Tyrannidectes synallaxis 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 : 312-315

Tyrannidectes synallaxis Hernandes & Pedroso sp. nov.

( Figs. 7–9 , 16 C, 17C, 17H)

Type material. Holotype male, paratypes 37 males and 61 females ex Synallaxis ruficapilla Vieillot, 1819 ( Passeriformes : Furnariidae ), BRAZIL, São Paulo State, Sete Barras , 24°23'S 47°55'W, 15 July 1979, Y. Oniki- Willis and E.O. Willis cols. (#Y-27).

Type deposition: Holotype male at DZUnesp-RC(#3615); paratypes at DZUnesp-RC (#3616– 3668), MHNCI, ZISP, UMMZ, USNM, and DZSJRP.

Male. (holotype, range for 8 paratypes in parentheses). Idiosoma, length × width, 342 (332–355) × 146 (130– 145). Prodorsal shield: entire, lateral margins slightly concave at level of scapular setae, posterior margin sinuous, posterior angles acute, length 112 (111–118), width 100 (101–110), surface with a few rounded lacunae posterior to scapular setae ( Fig. 7 A); bases of scapular setae se separated by 53 (50–53). Setae ve present, rudimentary. Scapular shields narrow. Humeral shields absent. Setae cp and c2 situated on striated tegument. Subhumeral setae c3 lanceolate, 28 (26–28) × 8 (7–9). Hysteronotal shield: greatest length 220 (215–228), width at anterior margin 95 (87–97), anterior margin sinuous, surface with small uniformly disposed lacunae. Distance between prodorsal and hysteronotal shields 10 (7–15). Posterior margins of opisthosomal lobes rounded. Terminal cleft shaped as an inverted U with divergent branches, 19 (18–23) long. Supranal concavity poorly distinct. Setae f2 absent. Setae h1 situated approximately at the same level as ps3. Setae h3 setiform, 23 (21–27) long; setae ps2 83 (68–92) long; setae ps1 filiform, about 5 long, situated slightly anterior to bases of setae h3. Distances between dorsal setae: c1: d2 90 (85–92), d2: h1 95 (92–109), h2: h2 46 (43–49), h3: h3 30 (26–32).

Epimerites I fused into a V, fused part tridentate posteriorly ( Fig. 7 B). Coxal fields I, II without extensively sclerotized areas. Rudimentary sclerites rEpIIa absent. Coxal fields I–IV open. Epimerites IVa indiscernible. Genital arch 46 (43–49) in width; aedeagus 158 (148–156) long from anterior bend to tip, extending to tip of setae h3. Genital papillae connected at bases. Genital and adanal shields absent. Adanal suckers 11 (10–13) in diameter, distance between centers of discs 26 (26–28), corolla indented, surrounding membrane with radial striae. Opisthoventral shields occupying lateral areas of opisthosoma; inner margins of these shields posterior to level of anal suckers with angular extensions, setae ps3 inserted on anterior margins of these extensions. Setae 3a and 4b situated approximately at the same transverse level. Distance between ventral setae: 1a: 4b 103 (102–113), 4b: 4a 34 (33–38), 4a: g 35 (38–45), g: ps3 64 (62–68), ps3: ps3 56 (57–62).

Femora I, II without crests ( Fig. 9 A,B), other segments of legs I–IV without processes. Solenidion σ1 of genu I 12 (10–14) long, situated at midlevel of segment; solenidion σ of genu III inserted at midlevel of segment. Genual setae cG I, II and mG I, II filiform. Seta d of tarsi II slightly shorter than corresponding seta f; seta d of tarsi III two times shorter than corresponding seta f ( Fig. 9 C). Solenidion φ of tibia IV extending to midlevel of ambulacral disc. Tarsus IV 29 (24–30) long, without claw-like apical process; setae d and e button-like, seta d situated basally at level of seta r ( Fig. 9 D).

Female (range for 8 paratypes). Idiosoma, length × width, 485–518 × 162–175. Prodorsal shield: shaped as in male, length × width, 126–136 × 138–151, surface with small lacunae, bases of setae se separated by 71–76 ( Fig. 8 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, 27–33 × 7–10. Anterior and lobar parts of hysteronotal shield separated, without integument between those shields ( Fig. 8 A). Distance between prodorsal and anterior hysteronotal shields 16–30. Anterior hysteronotal shield roughly rectangular, anterior margin straight, greatest length 248–271, width at anterior margin 122–134, surface with numerous lacunae and a pair of lightly sclerotized areas at level of setae e2. Length of lobar region 84–95, greatest width 84–96. Terminal cleft narrow, 68–94 long. Supranal concavity distinct; lobar shield undivided medially, surface without ornamentation. Setae f2 absent. Setae h1 at same level as supranal concavity. Setae h2 lanceolate with blunt apex, 49–54 × 7–8. Setae ps1 situated near inner margins of opisthosomal lobes, approximately equidistant between h3 and h2. Setae h 3 22–28 long. Distances between dorsal setae: c1: d2 99–120, d2: h1 139–156, h2: h2 67–75, h3: h 3 30–48.

Epimerites I fused into a V ( Fig. 8 B). Coxal fields I–IV open. Epimerites IVa indiscernible. Translobar apodemes of opisthosomal lobes present, wide, fused to each other anterior to terminal cleft. Epigynum horseshoe shaped, greatest width 60–79; apodemes of ovipore connected with epimerites IIIa. Primary spermaduct with slight bulbous swelling near the head of spermatheca; secondary spermaducts 23–36 long ( Fig. 17 H). Pseudanal setae filiform, setae ps2 situated at level of posterior half of anal opening; distance between pseudanal setae: ps2: ps2 41– 56, ps3: ps 3 24–29, ps2: ps 3 15–19.

Femora II with ventral crest, other segments of legs I, II without processes. Solenidion σ1 of genu I short, 14– 18 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 of tarsi I, II slightly shorter than corresponding seta f, setae d of tarsi III, IV 2–3 times shorter than corresponding setae f. Genu IV dorsally inflated, with narrow dorsal crest.

Differential diagnosis. Tyrannidectes synallaxis sp. nov. resembles T. anairetes Mironov & González-Acuña 2011 by lacking setae f2, and also in having, in females, setae ps2 and ps3 setiform (not button-like) and h2 lacking terminal filament. The new species is clearly distinguished from the latter in having the following features: in both sexes, numerous lacunae are present on the prodorsal and hysteronotal shields; in males, the aedeagus is much longer, surpassing the body terminus and slightly extending beyond the apices of setae h3; and in females, setae e2 are inserted far anterior from the postero-lateral angles of the hysterosomal shield. In both sexes of T. anairetes the dorsal shields are smooth, the aedeagus of males reaches only the level of the anterior margins of the adanal suckers, and in females, setae e2 are inserted at the posterior margins of the anterior hysterosomal shield.

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

Figures

FIGURE 7. Tyrannidectes synallaxis sp. n., male. A—dorsal view, B—ventral view.

FIGURE 8. Tyrannidectes synallaxis sp. n., female. A—dorsal view, B—ventral view.

FIGURE 9. Tyrannidectes synallaxis 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.