Trouessartia bochkovi Mironov and Galloway, 2019

Mironov, Sergey V. & Galloway, Terry D., 2019, Feather mites of the genus Trouessartia Canestrini (Acariformes: Trouessartiidae) from swallows (Passeriformes: Hirundinidae) in Canada, Zootaxa 4568 (1), pp. 1-39 : 11-15

Trouessartia bochkovi Mironov and Galloway , sp. n.

( Figs. 4–6 )

Type material. Holotype male (CNC758974), 10 male and 10 female paratypes from Tachycineta bicolor (Vieillot, 1808) ( Passeriformes : Hirundinidae ), CANADA, Manitoba, no exact location, 7–14 June 2001, coll. T.D. Galloway.

Depositories: Holotype, 4 male and 4 female paratypes—CNC, remaining paratypes—BMOC, WRME and ZISP.

Description. MALE (holotype, ranges for 10 paratypes in parentheses) ( Figs. 4 , 6 A–F). Length of idiosoma from anterior end to lobar apices excluding lamellae 470 (430–470), width of idiosoma at level of humeral shields 210 (200–215). Length of hysterosoma from level of sejugal furrow to lobar apices 310 (285–325). Prodorsal shield: length along midline 145 (130–145), greatest width posterior to level of scapular setae 160 (155–175), anterior part at level of trochanters II not narrowed, antero-lateral extensions not fused with bases of epimerites Ia between legs I and II, lateral margins not fused with scapular shields, posterior margin straight, surface without ornamentation. Internal scapular setae si spiculiform, 20 (18–20) long, separated by 58 (57–60); external scapular setae se separated by 110 (100–115). Setae c2 spiculiform, 20 (15–20) long, situated in antero-median angle of humeral shields. Setae c3 narrowly lanceolate, with acute apex, 20 (18–22) long. Hysteronotal shield completely separated into prohysteronotal and lobar parts, total length from anterior margin to lobar apices excluding lamellae 305 (275–315). Prohysteronotal shield: length along midline 185 (175–195), width at anterior margin 175 (165– 180), lateral margins shallowly concave at level of trochanters III, dorsal hysterosomal apertures (DHA) present, central area with small ovate lacunae. Dorsal setae d1, d2, e2 present. Length of lobar shield excluding terminal lamellae 125 (110–125). Opisthosomal lobes several times longer than wide, separated by broad semi-ovate terminal cleft; length of cleft from anterior end to lobar apices (bases of setae h3) 120 (110–120), greatest width at level of setae h2 90 (68–90). Terminal lamellae semicircular, with widely rounded and smooth posterior margin, length from bases of setae h3 to lamellar apices 20 (28–20), greatest width 38 (35–40). Distance between dorsal setae: c2:d2 77 (72–78), d2:e2 100 (95–110), e2:h2 100 (95–105), h2:h3 25 (20–25), h2:h2 130 (110–130), h3:h3 112 (100–115), d1:d2 50 (50–55), e1: e2 42 (40–48), h1:h2 15 (15–18), ps1:h3 18 (15–18).

Epimerites I free. Rudimentary sclerites rEpIIa small, semi-ovate, with acute inner angles. Genital apparatus situated between levels of trochanters III and IV, length excluding basal sclerite 43 (40–48), greatest width 30 (27– 30). Epiandrum (pregenital sclerite) present. Latigenital apodemes absent. Genital shield absent. Anterior and posterior genital papillae equal in size and situated approximately equidistant from midline. Setae g long, filiform, with bases distinctly separated. Adanal apodemes heavily sclerotized, without apophyses, with vestigial lateral membranes. Translobar apodeme absent. Adanal shields bearing setae ps3 shaped as small longitudinal sclerites with acute anterior ends. Anal suckers 15 (12–15) in diameter. Inner ends of epimerites IIIa with apices extending beyond levels of setae 3a and 4b and with narrow and short blunt-angular extensions on posterior margins. Setae 4b situated slightly posterior to level of setae 3a; setae g and 4a situated same transverse level. Distance between ventral setae: 4b:3a 8 (8–12), 4a:g 62 (60–68), g:ps3 82 (80–92), ps3:h3 92 (85–92).

Setae cG, mG of genua I, II filiform. Genual solenidia σ 1 I and σ II situated at midlenth of corresponding genua. Legs IV with ambulacral disc extending level of setae h2. Trochanteral setae sR III narrowly lanceolate, with acute apex, 18 (13–18) long. Tarsus IV 35 (33–35) long; modified setae d barrel-shaped, with discoid cap, situated in distal one thirds of this segment; modified setae e button-like, without cap, situated apically ( Fig. 6D ). Length of solenidia: σ 1 I 35(30–35), σ II 8 (8–10), σ III 20 (15–20), φ IV 23 (23–28).

FEMALE (range for 10 paratypes) ( Figs. 5A, B , 6G, H ). Length of idiosoma from anterior end to apices of hyaline lobar processes 510–565, width at level of humeral shields 205–235. Length of hysterosoma from level of sejugal furrow to apices of lobar processes 360–395. Prodorsal shield: shaped as in male, 145–155 long, 170–185 wide, surface with barely distinct network of ornamentation. Setae si spiculiform, 20–22 long, separated by 63–70; setae se separated by 120–125. Setae c2 thin spiculiform, 20–23 long, situated in antero-medial angle of humeral shields. Setae c3 narrowly lanceolate, with acute apex, 20–25 long. Hysteronotal shield: length from anterior margin to bases of setae h3 335–385, width at anterior margin 170–190, lateral margins shallowly concave at level of trochanters III, DHA present, most area from level of setae cp to supranal concavity with numerous ovate lacunae. Dorsal setae d1, d2, e2 present. Setae f2 present. Setae h1 narrowly lanceolate, about 32–42 long, situated antero-mesal to bases of setae h2, 13–18 from corresponding lateral margins of hysteronotal shield. Width of opisthosoma at level of setae h2 97–110. Setae psl positioned dorsal, equidistant from outer and inner margins of opisthosomal lobes. Supranal concavity open posteriorly into terminal cleft. Length of terminal cleft from anterior margin to lobar apices 112–132, length from free margin of interlobar membrane to apices 97 (92–105), width of cleft at level of setae h3 37–43. Interlobar membrane occupying anterior 1/6th of terminal cleft. External copulatory tube short cone-shaped, situated on free margin of interlobar membrane. Distance between dorsal setae: c2:d2 77–82, d2:e2 105–118, e2:h2 52–62, h2:h3 63–77, h2:h2 78–88, h3:h3 57–63, d1:d2 55–60, e1: e2 47–50, h1:h 2 15–18, h1:h1 55–63, ps1:h 3 12–13.

Epimerites I free. Epigynum 32–40 long, 85–98 wide ( Fig. 5B ). Head of spermatheca with short non-dentate collar and few rounded denticles ( Fig. 6H ), primary spermaduct without enlargements, secondary spermaducts 35– 40 long. Inner margins of epimerites IIIa with finger-like acute extension. Epimerites IVa narrow. Anal opening with small adanal sclerites near anterior end.

Legs I, II as in males. Trochanteral setae sR III narrowly lanceolate, acute apically, 15–18 long. Legs IV with ambulacral disc extending to level of setae ps1. Length of solenidia: σ 1 I 30–32, σ II 10–12, σ III 20–22.

Differential diagnosis. Among previously described species, Trouessartia bochkovi sp. n. is close to T. stelgidopteryx Mironov and Overstreet 2016 and T. progne sp. n. (described below), in having the opisthosomal lobes long and widely separated by the terminal cleft and the absence of epimerites IVa in males. Trouessartia bochkovi differs from these species ( T. stelgidopteryx , T. progne ) by the characters as follows: in males, the terminal cleft is approximately as long as the greatest width, the length of the idiosoma is significantly longer (430–470 µm), the prohysteronotal shield bears numerous small ovate lacunae, the distance between setae ps3 exceeds the distance between setae 4a; in females, setae h2 are situated anterior to the free margin of the interlobar membrane, setae h1 extend to or slightly beyond the tip of the external copulatory tube, and the length of idiosoma is 510–565 µm. In males of T. stelgidopteryx , the terminal cleft is 1.5 times longer than the greatest width, the length of the idiosoma is 380–420 µm, the prohysteronotal shield bears a faint network ornamentation, the distance between setae ps3 are shorter than that between setae 4a; in females, setae h2 are situated at the level of interlobar membrane free margin, setae h1 extend far beyond the tip of the external copulatory tube, and the length of idiosoma is 430–465 µm.

Etymology. The species is named after the world renowned acarologist Andrei V. Bochkov, Saint Petersburg, Russia (28 August 1968 – 9 May 2018).

Figures

FIGURE 4. Trouessartia bochkovi sp. n., male. A—dorsal view, B—ventral view.

FIGURE 5. Trouessartia bochkovi sp. n., female. A—dorsal view, B—ventral view.

FIGURE 6. Trouessartia bochkovi sp. n., details. A, B—genu, tibia and tarsus I and II of male, respectively, C, D—tibia and tarsus III and IV of male, respectively, E—genital apparatus and opisthosoma of male, ventral view, F—setae si, c2, c3 and sRIII of male, G—tibia and tarsus IV of female, H—spermatheca and spermaducts. Abbreviations: ad—adanal apodeme, eaepiandrum, bs—basal sclerite, is—intermedial sclerite, lm—lateral membrane, pm—paramere, tl—terminal lamella.