taxonID	type	description	language	source
03A05400FF9F98486CC17C25078BFA94.taxon	type_taxon	Type species: Dermaleichus corvinus Koch, 1841, by subsequent designation (Oudemans 1897).	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9F98486CC17C25078BFA94.taxon	discussion	With 160 species as of 2025, and including the two new species described herein, Trouessartia is the second largest genus of feather mites, only behind Proctophyllodes Robin, 1868 (Analgoidea: Proctophyllodidae, 182 species) (Mironov 2021 a, 2021 b, 2022, 2023; Gaud & Atyeo 1986, 1987; Mironov & Galloway 2019; Mironov & Chandler 2020; Mironov & Zabashta 2022; Mironov et al. 2021; Constantinescu et al. 2016 a, 2016 b, 2018, 2023 a, b, 2024; Mironov & González-Acuña 2013; Hernandes 2014, 2017, 2022, 2023; Hernandes & OConnor 2017; Hernandes & Valim 2015; Hernandes et al. 2022; Dmitryukov & Mironov 2023; Mironov & Dmitryukov 2025). The most important monograph on this genus is the work of Santana (1976), who provided redescriptions and references of nearly all the 70 species known by that time. Mironov (2022) provided uniform diagnoses for 11 species groups of Trouessartia, including a world checklist of species of this genus and their respective type hosts, and Hernandes (2022) provided a checklist of Trouessartia species from Brazil, including host species with undetermined Trouessartia species. Trouessartia are generally medium to large sized acariform mites (~ 400 - 600 micrometers in length), and are mostly found on the dorsal surface of large wing and tail feathers (remiges and rectrices). They have a dorsoventrally flattened body, and the dorsum extensively covered with well sclerotized shields. Species of this genus occur mainly on passerines (Passeriformes), and the few reliable records of species on non-passerines are all from the bird order Piciformes: one species from African barbets (Lybiidae) (Gaud 1993), and two species from Neotropical woodpeckers (Picidae) (Hernandes 2014, Mironov & Bermúdez 2017). Although other bird groups have previously been reported as hosts of Trouessartia (e. g. Alcedinidae, Anhingidae, Apodidae, Caprimulgidae, Charadriidae, Heliornithidae, Psittacidae) (Santana 1976; Enout et al. 2012), these are mainly one-time records and probably accidental contaminations, and do not constitute valid associations.	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9F98426CC17BA2018DFC7C.taxon	description	(Figs 1 – 5)	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9F98426CC17BA2018DFC7C.taxon	materials_examined	Type material. Holotype male, paratypes 7 males, 8 females ex Elaenia ridleyana Sharpe, 1888 (Passeriformes: Tyrannidae), BRAZIL, Sancho Beach, - 3.855044, - 32.441128, Fernando de Noronha, 17. VIII. 2023, # F 79770, coll. L. Amaral; other paratypes: 1 male, 4 females, same data, # F 79771; 2 males, 1 female, same data, # F 79772, coll. C. Licarião; 8 males, 9 females, same data, # F 61452, 02 October 2024, coll. L. Amaral.	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9F98426CC17BA2018DFC7C.taxon	description	Description. MALE (holotype, range for 5 paratypes in parentheses) (Figures 1, 3 A – D, 4 A, 5 A, C, D). Length of idiosoma from anterior end to bases of setae h 3 429 (445 – 471), greatest width of idiosoma at level of setae d 1 189 (182 – 193). Length of hysterosoma from sejugal furrow to bases of setae h 3 268 (263 – 284). Prodorsal shield: length along midline 121 (133 – 144), greatest width posterior to scapular setae 146 (145 – 158), lateral margins with concavity at level of scapular setae, posterior part not fused with scapular shields, anterolateral extensions acute, not extending to bases of epimerites Ia between legs I and II, posterior angles acute, surface with faint reticulate pattern (Figure 1 A). Vertical setae ve represented by alveoli. Internal scapular setae si thin setiform, 22 (23 – 27) long, separated by 63 (56 – 63); external scapular setae se 158 (145 – 161) long, separated by 99 (93 – 105). Humeral shield with setae c 2 thin, setiform, 27 (37 – 47) long. Setae c 3 lanceolate, without subapical tooth, 22 (20 – 25) long. Prohysteronotal and lobar shields not split from each other, yet delimited by transverse bow-shaped fold. Prohysteronotal shield: length 188 (174 – 209), greatest width at level of humeral shields 143 (146 – 160), lateral margins sinuous, with shallow concavities at level of setae d 2 and e 1, dorsal hysterosomal apertures (DHA) absent, with a pair of dark crescent or bean shaped patches near lateral margins at level of trochanters III, surface with faint ovate lacunae, posterolateral margins with U-shaped darker area from levels of setae d 2 to e 2. Dorsal setae d 1, d 2 present, minute. Setae h 1 inserted dorsally between setae ps 2 and h 2. Length of lobar shield excluding lamellae 95 (90 – 97). Opisthosoma attenuate posteriorly; opisthosomal lobes fused to each other along midline forming a sclerotized median septum, with only apical parts of lobes posterior to setae h 2 separated by narrow parallel-sided terminal cleft, length of cleft from anterior end to apices of lamellae 49 (50 – 54), width around level of setae ps 1 7 (5 – 7). Lamellae roughly kidney-shaped, margins smooth, length from bases of setae h 3 to lamellar apices 26 (25 – 29), width of each lamella at level of setae h 3 36 (35 – 42). Setae h 2 274 (221 – 263) long, setae h 3 155 (127 – 188) long. Distance between levels of dorsal setae and setal pairs: c 2: d 2 79 (73 – 83), d 1: d 2 27 (37 – 46), e 1: e 2 43 (37 – 45), e 2: h 2 77 (73 – 81), h 2: h 3 25 (21 – 25), h 2: h 2 45 (41 – 47), h 3: h 3 37 (31 – 37). Epimerites I free. Rudimentary sclerites rEpIIa present, small, irregularly shaped. Humeral shield ventrally fused with epimerites III. Genital apparatus situated between levels of trochanters III and IV, length 39 (40 – 44), greatest width 18 (16 – 23) (Figure 1 B, 5 E), aedeagus short, anterior tip tapering. Epiandrum present, roughly keyhole-shaped, situated at level of trochanters III. Postgenital plaque and genital shield both absent; setae g thin, piliform, with bases almost touching each other. Epimerites IVa present, their anterior level reaching the level of setae g and 4 a. Apophyses of adanal apodemes as small spines. Translobar apodeme present. Setae ps 3 inserted on round and small adanal shields at posterior level of anal opening. Adanal suckers 18 (17 – 19) in diameter, distance between centers of discs 26 (23 – 33). Setae 4 b situated slightly anterior to level of setae 3 a, setae g and 4 a roughly at the same transverse level. Distance between ventral setae: 4 b: 3 a 8 (5 – 14), 4 b: g 80 (80 – 84), g: ps 3 59 (56 – 68), ps 3: ps 3 42 (41 – 45). Legs IV with ambulacral disc extending to or slightly beyond level of setae h 3. Setae sR of trochanters III lanceolate, with acute apex, 16 (16 – 18) long. Modified setae d of tarsus IV barrel-shaped, with discoid cap, situated in proximal half of the segment approximately at level of seta r; modified setae e hemispheroid, without cap, situated apically; alveolus of seta r distinctly sclerotized (Figure 3 D). Length of solenidia: σ of genu I 41 (41 – 48), σ of genu II 12 (12 – 15), σ of genu III 26 (25 – 28), φ of tibia I 72 (75 – 78), φ of tibia II 80 (77 – 83), φ of tibia III 61 (59 – 69), φ of tibia IV 39 (37 – 40), ω 1 of tarsus I 22 (23 – 25), ω 3 of tarsus I 31 (34 – 35), ω 1 of tarsus II 25 (24 – 25). FEMALE (range for 5 paratypes) (Figures 2, 3 E, 4 B – C, 5 B, F, G). Length of idiosoma from anterior end of prodorsal shield to sclerotized tips of lobes, excluding lamellar lobar processes 494 – 520, greatest width 195 – 207. Length of hysterosoma from sejugal furrow to apices of lamellar lobar processes 348 – 289. Prodorsal shield: shape and surface as in male, 145 – 152 in length, greatest width 166 – 167 (Figure 2 A). Vertical setae ve represented by alveoli. Setae si thin setiform, 24 – 33 long, separated by 67 – 70; setae se 161 – 177 long, separated by 112 – 115. Humeral shields with setae c 2 thin setiform, 42 – 53 long. Setae c 3 narrowly lanceolate, without subapical tooth, 21 – 26 in length. Hysteronotal shield: length from anterior margin to bases of setae h 3 303 – 333, width at largest part at level of setae d 1 149 – 163, lateral margins sinuous, with irregular concavities at level of trochanters III, sclerotized patch near lateral margin, DHA absent, surface of anterior half with faint reticulation and irregular faint lacunae. Dorsal setae d 1, d 2 present, minute. Setae h 1 thin piliform, 13 – 17 long, situated antero-mesal to bases of setae h 2. Distance between bases of h 1 and lateral margins of hysterosoma 12 – 17. Width of opisthosoma at level of setae h 2 107 – 116. Setae ps 1 positioned dorsally on opisthosomal lobes, near bases of setae h 3, equidistant from outer and inner margins of lobe. Distance from bases of setae h 3 to membranous apices of lobes 48 – 54. Setae f 2 present, minute, posterolateral to ps 2. Setae h 2 267 – 309 long, setae h 3 186 – 237. Supranal concavity open posteriorly into terminal cleft. Length of terminal cleft including supranal concavity 156 – 163, width of cleft at level of setae h 3 33 – 42. Interlobar membrane narrow. External copulatory tube short, with blunt tip, situated on free margin of interlobar membrane, 19 – 24 long. Primary spermaduct guide absent; guides of the external copulatory tube absent. Spermatheca as in Figure 4 C, secondary spermaducts about 25 long. Distance between levels of dorsal setae and setal pairs: c 2: d 2 79 – 91, d 1: d 2 45 – 47, d 2: e 2 95 – 104, e 1: e 2 46 – 53, e 2: h 2 66 – 71, h 1: h 1 56 – 65, h 1: h 2 21 – 25, h 2: h 2 88 – 99, h 3: h 3 65 – 71. Epimerites I free. Epigynum 47 – 50 in length, 80 – 102 in width (Figure 2 B). Epimerites IVa present. Adanal shields present. Setae ps 3 situated at posterior level of anal opening. Setae sR of trochanters III lanceolate, with acute apex, 15 – 19 long. Legs IV with ambulacral disc extending to level of setae ps 1. Length of solenidia: σ of genu I 45 – 49, σ of genu II 13 – 18, σ of genu III 20 – 30, φ of tibia I 67 – 78, φ of tibia II 79 – 88, φ of tibia III 46 – 66, φ of tibia IV 32 – 46, ω 1 of tarsus I 23 – 24, ω 3 of tarsus I 34 – 38, ω 1 of tarsus II 25 – 28.	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9F98426CC17BA2018DFC7C.taxon	diagnosis	Differential diagnosis. The new species, Trouessartia noronhaensis sp. nov., is close to T. elaeniae Mironov & González-Acuña, 2013 described from Elaenia albiceps (D'Orbigny & Lafresnaye, 1837) (Passeriformes: Tyrannidae). This species was not assigned to any of the 11 currently recognized species groups (Mironov 2022). Both sexes of these species have a reticulate pattern of ornamentation on both the prodorsal and hysteronotal shields; in males, setae g are piliform, the postgenital plaque is absent, and the terminal lamellae are rounded and smooth; and in females, setae h 1 are short and piliform. Males of Trouessartia noronhaensis sp. nov. differ from the latter in having the adanal shields small and round (bearing setae ps 3), relatively shorter setae g (not reaching the anterior level of anal opening), and setae d and r on tarsus IV situated approximately at the same transverse level; in females, the external copulatory tube is present, finger-like and about 19 – 24 long. In males of T. elaeniae, the adanal shields are shaped as inverted commas, with acute extension directed anteriorly, setae g are much longer and with about half its length surpassing the anterior level of anal opening, and seta d is distinctly posterior to seta r on tarsus IV. In females of T. elaeniae, the external copulatory tube is extremely short, about 5 long, and truncate.	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9F98426CC17BA2018DFC7C.taxon	etymology	Etymology. The specific name refers to the type locality for this species, the Island of Fernando de Noronha.	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9598446CC17DD10509F9AC.taxon	description	(Figs. 6 – 10)	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9598446CC17DD10509F9AC.taxon	materials_examined	Type material. Holotype male, paratypes 8 males, 6 females ex Vireo gracilirostris Sharpe, 1890 (Passeriformes: Vireonidae), BRAZIL, Pernambuco, Fernando de Noronha, Sancho Beach, - 3.855044, - 32.441128, 17 August 2023, coll. G. Sobral, # D 168342; other paratypes: 2 males, 4 females, same data, # D 168330, coll. C. Licarião; 6 males, 2 females, same data, # D 168331, coll. C. Licarião; 1 male, same data, # D 168329, coll. G. Sobral; 1 male, 1 female, same data, # D 168340, coll. C. Licarião.	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9598446CC17DD10509F9AC.taxon	description	Description. MALE (holotype, range for 6 paratypes in parentheses) (Figures 6, 8 A – D, 9 A, 10 A, C – E). Length of idiosoma from anterior end to bases of setae h 3 481 (464 – 496), greatest width of idiosoma at level of setae d 1 212 (209 – 224). Length of hysterosoma from sejugal furrow to bases of setae h 3 301 (286 – 300). Prodorsal shield: length along midline 137 (132 – 142), greatest width posterior to scapular setae 148 (139 – 155), lateral margins with two concavities at level of scapular setae, posterior part not fused with scapular shields, anterolateral extensions acute, not extending to bases of epimerites Ia between legs I and II, posterior angles acute, surface with faint reticulate pattern (Figures 6 A, 10 C). Vertical setae ve represented by alveoli. Internal scapular setae si thin setiform, 27 (25 – 34) long, separated by 55 (54 – 64); external scapular setae se 153 (133 – 165) long, separated by 95 (91 – 102). Humeral shield with setae c 2 thin, setiform, 63 (51 – 59) long. Setae c 3 lanceolate, without subapical tooth, 23 (14 – 23) long. Prohysteronotal and lobar shields completely split from each other. Prohysteronotal shield: length 188 (180 – 196), greatest width at level of humeral shields 154 (142 – 159), lateral margins roughly sinuous, with a few indentations and protrusions at level of trochanters III, dorsal hysterosomal apertures (DHA) and sclerotized parches absent, surface with faint reticulate pattern, posterolateral margins with U-shaped darker area from levels of setae d 2 to e 2. Dorsal setae d 1, d 2 present, minute. Setae h 1 inserted dorsally between setae ps 2 and h 2. Length of lobar shield excluding lamellae 94 (93 – 99). Opisthosoma attenuate posteriorly; opisthosomal lobes fused to each other along midline forming a sclerotized median septum, with only apical parts of lobes posterior to setae h 2 separated by narrow parallel-sided terminal cleft, length of cleft from anterior end to apices of lamellae 49 (42 – 58), width around level of setae ps 1 10 (6 – 10). Lamellae semicircular, margins smooth, length from bases of setae h 3 to lamellar apices 33 (23 – 30), width of each lamella at level of setae h 3 33 (31 – 35). Setae h 2 284 (257 – 298) long, setae h 3 140 (126 – 175) long. Distance between levels of dorsal setae and setal pairs: c 2: d 2 70 (66 – 73), d 1: d 2 48 (37 – 56), e 1: e 2 46 (37 – 48), e 2: h 2 81 (77 – 86), h 2: h 3 24 (24 – 26), h 2: h 2 44 (42 – 48), h 3: h 3 36 (33 – 41). Epimerites I free. Rudimentary sclerites rEpIIa present, small, shaped roughly as an inverted teardrop, with a small lacuna inside. Humeral shield ventrally fused with epimerites III. Genital apparatus situated between levels of trochanters III and IV, length 50 (48 – 53), greatest width 28 (23 – 28) (Figures 6 B, 10 D – E), aedeagus short, distal end thin, hook-like. Epiandrum present, small, roughly oval-shaped, situated at anterior end of genital apparatus. Postgenital plaque present, semicircular; genital shield absent; setae g thin, piliform, with bases not enlarged and not touching each other. Epimerites IVa present, their anterior ends not reaching the level of setae g. Apophyses of adanal apodemes shaped as small triangular extensions situated slightly anterior to the translobar apodeme. Translobar apodeme present. Setae ps 3 on small triangular adanal shields situated anterior to adanal suckers. Adanal suckers 18 (16 – 20) in diameter, distance between centers of discs 27 (26 – 30). Setae 4 b situated anterior to level of setae 3 a, setae g slightly posterior to level of 4 a. Distance between ventral setae: 4 b: 3 a 12 (10 – 14), 4 b: g 85 (72 – 100), g: ps 3 46 (45 – 49), ps 3: ps 3 38 (34 – 41). Legs IV with ambulacral disc extending to level of setae h 3. Setae sR of trochanters III lanceolate, with acute apex, 17 (15 – 17) long. Modified setae d of tarsus IV barrel-shaped, with discoid cap, situated in distal half of the segment; modified setae e hemispheroid, without cap, situated apically, setae d and e inserted almost contiguously near tarsal apex (Figure 8 D). Length of solenidia: σ of genu I 44 (45 – 55), σ of genu II 14 (10 – 15), σ of genu III 32 (27 – 32), φ of tibia I 74 (62 – 74), φ of tibia II 82 (75 – 82), φ of tibia III 63 (58 – 66), φ of tibia IV 40 (40 – 47), ω 1 of tarsus I 22 (20 – 23), ω 3 of tarsus I 28 (31 – 35), ω 1 of tarsus II 24 (23 – 28). FEMALE (range for 5 paratypes) (Figures 7, 8 E, 9 B – C, 10 B, F, G). Length of idiosoma from anterior end of prodorsal shield to sclerotized tips of lobes, excluding lamellar lobar processes 486 – 517, greatest width 214 – 233. Length of hysterosoma from sejugal furrow to apices of lamellar lobar processes 347 – 376. Prodorsal shield: shape and surface as in male, 136 – 153 in length, greatest width 146 – 169 (Figure 7 A). Vertical setae ve represented by alveoli. Setae si thin setiform, 24 – 39 long, separated by 56 – 68; setae se 147 – 177 long, separated by 100 – 110. Humeral shields with setae c 2 thin setiform, 53 – 56 long. Setae c 3 narrowly lanceolate, without subapical tooth, 17 – 24 in length. Hysteronotal shield: length from anterior margin to bases of setae h 3 293 – 316, width at largest part at the level of setae d 1 148 – 173, lateral margins sinuous, with two irregular concavities at level of trochanters III, DHA and sclerotized patches absent, surface with faint reticulation on anterior half, and slit-like longitudinal lacunae between levels of setae e 1 and supranal concavity, borders darker than remaining surface. Dorsal setae d 1, d 2 present, minute. Setae h 1 thin spiculiform, 23 – 29 long, situated anteromesal to bases of setae h 2. Distance between bases of h 1 and lateral margins of hysterosoma 21 – 24. Width of opisthosoma at level of setae h 2 104 – 117. Setae ps 1 positioned dorsally on opisthosomal lobes, much closer to bases of h 3 than to h 2, equidistant from outer and inner margins of lobe. Distance from bases of setae h 3 to membranous apices of lobes 55 – 60. Setae f 2 present, minute, placed posterolateral to ps 2. Setae h 2 245 – 270 long, setae h 3 215 – 259. Supranal concavity open posteriorly into terminal cleft. Length of terminal cleft including supranal concavity 153 – 168, width of cleft at level of setae h 3 39 – 45. Interlobar membrane narrow. External copulatory tube short finger-shaped, situated on the free margin of interlobar membrane, 11 – 13 long. Primary spermaduct guide very short, half as long as supranal concavity, not reaching the level of setae h 1. Spermatheca as in Figure 9 C, secondary spermaducts 17 – 28 long. Distance between levels of dorsal setae and setal pairs: c 2: d 2 74 – 85, d 1: d 2 41 – 49, d 2: e 2 92 – 100, e 1: e 2 32 – 40, e 2: h 2 67 – 75, h 1: h 1 47 – 55, h 1: h 2 15 – 20, h 2: h 2 83 – 94, h 3: h 3 61 – 69. Epimerites I free. Epigynum 47 – 55 in length, 101 – 117 in width (Figure 9 B). Epimerites IVa present. Adanal sclerites absent. Setae ps 3 situated at posterior level of anal opening. Setae sR of trochanters III lanceolate, with acute apex, 12 – 18 long. Legs IV with ambulacral disc extending to level of setae ps 1. Length of solenidia: σ of genu I 47 – 61, σ of genu II 12 – 14, σ of genu III 28 – 32, φ of tibia I 66 – 73, φ of tibia II 70 – 82, φ of tibia III 55 – 63, φ of tibia IV 26 – 32, ω 1 of tarsus I 20 – 23, ω 3 of tarsus I 29 – 35, ω 1 of tarsus II 24 – 28.	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9598446CC17DD10509F9AC.taxon	diagnosis	Differential diagnosis. The new species, Trouessartia insularis sp. nov., does not fit to any of the 11 species groups (Mironov 2022). Most of all, the new species resembles T. savanae Hernandes, 2014 in having setae si and c 2 very thin (= piliform), setae c 3 and sRIII lanceolate with acute apex, and the lateral margins of hysteronotal shield without any distinct dark patch at the level of trochanters III. In females of both species, setae h 1 are thin lanceolate, the copulatory tube is short; and in males setae g are short filiform, and seta d of tarsus IV are positioned distally in the segment, close to seta e. The new species, T. insularis sp. nov., can be separated from T. savanae based on the following features: in males, the epiandrum is relatively smaller, roundish and placed near the parameres of the genital apparatus (vs. larger, square-shaped and distinctly anterior from the parameres in T. savanae); the postgenital plaque is present (vs. absent); genital setae g are distinctly separated from each other (vs. touching at bases), and the posterior part of the basal sclerite of genital apparatus is strongly sclerotized (vs. unsclerotized). In females of T. insularis sp. nov., the opisthosomal lacunae between the levels of setae e 1 and e 2 are narrow slit-like (vs. oval to rounded in T. savanae), the reticulate pattern of ornamentation is present on the prodorsal shield and in the anterior half of the hysteronotal shield (vs. reticulate ornamentation absent).	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9598446CC17DD10509F9AC.taxon	discussion	Remarks. This is the first description of Trouessartia species from a host of the Vireonidae (see Hernandes 2022; Mironov 2022). Silva et al. (2015) reported an undetermined species from another vireonid, Hylophilus amaurocephalus (Nordmann, 1835).	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9598446CC17DD10509F9AC.taxon	etymology	Etymology. The specific name points out that the type locality of this species is an island (Fernando de Noronha).	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9398456CC17931017BFE74.taxon	materials_examined	Type species: Tyrannidectes berlai Mironov, 2008 (in Mironov et al. 2008), by original designation. To date, 13 species have been assigned to this genus, all occurring in Passeriformes of the New World. Ten species are associated with passerines of the family Tyrannidae, and one species occurs on some representatives from each of passerine families Parulidae, Furnariidae, and Vireonidae. The currently recognized species of this genus are as follows: T. anairetes Mironov & González-Acuña 2011, T. banksi (Valim & Hernandes 2008), T. berlai Mironov 2008, T. caribaeus (Mironov and González-Acuña 2011), T. charitomenos (Hernandes 2018), T. empidonicus Mironov & Galloway 2021, T. longisetus Hernandes 2022, T. machetornis Hernandes 2022, T. pitangi (Mironov 2008), T. reticulatus (Černý 1974), T. sealyi Mironov & Galloway 2021, T. synallaxis Hernandes & Pedroso 2016, and T. vireonis (Hernandes & Pedroso 2016) (Černý 1974; Mironov et al. 2008; Valim & Hernandes 2008, 2010; Mironov & González-Acuña 2011; Hernandes et al. 2016, 2018; Mironov & Galloway 2021; Hernandes 2022).	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9298456CC17FD605B2F95E.taxon	description	(Fig. 11)	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9298456CC17FD605B2F95E.taxon	materials_examined	Material examined. 9 males, 10 females ex Elaenia ridleyana Sharpe, 1888 (Passeriformes: Tyrannidae), BRAZIL, Pernambuco, Fernando de Noronha, Sancho Beach, - 3.855044, - 32.441128, 02 October 2024, band # F 61457, coll. G. Sobral; 1 male, 2 females, same host species, locality and collector, 17 August 2023, # F 79774. Additional material examined. 22 males, 27 females ex Elaenia chiriquensis, BRAZIL, Federal District, Brasília, Fazenda Água Limpa, 26 ° 54 ' S / 49 ° 04 ' W, 13 February 2002, M. F. Kanegae coll.; 1 male, 3 females, ex E. flavogaster, same locality and collector, 07 August 2002. Material deposited at ECZ-UFSC.	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9298456CC17FD605B2F95E.taxon	discussion	Remarks. Originally described from the yellow-bellied elaenia, Elaenia flavogaster (Thunberg, 1822), from Suriname (Černý, 1974), this species was later reported on the same host and also on the lesser elaenia, E. chiriquensis Lawrence, 1865, in Brasília, Brazil (Valim & Hernandes 2010). The Noronha elaenia, E. ridleyana, is herein recorded as a new host for this mite species. This species is characterized by having, in males, epimerites I U-shaped, the rudimentary sclerite rEpIIa absent, the aedeagus reaching the anterior level of adanal suckers, setae h 3 short spiculiform, the prodorsal shield entire, without lateral indentations at the level of scapular setae. The reticulate pattern on the hysteronotal shield is often more distinct in females than in males, although it may be more or less pronounced in each specimen in both sexes. Likewise, minute lacunae on both the prodorsal and hysteronotal shields may be variously expressed in different individuals, and the ventral crest on femur II of females may be variously noticeable, especially depending on the position of legs in the mounted slides. During the examination of specimens, a few minor differences were observed between the specimens from the Noronha elaenia and those of the two previously reported hosts, and from the characteristics given in the original description (Černý, 1974) and subsequent the redescription of this species (Valim & Hernandes 2010). The specimens from Elaenia chiriquensis and E. flavogaster reported by Valim & Hernandes (2010) were herein re-examined (22 males and 27 females from the former and 1 male and 3 females from the latter), and a few corrections for the species diagnosis should be made: trochanteral setae sR III are indeed absent in all those specimens (while it is present in the specimens from E. ridleyana); setae f 2 are absent in specimens from all hosts, despite it was illustrated originally by Černý (1974) and in the redescription of that species by Valim & Hernandes (2010). Although the loss of the setae sR on trochanters III was initially one of the key diagnostic characters of the genus Tyrannidectes (see Mironov et al. 2008), it was recently demonstrated by both molecular (Pedroso et al. 2023) and morphological studies (Mironov & Galloway 2021) that this seta may be present or absent in a particular species of Tyrannidectes.	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9298586CC178EA078BFF04.taxon	description	(Fig. 12)	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9298586CC178EA078BFF04.taxon	materials_examined	Material examined. 4 males, 13 females ex Vireo gracilirostris Sharpe, 1890 (Passeriformes: Vireonidae), BRAZIL, Pernambuco, Sancho Beach, Fernando de Noronha, - 3.855044, - 32.441128, 17. VIII. 2023, coll. C. Licarião, # D 168333; 4 females, same data, # D 168332; 9 females, same data, # D 168331; 9 males and 18 females, 2 nymphs, same data, # D 1683340; 2 females, same data, # D 168330.	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
03A05400FF9298586CC178EA078BFF04.taxon	discussion	Remarks. This species was described from the red-eyed vireo, Vireo olivaceus (Linnaeus, 1766) (Passeriformes: Vireonidae), from Paraná and São Paulo states, Brazil. It was originally described in the genus Amerodectes Valim & Hernandes, 2010; further, Mironov & Galloway (2021) transferred it to Tyrannidectes Mironov, 2008 based on morphological characters of males and females, most noticeably, the presence of a pair of angular extensions on the opisthoventral shield posterior to the level of setae ps 3 in males. This species is remarkable, being the only species of this genus having the prodorsal shield of males transversely split at the level of the scapular setae se and si. The Noronha vireo is herein reported as a new host of this mite species.	en	Hernandes, Fabio A., Licarião, Cecília (2025): Feather mites (Acariformes: Proctophyllodidae and Trouessartiidae) from endemic passerines of Fernando de Noronha Islands, Brazil, with description of two new Trouessartia species. Zootaxa 5692 (2): 277-299, DOI: 10.11646/zootaxa.5692.2.4, URL: https://doi.org/10.11646/zootaxa.5692.2.4
