Trouessartia, Canestrini, 1899

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 : 4-5

Key to Trouessartia species from Hirundinidae in North America

(Males and females)

1. In both sexes, setae d2, e2 absent; setae sR III filiform, setae c2 lanceolate and always short (15–20 µm). Male: epimerites IVa long and extending to base of genital apparatus. ( minutipes group)............................................. 2

- In both sexes, setae d2, e2 present; setae sR III narrowly lanceolate or spiculiform, setae c2 spiculiform or with narrowly lanceolate enlargement in basal part, variable in length. Male: epimerites IVa not extending to base of genital apparatus....... 4

2. Female: distal part of primary spermaduct zigzag-shaped, its vertical bend situated at level of setae h2, copulatory opening shaped as wide transverse slit situated at free margin of interlobar membrane ( Fig. 21G ). Male: distal end of aedeagus Sshaped and extending far beyond tips of parameres ( Fig. 19D )............................. T. ripariae Mironov, 1983

- Female: distal part of primary spermaduct straight, not enlarged terminally; copulatory opening small and situated at free margin of interlobar membrane. Male: distal end of aedeagus not extending beyond tips of parameres.................... 3

3. In both sexes, posterior part of prodorsal shield with numerous small circular lacunae, setae si slightly enlarged in basal part ( Fig. 13A , 14A ). Male: rudimentary sclerites rEpIIa narrow, L-shaped, length of terminal lamellae 20–25 µm ( Fig. 13B ). Female: proximal part of primary spermaduct gradually enlarging to head of spermatheca ( Fig. 15H )...................................................................................................... T. petrochelidon sp. n.

- In both sexes, posterior part of prodorsal shield without ornamentation or with barely distinct ornamentation of lacunae, setae si thin spiculiform ( Fig. 18A ). Male: rudimentary sclerites rEpIIa with rounded lateral margin and pair of acute inner angles, length of terminal lamellae 15–18 µm ( Fig. 18B ). Female: primary spermaduct with abrupt enlargement between head of spermatheca and secondary spermaducts ( Fig. 21D )................................... T. quarta Gaud and Atyeo, 1987

4. Male: opisthosoma attenuate posteriorly, opisthosomal lobes fused by inner margins forming heavily sclerotized interlobar septa; terminal cleft narrow, less than width of opisthosomal lobe, terminal lamellae with noticeably attenuate apices or shaped as fish-tail. Female: external copulatory tube usually present, finger- or hook-shaped............................... 5

- Male: opisthosomal lobes 2-3 times longer than wide and separated by large and deep terminal cleft, terminal lamellae always rounded; adanal apodemes absent. Female: external copulatory tube short and situated on free margin of interlobar membrane or ventrally. ( stelgidopteryx group)........................................................................ 8

5. Male: terminal cleft deep, extending beyond level of setae ps2, posterior margin of prohysteronotal shield with a pair of convexities, genital apparatus flanked by a pair of paragenital apodemes connected anteriorly with epimerites IIIa ( Fig. 17D ). Female: hysteronotal shield without any ornamentation ( Fig. 21A ). ( crucifera group)............ T. crucifera Gaud, 1957

- Male: terminal cleft short, not extending beyond level of setae h2, posterior margin of prohysteronotal shield convex; paragenital apodemes absent. Female: hysteronotal shield with ornamentation of various lacunae or network pattern. ( appendiculata group)............................................................................................. 6

6. Male: terminal lamellae with concave posterior margin, shaped as fish-tail; setae h3 lacking filiform apex and not longer than 100 µm ( Fig. 16D ). Female: external copulatory tube hook-shaped and situated ventrally at level of setae h2 ( Figs. 20 C–E).................................................................................. T. piscicauda Gaud, 1957

- Male: terminal lamellae semi-ovate and strongly attenuate apically; setae h3 with filiform apex and longer than 150 µm. Female: external copulatory tube situated at free margin of interlobar membrane, finger- or hook-shaped............... 7

7. Male: rudimentary sclerites rEpIIa with acute posterior extension, shaped as teardrop; setae g nearly contagious at bases ( Fig. 16A ). Female: external copulatory tube finger- or hook-shaped with equal thickness along most its length, head of spermatheca with distinct collar ( Figs. 20A, B )............................................... T. appendiculata (Berlese, 1886)

- Male: rudimentary sclerites rEpIIa roughly semi-ovate, without acute extensions, bases of setae g distinctly separated from each other ( Figs. 1A, B , 3E ). Female: external copulatory tube ampuliform, with slightly inflated basal part and noticeably attenuate apical part, head of spermatheca without collar ( Figs. 3H, I )......................... T. ampulicaudata sp. n.

8. Male: seta d of tarsus IV situated in distal half of segment, apodemes of aedeagus situated posterior to base of intermedial sclerite and curved anterior, lobar shield completely split longitudinally ( Figs. 9D, E ). Female: setae h1 filiform; distal end of primary spermaduct with S-shaped bend at level of setae h2; external copulatory tube short finger-shaped, distinctly sclerotized, situated inside cone-shaped pocket opened at free margin of interlobar membrane ( Figs. 8A , 9I )..................................................................................................... T. cryptocaudata sp. n.

- Male: seta d of tarsus IV situated in proximal half of segment, apodemes of aedeagus situated at base of intermedial sclerite and directed postero-laterally, pieces of lobar shield connected by narrow transverse bridge. Female: setae h1 lanceolate, distal part of primary spermaduct straight, external copulatory tube short and situated on free margin of interlobar membrane..... 9

9. In both sexes, setae c2 about 10–15 long µm, setae si shorter than distance between their bases and corresponding setae se ( Figs. 10A , 11A , 12F ). Male: prohysteronotal and lobar shields connected by a pair of thin commissures, prohysteronotal shield without ornamentation................................................................. T. progne sp. n.

- In both sexes, setae c2 over 20 µm long, setae si approximately equal in length to distance between their bases and corresponding setae se. Male: prohysteronotal and lobar shields completely separated, prohysteronotal shield with distinct ornamentation................................................................................................... 10

10. Male: prohysteronotal shield with network ornamentation, length of terminal cleft 65–75 µm and greatest width 50–55 µm, adanal apodemes almost extending to level of basal sclerite ( Fig. 17A ). Female: setae h1 extending distinctly beyond tip of external copulatory tube, length of secondary spermaducts about 25–30 µm ( Figs. 20F, G ).......................................................................................... T. stelgidopteryx Mironov and Overstreet, 2016

- Male: prohysteronotal shield with circular and ovate lacuna, length of terminal cleft 110–120 µm and greatest width 65–90 µm, adanal apodemes not extending to level of basal sclerite ( Figs. 4A, B , 6E ). Female: setae h1 extending to tip of external copulatory tube, length of secondary spermaducts about 40 µm ( Figs. 5A , 6H )....................... T. bochkovi sp. n.

Figures

FIGURE 1. Trouessartia ampulicaudata sp. n., male. A—dorsal view, B—ventral view.

FIGURE 3. Trouessartia ampulicaudata 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, I—external copulatory tube of female, dorsal view. Abbreviations: ad—adanal apodeme, ae—tip of aedeagus, bs—basal sclerite, co—copulatory opening, eaepiandrum, epIVa—epimerite IVa, hs—head of spermatheca, is—intermedial sclerite, lg—latigenital sclerite, pd—primary spermaduct, pm—paramere, sd—secondary spermaduct, tl—terminal lamella.

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.

FIGURE 8. Trouessartia cryptocaudata sp. n., female. A—dorsal view, B—ventral view.

FIGURE 9. Trouessartia cryptocaudata 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, I—area with distal end of primary spermaduct, ventral view. Abbreviations: ap—apodeme of aedeagus, bs—basal sclerite, cp—copulatory pocket, ct—external copulatory tube, ea—epiandrum, is—intermedial sclerite, pd—distal end of primary spermaduct, pm—paramere.

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.

FIGURE 13. Trouessartia petrochelidon sp. n., male. A—dorsal view, B—ventral view.

FIGURE 14. Trouessartia petrochelidon sp. n., female. A—dorsal view, B—ventral view.

FIGURE 15. Trouessartia petrochelidon 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, epIVa—epimerite IVa, bs—basal sclerite, is—intermedial sclerite, pm—paramere, tl—terminal lamella.

FIGURE 16. Trouessartia species, details of males. Trouessartia appendiculata: A—ventral view of genital apparatus and opisthosoma, B—tibia and tarsus IV, C—setae si, c2, c3 and sRIII; Trouessartia piscicauda: D—ventral view of genital apparatus and opisthosoma, E—tibia and tarsus IV, F—setae si, c2, c3 and sRIII.

FIGURE 17. Trouessartia species, details of males. Trouessartia stelgidopteryx: A—ventral view of genital apparatus and opisthosoma, B—tibia and tarsus IV, C—setae si, c2, c3 and sRIII; T. crucifera: D—ventral view of genital apparatus and opisthosoma, E, F—genue I and II, G—tibia and tarsus IV, H—setae si, c2, c3 and sRIII. Abbreviations: ad—adanal apodeme, ea—epiandrum, bs—basal sclerite, is—intermedial sclerite, lg—latigenital sclerite, pg—paragenital apodeme, pm—paramere.

FIGURE 18. Trouessartia quarta, male. A—dorsal view, B—ventral view.

FIGURE 19. Trouessartia species, details of males. Trouessartia quarta: A—ventral view of genital apparatus and opisthosoma, B—tibia and tarsus IV, C—setae si, c2, c3 and sRIII; T. ripariae: D—ventral view of genital apparatus and opisthosoma, E –tibia and tarsus IV, F—setae si, c2, c3 and sRIII.

FIGURE 20. Trouessartia species, details of females. Trouessartia appendiculata: A—dorsal hysterosoma, B—spermatheca and spermaducts; T. piscicauda: C—dorsal hysterosoma, d—spermatheca and spermaducts, E—external copulatory tube, ventral view; T. stelgidopteryx: F—dorsal hysterosoma, G—spermatheca and spermaducts.

FIGURE 21. Trouessartia species, details of females. Trouessartia crucifera: A—dorsal hysterosoma, B—spermatheca and spermaducts; T. quarta: C—dorsal hysterosoma, D—spermatheca and spermaducts; T. ripariae: E—dorsal hysterosoma, Fspermatheca and spermaducts, G—area with distal end of primary spermaduct, ventral view. Abbreviations: co—copulatory opening, dp—distal bend of primary spermaduct, pd—primary spermaduct, vb—vertical bend of primary spermaduct.