Amerodectes plumbeus, Mironov & González-Acuña, 2011

Mironov, Sergey & González-Acuña, Daniel, 2011, New feather mites of the subfamily Pterodectinae (Acariformes: Proctophyllodidae) from passerines (Aves: Passeriformes) from Chile and Cuba, Zootaxa 3057, pp. 1-48 : 25-28

Amerodectes plumbeus sp. n.

( Figs. 13 F–J, 14, 15)

Type material. Male holotype ( ZISP 4626 ), 3 male and 5 female paratypes from the Red-legged Thrush Turdus plumbeus Linnaeus (Turdidae) , CUBA: Habana, 23°6'52"N 82°23'1"W, 27 October 2007, coll. D.A. González-Acuña.

Type depository. Holotype, 2 males and 4 female paratypes—ZISP, remaining paratypes—DGA.

Description. MALE (holotype, range for 3 paratypes in parentheses). Idiosoma, length × width, 428 (425–435) × 168 (165–173), length of hysterosoma 285 (280–290). Prodorsal shield: 128 (125–133) × 130 (130–135), lateral margins entire, posterior margin straight, antero-lateral extensions rounded, entire surface with numerous circular lacunae up to 8 in diameter; scapular setae se separated by 66 (60–66) ( Fig. 14 A). Setae ve present. Humeral shields present, narrow, situated laterally, separated from epimerites III. Setae cp situated at ventral margin of humeral shield. Setae c2 situated on anterior end of humeral shield. Subhumeral setae c3 lanceolate, 27 (27–29) × 9 (8–9). Hysteronotal shield: greatest length 294 (290–295), width in anterior part 120 (120–126), anterior margin slightly concave, entire surface with numerous circular lacunae as in prodorsal shield. Distance between prodorsal and hysteronotal shields 10 (10–12). Opisthosomal lobes approximately as long as wide at base; posterior ends of lobes roughly rounded, with wide oblique extension at base of setae h2 and with pair of small extensions at bases of setae h3 that form three small teeth on lobar apices. Terminal cleft shaped as an inverted U with slightly divergent branches, 42 (40–45) in length. Supranal concavity indistinct. Setae f2 slightly anterior to bases of setae ps2. Setae h1 much anterior to terminal cleft. Setae h3 narrowly lanceolate with acute apices, 40 (38–42) × 5 (4.5–6); setae ps2 90 (88–95) long, setae ps1 minute, filiform, about 10 long, situated on margin of terminal cleft approximately at level of setae ps2. Distance between bases of dorsal setae: c2:d2 117 (110–118), d2:e2 100 (98–106), e2:h3 68 (62–70), d1:d2 40 (40–45), e1:e2 29 (27–41), h1:ps2 33 (30–35), h2:h2 66 (65–73), h3:h3 47 (45–53), ps2:ps2 86 (85–94).

Epimerites I fused into a V, fused part connected to medial parts of epimerites II by narrow transverse bands ( Fig. 14 B). Coxal fields I, II without extensive sclerotized areas. Rudimentary sclerites rEpIIa absent. Coxal fields II, III open. Coxal fields IV with sclerotized area at base of trochanters IV. Epimerites IVa present, short. Genital arch of moderate size, 31 (30–33) × 44 (42–45); basal sclerite of genital apparatus with semicircular posterior margin; aedeagus sword-shaped, 115 (110–115) long, extending to midlevel of anal suckers; genital papillae not connected by bases. Genital and adanal shields absent. Anal suckers 14 (14–15) in diameter, corolla smooth. Opisthoventral shields wide, occupying distal half of opisthosomal lobes and lateral areas of opisthosoma; inner margins with wide bidentate extensions at level of anal suckers, setae ps3 at midlevel of anal suckers. Distance between ventral setae: 3b:3a 13 (13–15), 3a:4a 47 (45–48), 4a:g 58 (53–60), g:ps3 64 (62–66), ps3:ps3 70 (70– 75), ps3:h3 42 (40–44).

Femora I, II with narrow ventral crests, other segments of legs I, II without processes. Solenidion σ 1 of genu I 9 (9–10) long, situated at midlevel of segment; genual setae cG I, II and mG I, II filiform ( Figs. 13 F, G). Seta d of tarsus II subequal to corresponding seta f, seta d of tarsus III shorter than corresponding setae f. Tarsus IV 32 (31– 33) long, without apical process; seta d in basal half of segment; solenidion φ of tibia IV extending to midlevel of ambulacral disc ( Fig. 13 H).

FEMALE (5 paratypes). Idiosoma, length × width, 560–588 × 200–210, length of hysterosoma 395–410. Prodorsal shield: general form and surface as in male except for posterior angles extending much more laterally, 144– 146 × 162–164, setae se separated by 73–82 ( Fig. 15 A). Setae ve present. Humeral shields present, narrow, situated laterally, separated from epimerites III. Setae cp situated on ventral margin of humeral shield. Setae c2 situated on anterior end of humeral shields. Setae c3 lanceolate, 30–33 × 9–10. Distance between prodorsal and hysteronotal shields 15–18. Anterior and lobar parts of hysteronotal shield separated dorsally by narrow transverse band of soft tegument, but remain connected ventro-laterally ( Fig. 15 B). Anterior hysteronotal shields slightly attenuate posteriorly, anterior margin concave, greatest length 304–320, width at anterior margin 148–155, whole surface with numerous circular lacunae as in prodorsal shield. Length of lobar region 110–115, greatest width 98–108. Terminal cleft as a narrow U, extending to level of setae h2, 56–58 long, width at level of lobar apices 20–23. Supranal concavity well developed, circular; surface of lobar shield with 2–3 pairs of circular lacunae lateral to supranal concavity. Setae h1 on lobar shield, distant from anterior margins, situated slightly posterior to level of supranal concavity; setae h1 and f2 arranged in almost transverse row. Setae h2 spindle-like, 58–60 × 9–10. Setae ps1 near inner margins of opisthosomal lobes. Setae h3 20–24 long, about 1/8th length of terminal appendages. Distance between dorsal setae: c2:d2 122–135, d2:e2 133–142, e2:h2 72–77, h2:h3 50–52, d1:d2 45–62, e1:e2 45–48, h1:h2 31–35, h1:h1 33–35, h2:h2 77–84.

Epimerites I fused into a V, fused part without lateral extensions. Lateral parts of coxal fields II with large sclerotized areas ( Fig. 15 B). Epimerites IVa absent. Translobar apodemes of opisthosomal lobes present, wide, not fused to each other anterior to terminal cleft. Epigynum without lateral extensions, greatest width 75–77; apodemes of oviporus fused with epimerites IIIa. Pseudanal setae filiform, setae ps2 posterior to anal opening and widely separated from each other, distance between setae: ps2:ps2 48–57, ps3:ps3 24–28, ps2:ps3 44–46. Primary spermaduct without enlargements; secondary spermducts short, with well sclerotized part 8–10 long ( Fig. 13 J).

Femora I, II with ventral crest, other segments of these legs without processes. Solenidion σ 1 of genu I short, 9–10 long, situated at midlevel of segment. Genual setae cG I, II and mG I, II filiform. Seta d of tarsus II subequal to corresponding seta f, setae d of tarsi III, IV shorter than corresponding setae f. Genu IV dorsally inflated, with narrow longitudinal dorsal crest ( Fig. 13 I), genu III without noticeable dorsal crest.

Differential diagnosis. Amerodectes plumbeus sp. n. is obviously very closely related to A. turdinus ( Berla, 1959) originally described from Tudus rufiventris Vieillot (Turdidae) in Brazil and subsequently recorded from three more Turdus species in Brazil and Surinam ( Berla 1959a; Černý & Lukoschus 1975; Valim & Hernandes 2010) by having the dorsal shields completely covered with large circular lacunae (up to 8 in diameter) and well developed humeral shields in both sexes, and relatively long dagger-like setae h 3 in males. Amerodectes plumbeus differs from A. turdinus by the following features: in males, the aedeagus extends to the midlevel of the anal suckers, the length of setae h3 is subequal to the distance between their bases, and the bases of trochanters IV are flanked by narrow bands connecting corresponding epimerites IV and IVa; in females, setae h2 are spindle-like, the supranal concavity is flanked laterally by 2–4 circular lacunae, and epimerites IVa are absent. In males of A. turdinus , the aedeagus extends to the anterior margin of the anal suckers, the length of setae h3 is almost twice as long as the distance between their bases, and the bases of trochanters IV are not flanked by narrow bands; in females, setae h2 are spindle-like with filiform apices, the supranal concavity is flanked by one pair of large circular lacunae, and epimerites IVa are present.

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

Figures

FIGURE 13. Amerodectes species, details. A – E — Amerodectes caribaeus sp. n., F – J — Amerodectes plumbeus sp. n. A, B — legs I – II of male, C — tibia and tarsus IV of male, D — femur and genu IV of female, E — spermatheca and spermaducts, F, G — legs I, II of male, H — tibia and tarsus IV of male, I — femur and genu IV of female, J — spermatheca and spermaducts.

FIGURE 14. Amerodectes plumbeus sp. n., male. A — dorsal view, B — ventral view. hm—humeral shield.

FIGURE 15. Amerodectes plumbeus sp. n., female. A — dorsal view, B — ventral view. hm—humeral shield.