sp. n., male. A—dorsal view, B—ventral view.

FIGURE 20. Amerodectes haemorhous sp. n., female. A—dorsal view, B—ventral view.

FIGURE 21. Amerodectes haemorhous 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.