Tyrannidectes sealyi, Mironov & Galloway, 2021

Mironov, Sergey V. & Galloway, Terry D., 2021, Feather mites of the subfamily Pterodectinae (Acariformes: Proctophyllodidae) from passerines and kingfishers in Canada, Zootaxa 5016 (1), pp. 1-55 : 28-32

Tyrannidectes sealyi sp. n.

( Figs. 15–17 )

Type material. Male holotype, 14 males, 18 females from the Eastern Kingbird, Tyrannus tyrannus (Linnaeus, 1758) ( Passeriformes : Tyrannidae ), (EAKI/166/CEN/15, SM 2563), CANADA, Manitoba, Winnipeg, Hadashville, 19 May 2015, coll. T.D. Galloway and R.K. Loch.

Depository. Holotype, 5 male and 5 female paratypes — CNC, remaining paratypes — WRME and ZISP.

Additional material. 20 males, 14 females from the Western Kingbird, Tyrannus verticalis Say, 1822 (Tyrannidae) (SM 1938), CANADA, Manitoba, Winnipeg, Warren , 22 August 2009, coll. T.D. Galloway and J.A. McLeod.

Description. MALE (holotype, range for 10 paratypes in parentheses) ( Figs. 15 , 17 A-E). Idiosoma, length × width, 385 (370–395) × 180 (150–180), length of hysterosoma 240 (240–250). Prodorsal shield: entire; anterolateral extensions short, acute, in some specimens bidentate; lateral margins straight, posterior margin with a pair of wide and shallow concavities, posterior corners pointed, surface without ornamentation, length 115 (110–120), width 125 (120–135). Setae ve rudimentary, represented by alveoli. Bases of scapular setae se separated by 60 (60–68). Scapular shields narrow, not developed dorsally. Humeral shields absent. Bases of setae cp and c2 situated on striated tegument. Subhumeral setae c3 lanceolate, 28 (25–28) long, about 7.5 (7.5–8) wide. Hysteronotal shield: anterior margin strongly concave, anterior corners rounded, surface without ornamentation, greatest length 230 (230–240), width at anterior margin 110 (100–115). Distance between prodorsal and hysteronotal shields 40–50. Opisthosomal lobes as long as wide at base; posterior margins roughly rounded, with slight extensions at bases of setae h2 and h3. Terminal cleft shaped as an inverted U with widely divergent branches, 30 (28–32) long. Supranal concavity semicircular. Setae f2 anterior to bases of setae ps2. Setae h1 situated at level of supranal concavity. Setae h3 setiform, 70 (58–70) long; setae ps2 100 (85–100) long. Setae ps1 filiform, about 5 long, distant from margin of terminal cleft, situated at level of setae ps2. Distances between dorsal setae: c2:d2 93 (90–95), d2:e2 93 (92–98), e2:h3 45 (45–48), d1:d2 22 (20–25), e1: e2 43 (40–50), h1:ps2 22 (22–27), h2:h2 59 (53–60), h3:h3 43 (38–44), ps2:ps2 73 (67–72).

Epimerites I fused into a U strongly narrowed in posterior part, fused part with a pair of short and rounded lateral extensions and small and rounded median extension. Coxal fields I, II without extensively sclerotized areas. Rudimentary sclerites rEpIIa absent. Coxal fields I–III open. Coxal fields IV without sclerotized areas at bases of trochanters IV. Epimerites IVa absent. Genital arch of moderate size, 28 (25–28) × 50 (48–50); aedeagus swordshaped, 75 (73–76) long, not extending to anterior end anal slit; basal sclerite of genital apparatus small semicircular ( Fig. 17A ). Genital papillae not connected at bases. Genital and adanal shields absent. Adanal suckers 15 (15–16) in diameter, corolla with 9–10 denticles, surrounding membrane with radial striae. Opisthoventral shields on lateral areas of opisthosomal lobes with setae ps3 on inner margin and with triangular extension posterior to bases of these setae; distal half of opisthosomal lobes not sclerotized. Setae 4b situated posterior to level of setae 3a, setae ps3 at level of posterior margin of adanal suckers. Distance between ventral setae: 3a:4b 7 (7–9), 4b:4a 42 (40–45), 4a:g 43 (40–45), g:ps3 63 (62–65), ps3:ps3 75 (70–77), ps3:h3 25 (22–26).

Femora I, II with narrow ventral crests, other segments of legs I, II without processes ( Fig. 17B, C ). Solenidion σ of genu I half the length of this segment and situated in its posterior part. Genual setae cG I, II and mG I filiform, setae mG II slightly thickened basally. Setae d and f of tarsus II subequal in length, seta d of tarsus III much shorter than corresponding seta f. Solenidion φ of tibia IV extending to midlevel of ambulacral disc. Tarsus IV 37 (32–37) long, without apical process; setae d, e button-like, seta d slightly closer to base of this segment ( Fig. 17E ). Length of solenidia: ω1 I 15 (14–15), ω1 II 12 (10–12), σ I 15 (15–20), σ III 10 (10–15), φ IV 50 (50–54).

FEMALE (range for 10 paratypes) ( Figs. 16 , 17F, G ). Idiosoma, length × width, 540–580 × 215–225, length of hysterosoma 375–390. Prodorsal shield: entire; anterolateral extension long, pointed; lateral margins slightly concave at level of scapular setae, posterior margin shaped as wide blunt angle; posterior corners pointed; surface without ornamentation, 135–145 × 140–155. Setae ve rudimentary, represented by alveoli. Bases of setae se separated by 80–88. Scapular shields narrow, not developed dorsally. Humeral shields rudimentary, represented by small plates anterior to bases of setae cp. Setae cp and c2 situated on striated tegument. Setae c3 lanceolate, 28–30 long, 8–10 wide. Distance between prodorsal and hysteronotal shields 60–80. Anterior and lobar parts of hysteronotal shield separated dorsally by narrow transverse band of soft tegument. Anterior hysteronotal shield nearly rectangular, anterior margin strongly concave, surface without ornamentation, greatest length 280–285, width at anterior margin 135–150 ( Fig. 16A ). Length of lobar region 95–100, greatest width 92–100. Terminal cleft narrow, parallel-sided with lateral margins almost touching, 70–80 long. Lobar shield entire, anterior margin almost straight, posterior margin with large median incision almost separating this shield into two pieces, surface without ornamentation. Supranal concavity absent. Setae h1 at level of anterior end of terminal cleft; setae h1 and f2 arranged in a low trapezoid. Setae h2 spindle-like, 65–72 × 9–10. Setae ps1 situated closer to inner margins of opisthosomal lobes than to outer ones, close to lobar apices. Setae h3 8–11 long, about 1/8th the length of terminal appendages. Distances between dorsal setae: c2:d2 120–130, d2:e2 130–150, e2:h2 55–60, h2:h3 35–48, d1:d2 25–35, e1: e2 60–70, h1:h2 20–28, h1:h1 30–35, h2:h2 70–77, h2:ps1 25–30.

Epimerites I fused into a narrow U with divergent anterior ends, fused part without narrow median extension ( Fig. 16B ). Lateral parts of coxal fields I, II without extensive sclerotized areas. Epimerites IVa indistinct. Translobar apodemes of opisthosomal lobes wide, not fused to each other anterior to terminal cleft. Epigynum with small lateral ledges, greatest width 80–95; apodemes of oviporus free from epimerites IIIa. Pseudanal setae filiform, setae ps2 situated at level of posterior half of anal slit and widely separated from each other; distance between pseudanal setae: ps2:ps2 50–54, ps3:ps3 22–30, ps2:ps3 30–38. Head of spermatheca conical, proximal one third of primary spermaduct moderately enlarged near head of spermatheca; secondary spermaducts about 25–30 long ( Fig. 17G ).

Legs I, II as in male. Solenidion σ of genu I approximately half the length of this segment and situated closer to its base. Genual setae cG I, II, mG I, II as in male. Setae d and f of tarsi II subequal, setae d of tarsi III, IV much shorter than corresponding setae f. Genu IV dorsally inflated, with narrow dorsal crest. Lengths of solenidia: ω1 I 17–20 ω1 II 12–16, σ I 18–23, σ III 11–15, φ III 32–45, φ IV 12–15.

Differential diagnosis. Tyrannidectes sealyi sp. n. is closest to T. pitangi (Mironov, 2008) from the Great Kiskadee, Pitangus sulphuratus (Linnaeus, 1766) (Tyrannidae) , in having the following: in both sexes, genual solenidia σ III and trochanteral setae sR III present, the anterior margin of the hysteronotal shield concave; in males, setae h3 long, filiform, and the aedeagus not extending to the level of the adanal suckers. Tyrannidectes sealyi differs from that species by the following features in both sexes, the lateral margins of the hysteronotal shield lack any incisions; in males, the posterior corners of the prodorsal shield are pointed and tibial solenidion φ IV is about 1.5 times longer than the corresponding tarsus; in females, setae h1 are situated at the level of the anterior end of the terminal cleft. In both sexes of T. pitangi , the lateral margin of the prodorsal shield has narrow incisions extending to bases of setae si (in males) or wide triangular incisions that completely encompass setae se (in females); in males, the posterior corners of the prodorsal shield are roughly rounded and tibial solenidion φ IV is 2.5–2.8 times longer than tarsus IV; in females, setae h1 are approximately equidistant from the anterior margin of the lobar shield and the level of anterior end of the terminal cleft.

Remark. Specimens of Pterodectinae were collected by McKenzie and MacKenzie (1981) from Tyrannus tyrannus and T. verticalis from Delta Marsh, Manitoba. Specimens were not identified further than to subfamily because of an absence of male specimens. It is almost certain that their specimens were T. sealyi .

Etymology. The species is named in honor of Professor Emeritus Spencer G. Sealy, a retired ornithologist in the Department of Biological Sciences at the University of Manitoba (Winnipeg). Spencer generously provided his expertise to make sure birds included in our studies were correctly identified.

Figures

FIGURE 15. Tyrannidectes sealyi sp. n., male. A—dorsal view, B—ventral view.

FIGURE 16. Tyrannidectes sealyi sp. n., female. A—dorsal view, B—ventral view.

FIGURE 17. Tyrannidectes sealyi sp. n., details.A—opisthosoma of male, ventral view, B–D—legs I–III of male, respectively, E—tibia and tarsus IV of male, F—tibia and tarsus IV of female, G—spermatheca and spermaducts.Abbreviation: ag—angular extension of opisthoventral shield.