Trouessartia picumni, 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 picumni sp. nov.

( Figs. 13–15 )

Type-host: Picumnus fulvescens (Stager, 1961) ( Piciformes , Picidae ), Tawny Piculet.

Type-locality: Mata da Escola Agrícola de Jundiaí-UFRN, Macaíba, Rio Grande do Norte, Brazil.

Material examined. Male holotype, 14 males and 31 females ex Picumnus fulvescens (bird code #99), 1 male (#673), 2 males and 2 females (#47), 2 males and 2 females (#117), 1 female (#673), BRAZIL: Rio Grande do Norte, Macaíba, 5°53'S, 35°23'W, coll. H.M. Silva; 1 male and 1 female ex Picumnus temmincki Lafresnaye, 1845 (Picidae) (#Y-79, 788, 90-125), BRAZIL: São Paulo State, Jacupiranga, 24°41'34''S, 48°00'07''W, 0 8 February 1979, coll. Y. Oniki & E.O. Willis. Type specimen deposition: holotype and most paratypes at DZUnesp-RC; 2 male and 2 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 436 (430–454), greatest width of idiosoma at level of humeral shields 180 (175–185). Length of hysterosoma from sejugal furrow to bases of setae h3 294 (261–299). Prodorsal shield: length along midline 141 (142–159), greatest width of posterior part 148 (145–155), anterior end narrow and with conspicuous hump-like extension, 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 fused with anterior end of scapular shields, posterior margin uneven, slightly convex in median part, surface smooth without ornamentations ( Fig. 13 A). Vertical setae ve represented only by alveoli. Internal scapular setae si thin needle-like, 15 (16–26) long, separated by 49 (49–53); external scapular setae se 149 (135–147) long, separated by 95 (95–100). Humeral shield with setae c2 needle-like, 27 (27–31) long. Setae c3 narrowly lanceolate, acute apically, 23 (23–25) long. Dorsal hysterosoma with broadly connected prohysteronotal shield and lobar shield. Prohysteronotal shield: length 188 (180–195), width at anterior margin 146 (140–149), lateral margins with narrow incision at level of trochanters III, dorsal hysterosomal apertures (DHA) absent, lateral and posterior margins conspicuously darker than remaining area, central area without ornamentation. Dorsal setae c1, d1, d2 absent. Length of lobar shield excluding lamellae 98 (94–102). Apical parts of opisthosomal lobes approximate, separated by narrow parallel-sided terminal cleft, length of cleft from anterior end to apices of lamellae 66 (62–71), width in anterior part 19 (18–21). Lamellae semi-ovate, slightly attenuate apically, margins smooth, length from bases of setae h3 to lamellar apices 34 (29–35). Seta h2 225 (220–247) long, seta h3 147 (137–155) long. Distance between dorsal setae: h2: h3 31 (32–36), h2: h2 65 (58–61), h3: h3 50 (48–54).

Epimerites I free. Rudimentary sclerites rEpIIa small, irregularly shaped. Genital apparatus situated between levels of trochanters III, IV, length excluding basal sclerite 34 (35–38), greatest width 22 (20–23) ( Fig. 13 B). Epiandrum present. Setae g short, filiform, their alveoli separated. Postgenital plaque present. Adanal apodemes heavily sclerotized, without rounded apophyses. Translobar apodeme present. Adanal shields small, triangular, bearing setae ps3. Anal suckers 14 (13–16) in diameter, distance between centers of discs 25 (21–25). Epimerites IVa thin, triangular, anterior ends reaching level of setae 4a. Setae 4b situated slightly anterior to level of setae 3a, setae g slightly posterior to 4a. Distance between ventral setae 4b: 3a 30 (33–37), 4b: g 89 (83–91), g: ps3 44 (43–47), ps3: ps2 59 (54–59).

Legs IV extending by ambulacral disc to level of setae h3. Setae sR of trochanters III setiform, thickened basally, 26 (24–28) long. Modified setae d of tarsus IV barrel-shaped, with discoid cap, situated at distal third of segment; modified setae e hemispheroid, without cap, situated apically ( Fig. 15 D). Length of solenidia: σ1 of genu I 26 (24–27), σ of genu II 10 (7–11), σ of genu III 15 (12–14), ϕ of tibia I 63 (60–63), ϕ of tibia II 65 (63–67), ϕ of tibia III 60 (57–59), ϕ of tibia IV 36 (31–39), ω1 of tarsus I 18 (16–20), ω3 of tarsus I 30 (28–33), ω1 of tarsus II 20 (18–21).

Female (range for 5 paratypes). Length of idiosoma from anterior end to apices of lamellar lobar processes 498–555, greatest width 184–198. Length of hysterosoma from sejugal furrow to apices of lamellar lobar processes 340–378. Prodorsal shield: shaped as in male, 147–168 in length, 150–160 in width, surface without ornamentation ( Fig. 14 A). Vertical setae ve represented only by alveoli. Setae si thin needle-like, 16–24 long, separated by 53–59; setae se 125–155 long, separated by 95–108. Humeral shields with setae c2 needle-like, 32–34 long. Setae c3 narrowly lanceolate, acute apically, 23–28 in length. Hysteronotal shield: length from anterior margin to bases of setae h3 290–310, width at largest part near anterior margin 137–156, lateral margins with narrow incision at level of trochanters III, DHA absent, anterior part narrowly fused to scapular shields, surface without ornamentation, lateral and posterior parts conspicuously darker ( Figs 14 A). Dorsal setae c1, d1, d2, e1 absent in most specimens (d1 present as microsetae in both male and female from Picumnus temmincki ). Setae h1 short filiform, 5–9 long, situated anterior to bases of setae h2, 5–8 from each lateral margin of hysteronotal shield. Width of opisthosoma at level of setae h2 85–93. Setae ps1 positioned dorsally on opisthosomal lobes, closer to inner margins of lobes, and slightly closer to bases of h2 than to h3. Distance from bases of setae h3 to membranous apices of lobes 38–46. Setae f2 absent. Supranal concavity open posteriorly into terminal cleft. Length of terminal cleft together with supranal concavity 126–148, width of cleft at level of setae h 3 16–25. Interlobar membrane narrow. External copulatory tube absent. Spermatheca as in Fig. 15 I. Distance between dorsal setae: h2: h3 59–67, h2: h2 71–77, h3: h3 42–58, h1: h 2 8–13, h1: h1 66–70, ps1: h3 35:41.

Epimerites I free. Epigynum 41–51 in length, 82–98 in width ( Fig. 14 B). Epimerites IVa present, very thin. Setae sR of trochanters III setiform, thickened basally, 24–26 long. Legs IV extending by ambulacral disc to midlevel between setae h2 and h3. Length of solenidia: σ1 of genu I 22–28, σ of genu II 11–14, σ of genu III 11–14, ϕ of tibia I 61 –68, ϕ of tibia II 65 –70, ϕ of tibia III 56 –62, ϕ of tibia IV 11–14, ω1 of tarsus I 16–20, ω3 of tarsus I 28–35, ω1 of tarsus II 18–21.

Differential diagnosis. Trouessartia picumni sp. nov. resembles T. megadisca Gaud, 1962 by having, in males, translobar apodemes present, terminal lamellae entire, dorsal hysterosomal apertures (DHA) absent, setae d2 absent, and lateral margins of hysteronotal shield with incisions at level of trochanters III. The new species is clearly distinguishable from the latter, and also from all species of the genus by lacking dorsal setae d1, d2, and e 2 in both sexes. It is also unique in having the anterior end of the prodorsal shield strongly narrowed.

Figures

FIGURE 13. Trouessartia picumni sp. nov., male. A—dorsal view; B—ventral view.

FIGURE 14. Trouessartia picumni sp. nov., female. A—dorsal view; B—ventral view.

FIGURE 15. Trouessartia picumni sp. nov.: tarsi I-IV of male (A – D) and female (E – H); I—spermatheca of female.