Trouessartia sicaliae, 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 sicaliae sp. nov.

( Figs. 4–6 )

Type-host: Sicalis flaveola (Linnaeus, 1766) ( Passeriformes , Emberizidae ), Saffron Finch.

Type-locality: Guaratuba, Paraná, Brazil.

Material examined. Male holotype, 16 male and 14 female paratypes ex Sicalis flaveola , BRAZIL: Guaratuba, Paraná, 25º45’S, 48º43’W, 21 November 2012, coll. C.O.A. Gussoni. Type specimen deposition: holotype and most paratypes at DZUnesp-RC; 1 male and 1 female paratypes at each DZSJRP, OSAL, UMMZ, ZISP.

Etymology. The specific epithet is taken from the generic name of the 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 473 (477–484), greatest width of idiosoma at level of humeral shields 237 (233–244). Length of hysterosoma from sejugal furrow to bases of setae h3 316 (329–329). Prodorsal shield: length along midline 148 (146–152), greatest width of posterior part 181 (172–184), anterior part at level of trochanters II not narrowed, antero-lateral extensions almost extending to bases of epimerites Ia between legs I and II, lateral margins not fused with scapular shields, posterior margin almost straight, surface with faint network pattern ( Fig. 4 A). Vertical setae ve represented only by alveoli. Internal scapular setae si thin needle-like, 29 (23–28) long, separated by 69 (64–69); external scapular setae se 172 (159–200) long, separated by 116 (94–114). Humeral shield with setae c2 needlelike, 39 (45–51) long. Setae c3 narrowly lanceolate, with acute apex, 26 (27–31) long. Dorsal hysterosoma with prohysteronotal and lobar shields completely separated. Prohysteronotal shield: length 185 (188–189), width at anterior margin 178 (172–181), lateral margins shallowly incised at level of trochanters III, dorsal hysterosomal apertures (DHA) absent, central area with faint oval lacunae. Dorsal setae d1, d2 present, minute. Length of lobar shield excluding lamellae 110 (109–113). Apical parts of opisthosomal lobes approximate, separated by narrow parallel-sided terminal cleft, length of cleft from anterior end to apices of lamellae 62 (56–64), width in anterior part 9 (7–10). Lamella slightly attenuate apically, with smooth margins, length from bases of setae h3 to lamellar apices 36 (37–40). Seta h2 267 (247–264) long, seta h3 184 (152–194) long. Distance between dorsal setae: c2: d2 91 (89–98), d2: e2 104 (103–106), e2: h2 89 (88–96), h2: h3 24 (26–28), h2: h2 46 (44–48), h3: h3 36 (33–39), d1: d2 46 (45–49), e1: e2 40 (39–47).

Epimerites I free. Rudimentary sclerites rEpIIa present, faint. Genital apparatus situated between levels of trochanters III, length excluding basal sclerite 57 (54–61), greatest width 26 (24–26) ( Fig. 4 B). Epiandrum present, small, connected to anterior part of genital apparatus. Setae g long, thickened, inserted anterior to level of 4a.

Postgenital plaque present. Adanal apodemes heavily sclerotized, without rounded apophyses. Translobar apodeme present. Adanal shields absent, setae ps3 inserted on soft tegument anterior to anal suckers. Anal suckers 13 (11–14) in diameter, distance between centers of discs 21 (20–23). Epimerites IVa small, thin, anterior ends barely reaching level of setae 4a. Setae 4b situated slightly anterior to level of setae 3a, setae g situated anterior to level of 4a. Distance between ventral setae 4b: 3a 45 (46–50), 4b: g 85 (84–89), g: ps3 73 (73–78), ps3: ps2 52 (52–60).

Legs IV extending by ambulacral disc to level of setae h3. Setae sR of trochanters III short, narrowly lanceolate, acute apically, 21 (19–24) long. Modified setae d of tarsus IV barrel-shaped, with discoid cap, situated at basal half of segment; modified setae e hemispheroid, without cap, situated apically ( Fig. 6 D). Length of solenidia: σ1 of genu I 48 (46–59), σ of genu II 11 (11–13), σ of genu III 26 (18–24), ϕ of tibia I 83 (78–84), ϕ of tibia II 91 (88–92), ϕ of tibia III 74 (66–71), ϕ of tibia IV 45 (40–45), ω1 of tarsus I 25 (20–24), ω3 of tarsus I 35 (32–38), ω1 of tarsus II 30 (24–26).

Female (range for 5 paratypes). Length of idiosoma from anterior end to apices of lamellar lobar processes 544–564, greatest width 218–248. Length of hysterosoma from sejugal furrow to apices of lamellar lobar processes 375–396. Prodorsal shield: shaped as in male, 152–171 in length, 183–196 in width, surface with faint network pattern ( Fig. 5 A). Vertical setae ve represented only by alveoli. Setae si thin needle-like, 17–27 long, separated by 70–81; setae se 139–159 long, separated by 120–130. Humeral shields with setae c2 needle-like, 38–54 long. Setae c3 narrowly lanceolate, acute apically, 25– 23 in length. Hysteronotal shield: length from anterior margin to bases of setae h3 310–323, width at largest part near anterior margin 176–185, lateral margins incised at level of trochanters III, DHA absent, anterior part with faint circular and oval ornamentation, posterior part with narrow ovate lacunae. Dorsal setae d1, d2 present. Setae h1 thick, lanceolate, 37–42 long, situated antero-mesal to bases of setae h2, 21–23 from each lateral margin of hysteronotal shield. Width of opisthosoma at level of setae h2 85–93.

Setae ps1 positioned dorsally on opisthosomal lobes, equidistant from bases of setae h2 and h2, and equidistant from outer and inner margins of lobe. Distance from bases of setae h3 to membranous apices of lobes 50–60. Setae f2 absent. Supranal concavity open posteriorly into terminal cleft. Length of terminal cleft together with supranal concavity 136–142, width of cleft at level of setae h 3 28–38. Interlobar membrane occupying anterior 1/4 of terminal cleft. External copulatory tube present, protruding from free margin of interlobar membrane, attenuated apically, 51–60 long. Spermatheca as in Fig. 6 I. Distance between dorsal setae: c2: d2 93–106, d2: e 2 97 –103, e2: h2 62–69, h2: h3 54–60, h2: h2 62–73, h3: h3 50–60, d1: d2 49–54, e1: e2 35 –47, h1: h 2 23–26, h1: h1 34–41, ps1: h3 27:32.

Epimerites I free. Epigynum 50–54 in length, 98–112 in width ( Fig. 5 B). Epimerites IVa present, small. Anal opening with pair of small irregular sclerites situated at level of its anterior end. Setae sR of trochanters III lanceolate, acute apically, 21–22 long. Legs IV extending by ambulacral disc to level of setae h3. Length of solenidia: σ1 of genu I 44 –50, σ of genu II 12–14, σ of genu III 23–28, ϕ of tibia I 77 –84, ϕ of tibia II 87 –92, ϕ of tibia III 67 –74, ϕ of tibia IV 24–36, ω1 of tarsus I 22–27, ω3 of tarsus I 30–39, ω1 of tarsus II 24–27.

Differential diagnosis. Trouessartia sicaliae sp. nov. is close to T. capensis Berla by having, in males, setae h3 and h2 about the same length, lamella margins smooth; and in females, setae ps1 inserted mid-way between h3 and h2, and external copulatory tube attenuate apically. The new species can be distinguished from the latter species by having, in males, setae g anterior to the level of 4a, and in females, setae h1 relatively shorter, not reaching the posterior margin of interlobar membrane. In males of T. capensis , setae g are inserted clearly posterior to 4a, and in females, the tips of setae h1 surpass the posterior margin of interlobar membrane.

Figures

FIGURE 4. Trouessartia sicaliae sp. nov., male. A—dorsal view; B—ventral view.

FIGURE 5. Trouessartia sicaliae sp. nov., female. A—dorsal view; B—ventral view.

FIGURE 6. Trouessartia sicaliae sp. nov.: tarsi I-IV of male (A – D) and female (E – H); I—spermatheca of female.