Amerodectes vireonis Hernandes & Pedroso

Hernandes, Fabio Akashi, Pedroso, Luiz Gustavo A. & Oniki-Willis, Yoshika, 2016, Five new feather mites of the subfamily Pterodectinae (Acariformes: Astigmata: Proctophyllodidae) from passerines and hummingbirds (Aves) of Brazil, Zootaxa 4161 (3), pp. 301-328 : 307-311

Amerodectes vireonis Hernandes & Pedroso sp. nov.

( Figs. 4–6 , 16 B, 17B, 17G)

Type material. Holotype male, paratypes 1 male and 1 female ex Vireo olivaceus (Linnaeus, 1766) ( Passeriformes : Vireonidae ), BRAZIL, Paraná State, Guaratuba, Reserva "Bicudinho-do-brejo", 25°45'22"S 48°43'30,9"W, 12 January 2012, C.O.A. Gussoni col. ; 3 males and 2 females, same host species, BRAZIL, São Paulo State, Jacupiranga , 24°41'34"S 48°00'07"W, 0 8 February 1979, Y. Oniki-Willis and E.O. Willis cols. (#Y-52) ; 5 males and 5 females ex Vireo olivaceus (Linnaeus, 1766) ( Passeriformes : Vireonidae ), BRAZIL, Paraná State, Parque Nacional Superagüi, Barranco Branco , 25°19'S 48°09'W, 23 November 1993, M. Arzua col. ( ARM #1642 ).

Type deposition. Holotype male at DZUnesp-RC (#3603); paratypes at DZUnesp-RC (#3604–3614), MHNCI, ZISP, UMMZ, USNM, and DZSJRP.

Male. (holotype, range for 8 paratypes in parentheses). Idiosoma, length × width, 385 (339–371) × 155 (144– 157). Prodorsal shield: transversally split at level of scapular setae, posterior margin sinuous, posterior angles pointed, length 121 (101–115), width 121 (109–123), surface smooth ( Fig. 4 A); bases of scapular setae se separated by 54 (45–56). Setae ve present, rudimentary. Scapular shields narrow, not developed dorsally. Humeral shields absent. Setae cp and c2 situated on striated tegument. Subhumeral setae c3 lanceolate, 26 (20–29) × 7 (6–8). Hysteronotal shield: greatest length 234 (210–233), width at anterior margin 108 (91–112), anterior margin concave, surface without lacunae. Distance between prodorsal and hysteronotal shields 32 (18–29). Posterior margins of opisthosomal lobes rounded. Terminal cleft shaped as a wide, inverted U with divergent branches, 27 (27–33) long. Supranal concavity present, extending to level of setae h1. Setae f2 anterior to bases of setae ps2. Setae h3 spiculiform, 23 (16–25) long; setae ps2 63 (63–87) long; setae ps1 filiform, about 5 long, situated slightly anterior to bases of setae h3. Distances between dorsal setae: c1: d2 96 (83–96), d2: h1 107 (92–110), h2: h2 65 (41– 61), h3: h3 49 (30–58).

Epimerites I fused into a V with two small divergent branches posteriorly ( Fig. 4 B). Coxal fields I, II without extensively sclerotized areas. Rudimentary sclerites rEpIIa absent. Coxal fields II–IV open. Epimerites IVa indiscernible. Genital arch 42 (33–45) in width; aedeagus 67 (63–74) long from anterior bend to tip, extending to midlevel of adanal suckers. Genital papillae connected at bases. Genital and adanal shields absent. Adanal suckers 12 (11–12) in diameter, distance between centers of discs 39 (32–42), corolla smooth, surrounding membrane with radial striae. Opisthoventral shields occupying lateral areas of opisthosoma; inner margins of these shields at level of anal suckers with two extensions, anterior ones bear setae ps3. Setae 3a and 4b situated approximately at the same transverse level. Distance between ventral setae: 1a: 4b 132 (119–132), 4b: 4a 43 (30–37), 4a: g 47 (42–47), g: ps3 50 (44–51), ps3: ps3 74 (65–77).

Femora II with narrow ventral crest, other segments of legs I–IV without processes ( Figs 6 A–D). Solenidion σ 1 of genu I 18 (15–19) long, situated at midlevel of segment; solenidion σ of genu III inserted at distal half of segment. Genual setae cG I, II and mG I, II filiform. Seta d of tarsi II subequal in length to corresponding seta f; seta d of tarsi III two to three times shorter than corresponding seta f ( Fig. 6 C). Solenidion φ of tibia IV extending to midlevel of ambulacral disc. Tarsus IV 32 (26–33) long, without claw-like apical process; setae d and e button-like, seta d situated basally, at the same level as seta r ( Fig. 6 D).

Female (range for 7 paratypes). Idiosoma, length × width, 505–522 × 178–194. Prodorsal shield: entire, with two deep lateral incisions around setae se and extending to bases of setae si, posterior margin with two shallow concavities, posterolateral angles acute, length 121–126, width 130–149, surface without lacunae; bases of setae se separated by 68–75 ( Fig. 5 A). Setae ve present, rudimentary. Scapular shields narrow, poorly developed dorsally. Humeral shields absent. Setae cp and c2 situated on striated tegument. Setae c3 lanceolate, 22–28 × 5–8. Anterior and lobar parts of hysteronotal shield separated dorsally by narrow transverse band of soft tegument ( Fig. 5 A). Distance between prodorsal and anterior hysteronotal shields 26–39. Anterior hysteronotal shield roughly rectangular, anterior margin straight, greatest length 235–262, width at anterior margin 126–141, surface without lacunae. Length of lobar region 100–108, greatest width 89–110. Lobes touching each other in some specimens, terminal cleft narrow, 65–81 long. Supranal concavity; lobar shield undivided medially, surface without ornamentation. Setae h1 situated at same level as setae f2. Setae h2 lanceolate with blunt apex, 51–56 × 6–8. Setae ps1 situated near inner margins of opisthosomal lobes, approximately midway between h3 and h2. Setae h 3 13–17 long. Distances between dorsal setae: c1: d2 110–122, d2: h1 139–150, h2: h2 67–89, h3: h 3 25–35.

Epimerites I fused as a narrow U with two small divergent branches posteriorly ( Fig. 5 B). Coxal fields I–IV open. Epimerites IVa indiscernible. Translobar apodemes of opisthosomal lobes present, narrowly fused to each other anterior to terminal cleft. Epigynum horseshoe shaped, greatest width 76–88; apodemes of ovipore connected with epimerites IIIa. Primary spermaduct with small bulbous enlargement near the head of spermatheca; secondary spermaducts 28–44 long ( Fig. 17 G). Pseudanal setae filiform, setae ps2 situated at level of posterior half of anal opening; distance between pseudanal setae: ps2: ps2 43–61, ps3: ps 3 31–38, ps2: ps 3 13–23.

Femora II with ventral crest, other segments of legs I, II without processes. Solenidion σ1 of genu I short, 16– 22 long, situated at midlevel of segment. Solenidion σ of genu III inserted basally. 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 about 2–3 times shorter than corresponding setae f. Genu IV slightly inflated dorsally.

Differential diagnosis. Amerodectes vireonis sp. nov. resembles five other species of the genus which have, in males, setae h3 spiculiform and short, and the aedeagus reaching the level of the adanal suckers, namely: A. caribaeus Mironov & Gonzalez-Acuña 2011 , A. contopus Mironov & González-Acuña 2011 , A. plumbeus Mironov & González-Acuña 2011 , A. troglodytis ( Černý 1974) , and A. wilsoniae Mironov & González-Acuña 2011 . The new species is distinguished from these and also from all remaining species of the genus by having, in males, the prodorsal shield completely split transversally at the level of the scapular setae. In males of all known species, the prodorsal shield at most has lateral incisions surrounding setae se, as in A. pitangi ( Mironov 2008) and A. troglodytis ( Černý 1974) .

This is the first Amerodectes species described from the family Vireonidae .

Etymology. The specific name is derived from the generic name of the host, Vireo and is a noun in the genitive case.

Figures

FIGURE 4. Amerodectes vireonis sp. n., male. A—dorsal view, B—ventral view.

FIGURE 5. Amerodectes vireonis sp. n., female. A—dorsal view, B—ventral view.

FIGURE 6. Amerodectes vireonis sp. n., legs. A – D—male legs I – IV, respectively; E—female tarsus III; F—female tarsus IV.

FIGURE 16. Dorsal view of female lobar region: A— Amerodectes longifuscus sp. n.; B— Amerodectes vireonis sp. n.; C— Tyrannidectes synallaxis sp. n.; D— Trochilodectes willisi sp. n.; E— Xynonodectes phaethornis sp. n.

FIGURE 17. Details of genital apparatus. A – E—aedeagus: A— Amerodectes longifuscus sp. n.; B— Amerodectes vireonis sp. n.; C— Tyrannidectes synallaxis sp. n.; D— Trochilodectes willisi sp. n.; E— Xynonodectes phaethornis sp. n.; F – H—female spermatheca: F— Amerodectes longifuscus sp. n.; G— Amerodectes vireonis sp. n.; H— Tyrannidectes synallaxis sp. n.