taxonID	type	description	language	source
DD6E2B4DE559FF8B958A2C6DFBC480C6.taxon	materials_examined	Type species: Dermaleichus corvinus Koch, 1841, by subsequent designation.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE559FF8E958A2CFCFB4E87EE.taxon	description	(Figs 1 – 4, 13 A, B)	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE559FF8E958A2CFCFB4E87EE.taxon	materials_examined	Type material. Holotype male (ZISP 23662), 11 male and 7 female paratypes (ZISP 23663 – 23680) from Helopsaltes certhiola (Pallas, 1811) (Passeriformes: Locustellidae), SVM- 12 - 0820 - 2, Russia, Primorsky Krai, Spasski District, 5 km E of Stepnoe, 44 ° 42 ’ 27.3 ” N, 132 ° 40 ’ 06.8 ” E, 20 August 2012, coll. S. V. Mironov; 8 male and 9 female paratypes (ZISP 2368 – 23697), same host species, SVM- 19 - 0811 - 1, Russia, Primorsky Krai, Spasski District, 15 km NW of Spasskoe, Khanka Lake coast, 44 º 40 ' 04 " N, 132 º 35 ' 34 " E, 11 August 2019, coll. S. V. Mironov. Additional material. 4 males and 1 female (ZISP 23698 – 23702) from Helopsaltes ochotensis (Middendorff, 1853) (Passeriformes: Locustellidae), SVM- 11 - 0917 - 1, Russia, Sakhalin Island, 1 km S of Shebunino, 46 ° 24 ' 53 " N, 141 ° 51 ' 05 " E, 17 September 2011, coll. S. V. Mironov.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE559FF8E958A2CFCFB4E87EE.taxon	description	Description. MALE (holotype, ranges for 10 paratypes in parentheses) (Figs 1, 3 A, 4 AD, G). Idiosoma, length × width, 520 (485 – 520) × 255 (245 – 255), length of hysterosoma 350 (315 – 350). Prodorsal shield: length along midline 160 (145 – 160), greatest width 170 (150 – 170), anterior part at level of trochanters II not narrowed, anterolateral extensions pointed, almost extending to rudimentary epimerites Ia between legs I and II, lateral margins not fused with scapular shields, posterior margin almost straight, surface without ornamentation. Internal scapular setae si spiculiform, 42 (30 – 42) long, separated by 63 (59 – 63); external scapular setae se separated by 120 (105 – 120). Setae c 2 spiculiform, 70 (62 – 75) long, situated in anteromedian angles of humeral shields. Setae c 3 narrowly lanceolate with pointed apex, 25 (22 – 25) long (Fig. 4 G). Prohysteronotal and lobar parts of the hysteronotal shield completely separated by narrow transverse band of soft tegument; total length of hysteronotal shield from anterior margin to lobar apices excluding terminal lamellae 325 (300 – 325), width at anterior margin 174 (158 – 174). Length of prohysteronotal part along midline 220 (200 – 220), lateral margins at level of trochanters III with deep incisions, margin of incision with heavily sclerotized C-shaped patch, surface without ornamentation. Dorsal setae d 1, d 2, e 2 present, setae f 2 absent. Length of lobar shield 100 (100 – 105). Opisthosoma strongly attenuate posteriorly; opisthosomal lobes fused with each other along midline forming a heavily sclerotized median septum, only apical parts of lobes posterior to level of setae h 2 separated by narrow parallel-sided terminal cleft. Length of terminal cleft from anterior end to lobar apices 22 (20 – 22); length from anterior end to posterior margins of terminal lamellae 48 (41 – 48), lateral margins of cleft almost touching. Terminal lamellae semi-ovate, with one angular denticle at level of setae h 2 and with 15 – 18 rounded denticles along lateral and posterior margins, slightly overlapping by inner margins, length from bases of setae h 3 to lamellar apices 25 (22 – 25), greatest width 33 (30 – 33). Distances between dorsal setae: c 2: d 2 82 (73 – 82), d 2: e 2 120 (110 – 120), e 2: h 2 85 (80 – 85), h 2: h 3 25 (21 – 25), h 2: h 2 45 (38 – 45), h 3: h 3 33 (30 – 33), e 1: e 2 63 (55 – 63), ps 1: h 3 12 (8 – 12). Epimerites I free. Rudimentary sclerites rEpIIa small ovate. Genital apparatus: narrow, slightly enlarged posteriorly; intermedial sclerite with trapezoidal lateral projections, length excluding epiandrum 75 (70 – 75), greatest width (excluding projections) 30 (28 – 30); epiandrum ovate; distal ends of parameres, each with one denticle; aedeagus long but not extending beyond ends of parameres; basal sclerite roughly quadrangular, extending beyond level of setae g; latigenital sclerites absent (Fig. 3 A). Small paragenital apodemes flanking genital apparatus at level of lateral projections. Anterior and posterior pairs of genital papillae similar in size, anterior papillae slightly more distant from midline than posterior ones. Genital shield absent. Setae g short filiform, about 1 / 8 the distance between setae g and ps 3, with bases distant from each other. Postgenital plaque absent. Apophyses of adanal apodemes represented by two pairs of acute and flat spines at the level of adanal suckers. Lateral margins of opisthosoma without membranes. Translobar apodeme of medium width. Adanal shields represented by small ovate sclerites bearing setae ps 3. Adanal suckers 22 (20 – 22) in diameter. Anterior ends of epimerites IIIa not extending to level of setae 4 b, without angular extensions on inner margins. Epimerites IVa as plates of roughly ovate form, with anterior ends not extending to level of setae g. Setae 4 b situated anterior to level of setae 3 a, both these pairs anterior to genital apparatus apex; setae g slightly anterior to level of setae 4 a. Distances between ventral setae: 4 b: 3 a 20 (20 – 23), 4 b: 4 a 111 (106 – 111), 4 a: g 5 (5 – 6), g: ps 3 80 (75 – 80), ps 3: h 3 107 (97 – 107). Legs. Setae cG, mG of genua I, II filiform. Genual solenidia σ I and σ II situated at midlength of corresponding genua (Fig. 4 A, B). Trochanteral setae sR III narrowly lanceolate, with acute apex, 20 (16 – 20) long. Legs IV with ambulacral disc not extending to posterior margin of terminal lamellae. Tarsus IV 42 (40 – 42) long; modified setae d barrel-shaped with discoid cap, situated in distal one third of this segment; modified setae e cylindrical, without cap, situated apically (Fig. 4 D). Lengths of solenidia: σ I 48 (48 – 50), σ II 20 (15 – 20), σ III 26 (25 – 26), φ IV 48 (43 – 48). FEMALE (range for 7 paratypes) (Figs 2, 3 B – D, 4 E, F, 13 A, B). Idiosoma, length × width, 555 – 603 × 228 – 256, length of hysterosoma 390 – 420. Prodorsal shield: shape as in male, surface without ornamentation, 148 – 155 × 148 – 160. Setae si spiculiform, 25 – 30 long, separated by 60 – 62; setae se separated by 108 – 113. Setae c 2 spiculiform, 60 – 65 long, situated in anteromedial angle of humeral shields. Setae c 3 narrowly lanceolate, with pointed apex, 24 – 26 long. Hysteronotal shield: length from anterior margin to posterior tips 350 – 375, width at anterior margin 165 – 170; lateral margins at level of trochanters III shallowly concave, margin of concavity without noticeable sclerotization; surface with 3 - 4 pairs of poorly distinct lacunae arranged in a bow-shaped row between levels of trochanters III and IV, remaining area without ornamentation (Figs 2 A, 3 B, 13 B). Dorsal setae d 1, d 2, e 2 present. Setae h 1 filiform, 12 – 14 long, situated anteromesal to setae h 2, 25 – 26 from corresponding lateral margins of hysteronotal shield. Width of opisthosoma at level of setae h 2 105 – 115. Setae ps 1 situated equidistant from margins of opisthosomal lobes. Supranal concavity open posteriorly into terminal cleft, but clearly demarcated by narrow subtegumental bridge supporting primary spermaduct. Length of terminal cleft from anterior end of supranal concavity to lobar apices 155 – 165, length from free margin of interlobar membrane to lobar apices 105 – 117, greatest width of cleft 20 – 25. Interlobar membrane occupying anterior 1 / 5 – 1 / 6 of terminal cleft. External copulatory tube short and thin, situated on free margin of interlobar membrane, 11 – 12 long; basal guides of copulatory tube absent, primary spermaduct guide short. Distances between dorsal setae: c 2: d 2 77 – 92, d 2: e 2 90 – 96, e 2: h 2 75 – 85, h 2: h 3 62 – 65, h 2: h 2 78 – 90, h 3: h 3 48 – 55, d 1: d 2 33 – 41, e 1: e 2 41 – 42, h 1: h 2 20 – 21, h 1: h 1 47 – 51, ps 1: h 3 22 – 30. Epimerites I free. Epigynum 38 – 40 long, 89 – 100 wide. Inner margins of epimerites IIIa without acute extension. Epimerites IVa present. Adanal sclerites absent. Setae f 2 short setiform, setae ps 2 minute. Head of spermatheca with short smooth collar; primary spermaduct strongly expanded except the part in terminal cleft, with heavily sclerotized bend near the entrance into supranal concavity; secondary spermaducts 10 – 12 long (Fig. 3 C, D). Legs. Setae cG, mG of genua I, II filiform. Trochanteral setae sR III narrowly lanceolate, with pointed apex, 16 – 18 long. Legs IV with ambulacral disc extending to level of setae ps 1. Lengths of solenidia: σ I 49 – 51, σ II 14 – 15, σ III 22 – 26, φ III 63 – 68, φ IV 23 – 25. Barcoding data. Genbank accession numbers for COI sequences from samples from Helopsaltes certhiola (SVM- 12 - 0820 - 2 and SVM- 19 - 0811 - 1) are PV 370494 and PV 370492, respectively. The accession number for the sample from H. ochotensis is PV 370493.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE559FF8E958A2CFCFB4E87EE.taxon	etymology	Etymology. The specific epithet is taken from the host family Locustellidae and is a noun in the genitive case.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE559FF8E958A2CFCFB4E87EE.taxon	diagnosis	Differential diagnosis. The new species, Trouessartia locustellae sp. nov. is close to T. mironovi Constantinescu, 2013 from Acrocephalus melanopogon (Temminck) (Acrocephalidae) in having the following features in males: the lateral margins of lobar region are strongly convex, the margins of terminal lamellae have numerous festoonlike denticles, and the laterial incisions of hysteronotal shield are much deeper than those in females. Trouessartia locustellae differs from T. mironovi in the following characters: in both sexes, epimerites I are free, the posterior corners of the prodorsal shield are roughly rectangular, and setae c 3 are narrowly lanceolate; in males, the genital apparatus has a pair of lateral trapezoidal projections, the paragenital apodemes are free from epimerites IVa, the anterior ends of epimerites IIIa do not extend to level of setae 4 b, and the terminal lamellae are ovate in shape; in females, the external copulatory tube is 10 – 12 long. In both sexes of T. mironovi, the tips of epimerites I are connected by a narrow transverse bridge, the posterior corners of the prodorsal shield are pointed, and setae c 3 are spiculiform; in males, the genital apparatus lacks lateral trapezoidal projections, the paragenital apodemes are fused with epimerites IVa, the anterior ends of epimerites IIIa extend to the level of setae 4 b, and the terminal lamellae are circular in shape; in females, the external copulatory tube is extremely short, about 5 long.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE55CFF85958A2C3BFD9187EE.taxon	description	(Figs 5 – 8, 14 A, B)	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE55CFF85958A2C3BFD9187EE.taxon	materials_examined	Type material. Holotype male (ZISP 23703), 13 male and 15 female paratypes (ZISP 23704 – 23731) from Ficedula mugimaki (Temminck, 1815) (Passeriformes: Muscicapidae), SVM- 22 - 0531 - 1 (2), Russia, Buryatia, Kabansky District, Mishikha, 51 ° 38 ’ 36 ” N, 105 ° 31 ’ 20 ” E, 31 May 2022, coll. S. V. Mironov.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE55CFF85958A2C3BFD9187EE.taxon	description	Description. MALE (holotype, ranges for 13 paratypes in parentheses) (Figs 5, 7 A, 8 A – D, F). Idiosoma, length × width, 455 (420 – 470) × 215 (205 – 225), length of hysterosoma 305 (280 – 315). Prodorsal shield: length along midline 140 (125 – 145), greatest width 145 (140 – 155), anterior part at level of trochanters II not narrowed, anterolateral extensions elongated, with a small hook-shaped projection directed forward and not extending to epimerites Ia between legs I and II, lateral margins not fused with scapular shields, posterior margin slightly sinuous, surface with poorly distinct reticular ornamentation. Setae si spiculiform, 42 (38 – 43) long, separated by 52 (48 – 53); setae se separated by 102 (92 – 107). Setae c 2 spiculiform, 55 (55 – 68) long, situated in anteromedian angles of humeral shields. Setae c 3 narrowly lanceolate with subapical denticle, 30 (22 – 31) long (Fig. 8 F). Prohysteronotal and lobar parts of the hysteronotal shield connected, delimited by large lateral incisions encompassing bases of setae e 2, total length of hysteronotal shield from anterior margin to lobar apices excluding terminal lamellae 305 (280 – 305), width at anterior margin 155 (135 – 155). Lateral margins at level of trochanters III with small incisions, more heavily sclerotized patch at margin of these incisions without a well-defined border, surface with poorly distinct circular lacunae in median area. Dorsal setae d 1, d 2, e 2 present, setae f 2 absent. Opisthosoma attenuate posteriorly; opisthosomal lobes fused with each other along midline forming a heavily sclerotized median septum, only apical parts of lobes posterior to level of setae h 2 separated by narrow parallel-sided terminal cleft. Length of terminal cleft from anterior end to lobar apices 24 (21 – 24); length from anterior end to posterior margins of terminal lamellae 42 (40 – 47), width of cleft 3 (3 – 4). Terminal lamellae semi-ovate, with smooth margins, length from bases of setae h 3 to lamellar apices 30 (25 – 33), greatest width 31 (25 – 32). Distances between dorsal setae: c 2: d 2 72 (66 – 72), d 2: e 2 95 (85 – 97), e 2: h 2 93 (80 – 93), h 2: h 3 26 (23 – 26), h 2: h 2 35 (35 – 38), h 3: h 3 30 (26 – 30), e 1: e 2 37 (37 – 45), ps 1: h 3 10 (10 – 11). Epimerites I free. Rudimentary sclerites rEpIIa minute or indistinct. Genital apparatus: long and narrow, length excluding epiandrum 45 (38 – 45), greatest width 8 (8 – 10); epiandrum roughly ovate; distal ends of parameres without denticles; aedeagus shaped as a long, narrow cone not extending beyond apices of parameres; latigenital sclerites absent, basal sclerite almost extending to level of setae 4 a (Fig. 7 A). Anterior and posterior pairs of genital papillae similar in size, anterior papillae more distant from midline. Genital shield represented by small sclerites at bases of setae g. Setae g filiform, about 1 / 3 the distance between setae g and ps 3, with bases not adjacent to each other. Postgenital plaque small semicircular. Apophyses of adanal apodemes represented by longitudinal ridges behind the level of the adanal suckers. Lateral margins of opisthosoma without membranes. Translobar apodeme of medium width. Adanal shields represented by small ovate or teardrop-shaped sclerites bearing setae ps 3. Adanal suckers 11 (11 – 12) in diameter. Anterior ends of epimerites IIIa anterior to level of setae 4 b, without distinct angular extensions on inner margins. Epimerites IVa as plates of irregular form, with anterior ends not extending to level of setae g. Setae 4 b situated anterior to level of setae 3 a, both pairs anterior to genital apparatus apex; setae g posterior to level of setae 4 a. Distances between ventral setae: 4 b: 3 a 10 (6 – 12), 4 b: 4 a 78 (70 – 81), 4 a: g 7 (5 – 7), g: ps 3 56 (50 – 58), ps 3: h 3 106 (96 – 106). Leg. Setae cG, mG of genua I, II filiform. Genual solenidia σ I and σ II situated at midlength of corresponding genua (Fig. 8 A, B). Trochanteral setae sR III narrowly lanceolate, with subapical denticle, 22 (19 – 23) long. Legs IV with ambulacral disc extending to level of setae h 3. Tarsus IV 35 (31 – 38) long; modified setae d barrel-shaped with discoid cap, situated in distal one third of this segment; modified setae e hemispheroid, without cap, situated apically (Fig. 8 D). Lengths of solenidia: σ I 63 (48 – 63), σ II 28 (28 – 37), σ III 26 (22 – 29), φ IV 46 (45 – 56). FEMALE (range for 10 paratypes) (Figs 6, 7 B, C, 8 E, 14 A, B). Idiosoma, length × width, 520 – 560 × 220 – 240, length of hysterosoma 365 – 390. Prodorsal shield: shape as in male, surface with faint net-like ornamentation, 145 – 155 × 150 – 160. Setae si spiculiform, 42 – 48 long, separated by 50 – 55; setae se separated by 103 – 110. Setae c 2 spiculiform, 63 – 67 long, situated in anteromedial angle of humeral shields. Setae c 3 lanceolate, with subapical denticle, 28 – 33 long. Hysteronotal shield: length from anterior margin to posterior tips 330 – 355, width at anterior margin 150 – 170; lateral margins at level of trochanters III shallowly concave; sclerotization at margin of this incision barely distinct; surface in posterior 1 / 3 with clear rounded and ovate lacunae, anterior 2 / 3 with poorly distinct ornamentation of ovate lacunae (Figs 7 B, 14 B). Dorsal setae d 1, d 2, e 2 present. Setae h 1 narrowly lanceolate, 21 – 23 long, situated anteromesal to setae h 2 on non-sclerotized areas of roughly ovate form, 22 – 25 from corresponding lateral margins of hysteronotal shield. Width of opisthosoma at level of setae h 2 90 – 94. Setae ps 1 equidistant from margins of opisthosomal lobes or slightly closer to outer margins. Supranal concavity open posteriorly into terminal cleft. Length of terminal cleft from anterior end of supranal concavity to lobar apices 138 – 143, length from free margin of interlobar membrane to lobar apices 85 – 86, greatest width of cleft 28 – 35. Interlobar membrane occupying anterior 1 / 3 of terminal cleft. External copulatory tube absent, copulatory opening situated ventrally on minute nipple-like tubercle near free margin of interlobar membrane. Primary spermaduct guide present. Distances between dorsal setae: c 2: d 2 72 – 81, d 2: e 2 90 – 96, e 2: h 2 73 – 78, h 2: h 3 62 – 63, h 2: h 2 65 – 70, h 3: h 3 48 – 50, d 1: d 2 38 – 45, e 1: e 2 38 – 41, h 1: h 2 5 – 7, h 1: h 1 35 – 39, ps 1: h 3 10 – 12. Epimerites I free. Epigynum 46 – 48 long, 96 – 103 wide. Inner margins of epimerites IIIa with acute extension. Epimerites IVa present. Adanal sclerites absent. Setae f 2 indistinct, setae ps 2 short setiform. Head of spermatheca with short smooth collar; proximal end of primary spermaduct inside head of spermatheca inflated and with numerous longitudinal folds; distal part of primary spermaduct without enlargements; secondary spermaducts 45 – 50 long (Fig. 7 C). Legs I – III as in males. Trochanteral setae sR III narrowly lanceolate, with truncate apex and subapical denticle, 23 – 26 long. Legs IV with ambulacral disc not extending to level of setae ps 1. Length of solenidia: σ I 57 – 65, σ II 26 – 43, σ III 24 – 42. Barcoding data. Genbank accession number of the COI sequence is PV 370490.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE55CFF85958A2C3BFD9187EE.taxon	etymology	Etymology. The specific epithet is taken from the species name of the type host and is a noun in apposition.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE55CFF85958A2C3BFD9187EE.taxon	diagnosis	Differential diagnosis. Trouessartia mugimaki sp. nov. belongs to the grouping of species associated with Muscicapidae and most clearly characterized by setae h 1 situated on large desclerotized areas (windows) of the hysteronotal shield and by the absence of the external copulatory tube, e. g. T. swidwiensis Jablonska, 1968, T. simillima Gaud, 1957, and T. calliope Mironov, 2021 (Santana 1976; Mironov 2021 b; Dmityukov and Mironov 2023). Among species of this group, T. mugimaki is most similar to T. simillima from Muscicapa striata (Pallas) in having the following features: in males, the genital apparatus is narrow and almost parallel-sided, the prohysteronotal shield bears ornamentation of ovate lacunae, setae g are short filiform and surrounded by the semicircular subgenital plaque, and rudimentary sclerites rEpIIa are minute, barely distinct; in females, the posterior half or 1 / 3 of the hysteronotal shield bears numerous large lacunae mostly of ovate form, the non-sclerotized lacunae surrounding bases of setae h 1 are large and extend to bases of macrosetae h 2, and the copulatory opening is distant from the free margin of interlobar membrane. Trouessartia mugimaki differs from T. simillima in the following features: the tips of adanal apodemes are narrow and bent medially with a distinct blunt angle; the apophyses of adanal apodemes are shaped as longitudinal ridges; genital setae g are situated posterior to the level of setae 4 a; in females, the terminal cleft is narrow (28 – 35 wide), setae h 1 are 21 – 24 long and distinctly longer than half the distance between their bases, and the opisthosoma is narrower, with the width at the level of setae h 2 90 – 94 (Figs 6 A, 7 B, 14 A). In males of T. simillima, the anterior ends of adanal apodemes are thick and slightly curved, the apophyses of adanal apodemes are shaped as tubercles, genital setae g are situated at the level of setae 4 a; in females, the width of terminal cleft is 40 – 50, setae h 1 are 18 – 20 long and barely extend to the midline of idiosoma, and the width of opisthosoma at the level of setae h 2 is 100 – 110 (Fig. 13 D).	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE557FF9A958A2C3BFAD980A2.taxon	description	(Figs 9 – 12, 14 C, D)	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE557FF9A958A2C3BFAD980A2.taxon	materials_examined	Type material. Holotype male (ZISP 23732), 8 male and 7 female paratypes (ZISP 23733 – 23747) from Pyrrhula pyrrhula Linnaeus, 1758 (Passeriformes: Fringillidae), SVM- 12 - 0823 - 4 (3), Russia, Primorsky Krai, Krasnoarmeiski District, Iman river, 25 km S of Melnichnoye, 44 ° 59 ’ 43.7 ” N, 134 ° 04 ’ 13.7 ” E, 23 August 2012, coll. S. V. Mironov.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE557FF9A958A2C3BFAD980A2.taxon	description	Description. MALE (holotype, ranges for 8 paratypes in parentheses) (Figs 9, 11 A, 12 A – D, F). Idiosoma, length × width, 590 (585 – 610) × 320 (315 – 325), length of hysterosoma 400 (400 – 420). Prodorsal shield: length along midline 165 (165 – 175), greatest width posterior to scapular setae 200 (195 – 210), anterior part at level of trochanters II not narrowed, anterolateral extensions angular with widely rounded ends, not extending to rudimentary epimerites Ia between legs I and II, lateral margins not fused with scapular shields, posterior margin straight, surface without ornamentation. Internal scapular setae si narrowly lanceolate, 50 (50 – 62) long, separated by 61 (61 – 66); external scapular setae se separated by 120 (120 – 130). Setae c 2 thick spiculiform, 90 (87 – 90) long, situated in anteromedian angles of humeral shields. Setae c 3 lanceolate with pointed apex, 27 (27 – 28) long (Fig. 12 F). Prohysteronotal and lobar parts of the hysteronotal shield connected, delimited from each other by lateral incisions extending to bases of setae e 2, total length of hysteronotal shield from anterior margin to lobar apices excluding terminal lamellae 380 (375 – 395), width at anterior margin 210 (210 – 220). Lateral margins at level of trochanters III straight and heavily sclerotized, but these dark areas do not form separate patches and fused with large sclerotized bands along lateral borders of prohysteronotal shield, surface without ornamentation. Dorsal setae d 1, d 2, e 2 present, setae f 2 absent. Opisthosoma strongly attenuate posteriorly; opisthosomal lobes fused with each other along midline forming a heavily sclerotized median septum, apical parts of lobes posterior to level of setae h 2 separated by narrow parallel-sided terminal cleft. Length of terminal cleft from anterior end to lobar apices 41 (35 – 41); length from anterior end to posterior margins of terminal lamellae 70 (70 – 73), width of cleft 5 (5 – 7). Terminal lamellae semi-ovate, with smooth margin, length from bases of setae h 3 to lamellar apices 30 (30 – 38), greatest width 35 (35 – 37). Distances between dorsal setae: c 2: d 2 90 (90 – 93), d 2: e 2 123 (121 – 132), e 2: h 2 106 (106 – 113), h 2: h 3 38 (35 – 38), h 2: h 2 53 (53 – 57), h 3: h 3 41 (41 – 48), e 1: e 2 60 (55 – 60), ps 1: h 3 12 (9 – 12). Epimerites I free. Rudimentary sclerites rEpIIa small ovate. Genital apparatus: long and narrow, strongly convex dorsally, length excluding epiandrum 64 (64 – 68), greatest width 15 (14 – 15); epiandrum ovate; distal ends of parameres without denticles; aedeagus shaped as narrow cone approximately half as long as parameres; latigenital sclerites absent, basal sclerite barely extending to level of setae g (Fig. 11 A). Anterior and posterior pairs of genital papillae similar in size, anterior papillae more distant from midline. Genital shield represented by small irregular sclerites at bases of setae g. Setae g filiform, about 1 / 3 or more the distance between setae g and ps 3, with bases not adjacent to each other. Postgenital plaque small trapezoidal. Apophyses of adanal apodemes represented by small tubercles situated behind level of adanal suckers. Lateral margins of opisthosoma at level of adanal sucker strongly convex. Translobar apodeme wide. Adanal shields represented by small ovate sclerites bearing setae ps 3. Adanal suckers 14 (13 – 14) in diameter. Anterior ends of epimerites IIIa extending to level of setae 4 b, their inner margins with blunt-angular extension or without it. Epimerites IVa shaped as roughly ovate plates, with anterior ends not extending to level of setae g. Setae 4 b situated anterior to level of setae 3 a, both pairs anterior to genital apparatus apex; setae g and 4 a approximately at same transverse level. Distances between ventral setae: 4 b: 3 a 12 (6 – 12), 4 b: 4 a 102 (97 – 102), 4 a: g 2 (2 – 6), g: ps 3 83 (82 – 93), ps 3: h 3 140 (135 – 140). Legs. Setae cG, mG of genua I, II filiform. Genual solenidia σ I and σ II situated at midlength of corresponding genua (Fig. 12 A, B). Trochanteral setae sR III narrowly lanceolate, with pointed apex, 23 (22 – 23) long. Legs IV with ambulacral disc extending to level of setae h 3. Tarsus IV 50 (49 – 50) long; modified setae d barrel-shaped with discoid cap, situated in distal one third of this segment; modified setae e cylindrical, without cap, situated apically (Fig. 12 D). Lengths of solenidia: σ I 76 (63 – 76), σ II 25 (20 – 25), σ III 45 (44 – 49), φ IV 63 (60 – 64). FEMALE (range for 7 paratypes) (Figs 10, 11 B, C, 12 E, 14 C, D). Idiosoma, length × width, 663 – 705 × 325 – 346, length of hysterosoma 472 – 490. Prodorsal shield: shape as in male, surface with faint reticulate ornamentation, 170 – 190 × 210 – 220. Setae si spiculiform, 52 – 63 long, separated by 68 – 77; setae se separated by 132 – 139. Setae c 2 narrowly lanceolate, with pointed apex, 83 – 91 long, situated in anteromedial angle of humeral shields. Setae c 3 lanceolate, with pointed apex, 29 – 32 long. Hysteronotal shield: length from anterior margin to posterior tips 415 – 445, width at anterior margin 230 – 250; lateral margins at level of trochanters III almost straight, longitudinal sclerotized patch at these margins only slightly darker than large sclerotized bands going along entire border of this shield; surface of posterior half from level of setae d 2 with numerous large circular and ovate lacunae, lacunae along midline noticeably smaller (Figs 10 A, 11 B). Dorsal setae d 1, d 2, e 2 present. Setae h 1 narrowly lanceolate, 40 – 44 long, situated anteromesal to setae h 2, 23 – 25 from corresponding lateral margins of hysteronotal shield. Width of opisthosoma at level of setae h 2 140 – 150. Setae ps 1 equidistant from margins of opisthosomal lobes. Supranal concavity open posteriorly into terminal cleft. Length of terminal cleft from anterior end of supranal concavity to lobar apices 150 – 170, length from free margin of interlobar membrane to lobar apices 94 – 98, greatest width of cleft 65 – 70. Interlobar membrane occupying about 1 / 2 of terminal cleft. External copulatory tube long stylet-like, situated on free margin of interlobar membrane, 42 – 45 long; basal guides of copulatory tube longer than tube and fused into gutter-like sclerite covering primary spermaduct dorsally; primary spermaduct guide short. Distances between dorsal setae: c 2: d 2 99 – 107, d 2: e 2 126 – 135, e 2: h 2 80 – 87, h 2: h 3 59 – 63, h 2: h 2 109 – 117, h 3: h 3 91 – 100, d 1: d 2 50 – 58, e 1: e 2 69 – 73, h 1: h 2 12 – 15, h 1: h 1 66 – 72, ps 1: h 3 17 – 18. Epimerites I free. Epigynum 47 – 53 long, 110 – 122 wide. Inner margins of epimerites IIIa with short pointed or bluntly angular extension. Epimerites IVa present. Adanal sclerites small ovate. Setae f 2 and ps 2 present. Head of spermatheca with collar bearing 6 - 8 long acute denticles; primary spermaduct slightly enlarged near head of spermatheca; secondary spermaducts 30 – 35 long (Fig. 11 C). Legs. Setae cG, mG of genua I, II filiform. Trochanteral setae sR III narrowly lanceolate, with pointed apex, 23 – 26 long. Legs IV with ambulacral disc extending to level of setae ps 1. Length of solenidia: σ I 62 – 69, σ II 23 – 25, σ III 32 – 50. Barcoding data. The Genbank accession number of the COI sequence is PV 370491.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE557FF9A958A2C3BFAD980A2.taxon	etymology	Etymology. The specific epithet is taken from the species name of the type host and is a noun in apposition.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE557FF9A958A2C3BFAD980A2.taxon	diagnosis	Differential diagnosis. Trouessartia pyrrhulae sp. nov. is most close to T. jedliczkai (Zimmermann, 1894) and T. motacillae Dubinin, 1952 inhabiting M. flava Linnaeus and Motacilla alba Linnaeus (Motacillidae), respectively. These species share the following features in females: the external copulatory tube is long stylet-like, and the collar of spermatheca has a comb of acute denticles. Trouessartia pyrrhulae differs from both aforementioned species in having the following features: in both sexes, sclerotized patches at the lateral margins of hysteronotal shield are narrow and poorly distinct, setae c 2 are similar in length to the humeral shields; in males, the prohysteronotal and lobar parts of the hysteronotal shield are connected and demarcated from each other by lateral incisions at level of setae e 2, the length of setae g is about 1 / 3 the distance between setae g and ps 3; in females, the tip of the external copulatory tube extends beyond the level of setae h 3, and all lacunae in the posterior half of hysteronotal shield are uniformly outlined. In both sexes of T. jedliczkai and T. motacillae, the lateral margins of the hysteronotal shield have a pair of distinct bean-shaped sclerotized patches at the level of trochanters III, setae c 2 are half as long as the humeral shields; in males, the prohysteronotal and lobar parts of the hysteronotal shield are completely separated (in T. motacillae) or are connected by a narrow median bridge (T. jedliczkai), the length of setae g is about 1 / 2 the distance between setae g and ps 3; in females, the tip of external copulatory tube does not extend to the level of setae h 3, and small lacunae arranged along the midline are outlined much more clearly than the remaining larger lacunae on the posterior part of the hysteronotal shield.	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
DD6E2B4DE557FF9A958A2C3BFAD980A2.taxon	discussion	Remark. It can look strange that Trouessartia pyrrhulae, described above from the Eurasian bullfinch Pyrrhula pyrrhula in the Russian Far East, was not detected on this host in Europe, where this bird is common although not abundant, and feather mite investigations have been conducted for over 150 years. This can be explained by the following hypothesis. The Eurasian bullfinch is the only species of eight species of the genus Pyrrhula Brisson having a giant geographical range across the entire Eurasia, from the Western Europe to Kamchatka peninsula (Gill et al. 2024). All remaining species of the genus Pyrrhula, except P. murina Godman, are distributed in the oriental part of Asia: from Himalayan considered the center of origin and dispersion of this genus to South-East Asia. Undescribed Trouessartia species were reported from bullfinches in South-East Asia, in particular from P. nipalensis Hodgson (Atyeo 1973). It is reasonable to conclude that P. pyrrhula has lost T. pyrrhulae during dispersion from Asia to the Western Europe and retained this mite species only in the ancestral part of range. On the Azores Bullfinch P. murina, which is the closest to P. pyrrhula, any Trouessartia species was also not detected, although this Azorean endemic bears two other feather mites, Analges macropus Zimmermann, 1894 (Analgidae) and Mesalgoides pyrrhulinus Mironov, 1997 (Psoroptoididae), which are common for the Eurasian bullfinch (Rodrigues et al. 2015).	en	Mironov, Sergey V., Dmitryukov, Arsenii V. (2025): Three new species of the feather mite genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Passeriformes) in the Asian part of Russia. Zootaxa 5661 (2): 178-200, DOI: 10.11646/zootaxa.5661.2.2, URL: https://doi.org/10.11646/zootaxa.5661.2.2
