Trouessartia savanae, Hernandes, Fabio Akashi, 2014

Hernandes, Fabio Akashi, 2014, Five new species of the feather mite genus Trouessartia Canestrini from South America (Acari: Trouessartiidae), Zootaxa 3856 (1) : -

Trouessartia savanae sp. nov.

( Figs. 10–12 )

Type-host: Tyrannus savana Vieillot, 1808 ( Passeriformes , Tyrannidae ), Fork-tailed Flycatcher.

Type-locality: Brasília, Distrito Federal, Brazil.

Material examined. Male holotype, 5 male and 9 female paratypes ex Tyrannus savana , BRAZIL: Distrito Federal, Brasília, Parque Alvorada, 15°47'S, 47°50'W, November 2012, coll. A. E. Jahn; 6 males and 10 females ex T. savana , ARGENTINA: Parque Luro, Província La Pampa, 35°08'S, 57°23'W, 15 December, 2013, coll. A. E. Jahn; 1 male and 4 females ex T. savana , ARGENTINA: Reserva privada El Destino, Província Buenos Aires, 18 December, 2013, coll. A. E. Jahn. Type specimen deposition: holotype and most paratypes at DZUnesp-RC; 1 male and 1 female paratypes at each UMMZ, ZISP.

Etymology. The epithet is taken from the specific name of the type host, and is a noun in the genitive case.

Description. Male (holotype, range for 5 paratypes in parentheses). Length of idiosoma from anterior end to bases of setae h3 465 (439–506), greatest width of idiosoma at level of humeral shields 229 (199–254). Length of hysterosoma from sejugal furrow to bases of setae h3 310 (304–342). Prodorsal shield: length along midline 140 (133–154), greatest width of posterior part 147 (149–165), anterior part at level of trochanters II not narrowed, antero-lateral extensions not extending to bases of epimerites Ia between legs I and II, lateral margins not fused with scapular shields, posterior margin almost straight, surface without ornamentation ( Fig. 10 A). Vertical setae ve represented only by alveoli. Internal scapular setae si thin needle-like, 22 (25–31) long, separated by 54 (55–61); external scapular setae se 144 (153–169) long, separated by 96 (98–122). Humeral shield with setae c2 needle-like, 44 (33–58) long. Setae c3 narrowly lanceolate, acute apically, 25 (22–30) long. Dorsal hysterosoma with broadly connected prohysteronotal shield and lobar shield. Prohysteronotal shield: length 193 (199–218), widest part near anterior margin 154 (154–176), lateral margins without incisions at level of trochanters III, dorsal hysterosomal apertures (DHA) absent, central area with faint circular lacunae. Dorsal setae d1 present, minute, d2 absent. Length of lobar shield excluding lamellae 90 (87–105). Apical parts of opisthosomal lobes touching each other, separated by narrow parallel-sided terminal cleft, length of cleft from anterior end to apices of lamellae 41 (39–50), width in anterior part 4 (3–5). Lamellae nearly rectangular, margins smooth, length from bases of setae h3 to lamellar apices 23 (21–30). Seta h2 281 (236–302) long, seta h3 176 (150–177) long. Distance between dorsal setae: c2: d2 103 (104–128), d2: e2 97 (82–95), e2: h2 77 (70–93), h2: h3 22 (20–25), h2: h2 42 (39–44), h3: h3 29 (29–32), d1: d2 57 (53–70), e1: e2 44 (39–58).

Epimerites I free. Rudimentary sclerites rEpIIa small. Genital apparatus situated between levels of trochanters III and IV, length excluding basal sclerite 55 (52–59), greatest width 28 (26–31) ( Fig. 10 B). Epiandrum present, large and roughly square-shaped. Anterior and posterior pairs of genital papillae approximate. Setae g short, filiform, alveoli contiguous. Postgenital plaque absent. Adanal apodemes heavily sclerotized, without rounded apophyses. Translobar apodeme present. Adanal shields small, triangular, bearing setae ps3. Anal suckers 17 (16–19) in diameter, distance between centers of discs 28 (30–33). Epimerites IVa long, anterior ends reaching level of setae g. Setae 4b situated slightly anterior to level of setae 3a, setae g situated posterior to setae 4a. Distance between ventral setae 4b: 3a 38 (36–47), 4b: g 96 (94–110), g: ps3 50 (45–52), ps3: ps2 64 (64–70).

Legs IV extending by ambulacral disc slightly beyond level of setae h3. Setae sR of trochanters III short, narrowly lanceolate, acute apically, 19 (17–21) long. Modified setae d of tarsus IV barrel-shaped, with discoid cap, situated at distal half of segment; modified setae e hemispheroid, without cap, situated apically ( Fig. 12 D). Length of solenidia: σ1 of genu I 49 (46–55), σ of genu II 14 (10–15), σ of genu III 23 (21–25), ϕ of tibia I 76 (78–83), ϕ of tibia II 87 (80–90), ϕ of tibia III 67 (61–71), ϕ of tibia IV 38 (39–43), ω1 of tarsus I 19 (21–24), ω3 of tarsus I 32 (29–38), ω1 of tarsus II 22 (21–25).

Female (range for 5 paratypes). Length of idiosoma from anterior end to apices of lamellar lobar processes 540–561, greatest width 214–248. Length of hysterosoma from sejugal furrow to apices of lamellar lobar processes 375–404. Prodorsal shield: shaped as in male, 142–160 in length, 160–169 in width, surface without ornamentation ( Fig. 11 A). Vertical setae ve represented only by alveoli. Setae si thin needle-like, 27–33 long, separated by 58–61; setae se 139–177 long, separated by 103–111. Humeral shields with setae c2 needle-like, 43–50 long. Setae c3 narrowly lanceolate, acute apically, 22–26 in length. Hysteronotal shield: length from anterior margin to bases of setae h3 327–351, width at largest part near anterior margin 162–175, lateral margins without incisions at level of trochanters III, DHA absent, anterior part with faint circular lacunae, posterior part with small circular and ovate lacunae. Dorsal setae d1 present, d2 absent. Setae h1 short spiculiform, 16–19 long, situated antero-mesal to bases of setae h2, 25–28 from each lateral margin of hysteronotal shield. Width of opisthosoma at level of setae h2 106–121. Setae ps1 positioned dorsally on opisthosomal lobes, equidistant from outer and inner margins of lobe, closer to bases of h3 than to h2. Distance from bases of setae h3 to membranous apices of lobes 34–41. Setae f2 absent. Supranal concavity open posteriorly into terminal cleft. Length of terminal cleft together with supranal concavity 143–156, width of cleft at level of setae h3 34–49. Interlobar membrane small. External copulatory tube present, protruding from dorsal surface of interlobar membrane, small finger-like, 17–20 long. Spermatheca as in Fig. 12 I. Distance between dorsal setae: c2: d2 119–123, d2: e 2 88 –106, e2: h2 40–47, h2: h3 70–79, h2: h2 86–98, h3: h3 64–77, d1: d2 62–64, e1: e2 78 –81, h1: h 2 25–29, h1: h1 48–53, ps1: h3 18:21.

Epimerites I free. Epigynum 52–55 in length, 82–102 in width ( Fig. 11 B). Epimerites IVa present, thin. Anal opening with pair of small ovate sclerites situated at level of its anterior end. Setae sR of trochanters III narrowly lanceolate, acute apically, 16–20 long. Legs IV extending by ambulacral disc to level of setae ps1. Length of solenidia: σ1 of genu I 48 –61, σ of genu II 16–19, σ of genu III 25–30, ϕ of tibia I 82 –92, ϕ of tibia II 83 –96, ϕ of tibia III 63 –66, ϕ of tibia IV 28–34, ω1 of tarsus I 22–25, ω3 of tarsus I 30–39, ω1 of tarsus II 20–26.

Differential diagnosis. Trouessartia savanae sp. nov. resembles T. secaticauda Gaud by having, in males, lobar lamellae terminating abruptly, truncate. It can be distinguished from the latter species by having epiandrium roughly square-shaped in males, and in females the external copulatory tube present. In males of T. secaticauda , the epiandrium is bow-shaped, and in females the external copulatory tube is absent.

Figures

FIGURE 10. Trouessartia savanae sp. nov., male. A—dorsal view; B—ventral view.

FIGURE 11. Trouessartia savanae sp. nov., female. A—dorsal view; B—ventral view.

FIGURE 12. Trouessartia savanae sp. nov.: tarsi I-IV of male (A – D) and female (E – H); I—spermatheca of female.