Trouessartia progne 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 : 19-23

Trouessartia progne Mironov and Galloway , sp. n.

( Figs. 10–12 )

Type material. Holotype male ( CNC758976 ), 10 male and 10 female paratypes from Progne subis (Linnaeus, 1758) ( Passeriformes : Hirundinidae ), CANADA, Manitoba, Winnipeg , 2 June 2011, coll. T.D. Galloway and Z.D.L. Rempel.

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. 10 , 12 A–F). Length of idiosoma from anterior end to lobar apices excluding lamellae 375 (370–400), width of idiosoma at level of humeral shields 150 (150–170). Length of hysterosoma from level of sejugal furrow to lobar apices 250 (245–265). Prodorsal shield: length along midline 117 (115–125), greatest width posterior to level of scapular setae 135 (130–140), anterior part at level of trochanters II not narrowed, antero-lateral extensions fused with bases of epimerites Ia between legs I and II, lateral margins fused with antero-mesal angles of scapular shields, posterior margin straight, surface without ornamentation. Internal scapular setae si narrowly lanceolate, 11 (10–12) long, separated by 50 (50–52); external scapular setae se separated by 92 (90–98). Setae c2 short spiculiform, 10 (10–13) long, situated in antero-median angle of humeral shields. Setae c3 spiculiform, with acute apex, 18 (15–18) long. Hysteronotal shield separated into prohysteronotal and lobar parts connected by a pair of very thin commissures; total length of shield from anterior margin to lobar apices excluding lamellae 245 (340–265). Prohysteronotal shield: length along midline 160 (155–175), width at anterior margin 125 (120–130), lateral margins shallowly concave at level of trochanters III, DHA present, surface without ornamentation, supranal concavity with strong sclerotization. Dorsal setae d1, d2, e2 present. Lobar shield almost completely separated in two pieces, their antero-mesal angles bearing heavily sclerotized bean-shaped patches and connected each other by thin transverse commissure; length of lobar shield excluding terminal lamellae 88 (85–90). Opisthosomal lobes several times longer than wide, widely separated by semi-ovate terminal cleft strongly narrowed anteriorly; length of cleft from anterior end to lobar apices (bases of setae h3) 83 (80–90), greatest width 43 (42–50). Terminal lamellae semi-ovate, widely rounded posteriorly, with smooth margins, length from bases of setae h3 to lamellar apices 15 (12–55), greatest width 23 (22–25). Distance between dorsal setae: c2:d2 60 (60–68), d2:e2 85 (82–90), e2:h2 75 (72–82), h2:h3 15 (15–18), h2:h2 73 (72–87), h3:h3 60 (60–73), d1:d2 42 (42–48), e1: e2 42 (42–45), h1:h2 10 (10–13), ps1:h3 8 (7–10).

Epimerites I free. Rudimentary sclerites rEpIIa roughly triangular in shape. Genital apparatus situated between levels of trochanters III and IV, length excluding basal sclerite 30 (30–38), greatest width 20 (18–22). Epiandrum present. Latigenital sclerites absent. Anterior and posterior genital papillae equal in size, members of posterior pair more distant from midline. Setae g long, filiform, with not touching at bases. Genital shield absent. Adanal apodemes heavily sclerotized, fused with epimerites IVa, without apophyses. Lateral margins of opisthosoma with distinct lateral membranes. Translobar apodeme absent. Adanal shields bearing setae ps3 shaped as small longitudinal sclerites with rounded ends. Anal suckers 10 (10–13) in diameter. Epimerites IIIa with apices extending beyond level of setae cp; their inner margin with narrow and acute extensions directed backward to level of genital arch apex. Setae 4b situated slightly posterior to level of setae 3a; setae g not touching at bases, situated approximately at level of setae 4a. Distance between ventral setae: 3a:4b: 4 (2–5), 4b:g 50 (50–58), g:4a 2.5 (1–4), g:ps3 73 (72–78), ps3:h3 68 (67–73).

Setae cG, mG of genua I, II filiform. Genual solenidia σ 1 I, σ II situated in basal part of corresponding segments. Trochanteral setae sR III spiculiform, with acute apex, 15 (13–15) long. Legs IV with ambulacral disc extending to midlevel between setae h2 and h3.Tarsus IV 25 (25–28) long; modified setae d barrel-shaped, with discoid cap, situated slightly closer to base of tarsus; setae e button-shaped, without discoid cap, situated apically ( Fig. 12D ). Length of solenidia: σ 1 I 18 (17–20), σ II 6 (6–8), σ III 15 (13–15), φ IV 18 (17–19).

FEMALE (range for 10 paratypes) ( Fig. 11 , 12G, H ). Length of idiosoma from anterior end to apices of hyaline lobar processes 410–450, width at level of humeral shields 150–170. Length of hysterosoma from level of sejugal furrow to apices of lobar processes 285–315. Prodorsal shield: shaped as in male, 120–125 long, 130–140 wide, surface without ornamentation. Setae si thin spiculiform, 13–15 long, separated by 52–55; setae se separated by 95–102. Setae c2 spiculiform, 13–15 long, situated in antero-medial angle of humeral shields. Setae c3 spiculiform, with acute apex, 15–23 long. Hysteronotal shield: length from anterior margin to bases of setae h3 275–200, width at anterior margin 125–135, lateral margins without incisions, DHA present, surface from level of setae cp to setae h2 with numerous ovate lacunae, with most large-sized at level of trochanters IV. Dorsal setae d1 present. Setae f2 present. Setae h1 narrowly lanceolate, 23–28 long, situated antero-mesal to bases of setae h2, 12–14 from corresponding lateral margins of hysteronotal shield. Width of opisthosoma at level of setae h2 72–80. Setae ps1 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 110–125, width of cleft at level of setae h 3 25–30. Interlobar membrane occupying anterior 1/5th of terminal cleft, distance from free margin of this membrane to lobar apices 67–80. External copulatory tube short, conical in shape, truncate apically, situated on free margin of interlobar membrane, 7–10 long. Distance between dorsal setae: c2:d2 67–70, d2:e2 87– 95, e2:h2 47–53, h2:h3 52–62, h2:h2 57–63, h3:h3 37–42, d1:d2 40–45, e1: e 2 30–35, h1:h 2 8–12, h1:h1 37–40, ps1:h 3 8–11.

Epimerites I free. Epigynum 32–35 long, 70–75 wide ( Fig. 11B ). Head of spermatheca with short collar, without denticles, primary spermaduct without enlargement proximally, with distal end straight, secondary spermaducts 24–28 long ( Fig. 12H ). Inner margins of epimerites IIIa with long and acute extensions directed posteromesal. Epimerites IVa represented by longitudinal sclerites. Anal opening with a pair of small adanal sclerites.

Legs I, II as in males. Trochanteral setae sR III spiculiform, acute apically, 15–20 long. Legs IV with ambulacral disc extending to midlevel between setae h2 and h3. Length of solenidia: σ 1 I 22–25, σ II 7.5–10, σ III 15–18.

Differential diagnosis. The new species, Trouessartia progne sp. n., is closest to T. stelgidopteryx in having the opisthosomal lobes widely separated by the terminal cleft and tarsal setae d IV situated in the distal half of the segment in males, setae h1 narrowly lanceolate, and the external copulatory tube situated on the margin of the interlobar membrane in females. Trouessartia progne differs from T. stelgidopteryx by the characters as follows: in both sexes, the prodorsal shield is fused with the antero-mesal angles of the scapular shields; in males, the prohysteronotal and lobar shields are connected by a pair of thin commissures and lack ornamentation, and setae g are situated anterior to the level of setae 4a; in females, the external copulatory tube has a truncate apex, and setae h1 are shorter (25–28 µm) and do not extend beyond the tip of the external copulatory tube. In both sexes of T. stelgidopteryx , the prodorsal shield is not fused with the scapular shields; in males, the prohysteronotal and lobar shield are completely separated and bears a faint network pattern in the central part, and setae g are situated slightly posterior to the level of setae 4a; in females, the tip of the external copulatory tube is acute, and setae h1 are longer (35–38 µm) and extend beyond the tip of the external copulatory tube.

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

Figures

FIGURE 10. Trouessartia progne sp. n., male. A—dorsal view, B—ventral view.

FIGURE 11. Trouessartia progne sp. n., female. A—dorsal view, B—ventral view.

FIGURE 12. Trouessartia progne 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.