Trouessartia noronhaensis, Hernandes & Licarião, 2025

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), pp. 277-299 : 279-285

publication ID

https://doi.org/10.11646/zootaxa.5692.2.4

persistent identifier

https://treatment.plazi.org/id/03A05400-FF9F-9842-6CC1-7BA2018DFC7C

treatment provided by

Plazi

scientific name

Trouessartia noronhaensis
status

sp. nov.

Trouessartia noronhaensis sp. nov.

urn:lsid:zoobank.org:act:

( Figs 1–5 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 )

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, # F79770 View Materials , coll. L. Amaral; other paratypes: 1 male, 4 females, same data, # F79771 View Materials ; 2 males, 1 female, same data, # F79772 View Materials , coll. C. Licarião; 8 males, 9 females, same data, # F61452 View Materials , 02 October 2024, coll. L. Amaral. GoogleMaps

Description. MALE ( holotype, range for 5 paratypes in parentheses) ( Figures 1 View FIGURE 1 , 3A–D View FIGURE 3 , 4A View FIGURE 4 , 5A, C, D View FIGURE 5 ). Length of idiosoma from anterior end to bases of setae h3 429 (445–471), greatest width of idiosoma at level of setae d1 189 (182–193). Length of hysterosoma from sejugal furrow to bases of setae h3 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 1A View FIGURE 1 ). 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 c2 thin, setiform, 27 (37–47) long. Setae c3 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 d2 and e1, 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 d2 to e2. Dorsal setae d1, d2 present, minute. Setae h1 inserted dorsally between setae ps2 and h2. 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 h2 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 ps1 7 (5–7). Lamellae roughly kidney-shaped, margins smooth, length from bases of setae h3 to lamellar apices 26 (25–29), width of each lamella at level of setae h3 36 (35–42). Setae h2 274 (221–263) long, setae h3 155 (127–188) long. Distance between levels of dorsal setae and setal pairs: c2:d2 79 (73–83), d1:d2 27 (37–46), e1: e2 43 (37–45), e2:h2 77 (73–81), h2:h3 25 (21–25), h2:h2 45 (41–47), h3:h3 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 1B View FIGURE 1 , 5E View FIGURE 5 ), 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 4a. Apophyses of adanal apodemes as small spines. Translobar apodeme present. Setae ps3 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 4b situated slightly anterior to level of setae 3a, setae g and 4a roughly at the same transverse level. Distance between ventral setae: 4b:3a 8 (5–14), 4b:g 80 (80–84), g:ps3 59 (56–68), ps3:ps3 42 (41–45).

Legs IV with ambulacral disc extending to or slightly beyond level of setae h3. 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 3D View FIGURE 3 ). 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), ω1 of tarsus I 22 (23–25), ω3 of tarsus I 31 (34–35), ω1 of tarsus II 25 (24–25).

FEMALE (range for 5 paratypes) ( Figures 2 View FIGURE 2 , 3E View FIGURE 3 , 4B–C View FIGURE 4 , 5B, F, G View FIGURE 5 ). 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 2A View FIGURE 2 ). 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 c2 thin setiform, 42–53 long. Setae c3 narrowly lanceolate, without subapical tooth, 21–26 in length. Hysteronotal shield: length from anterior margin to bases of setae h3 303–333, width at largest part at level of setae d1 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 d1, d2 present, minute. Setae h1 thin piliform, 13–17 long, situated antero-mesal to bases of setae h2. Distance between bases of h1 and lateral margins of hysterosoma 12–17. Width of opisthosoma at level of setae h2 107–116. Setae ps1 positioned dorsally on opisthosomal lobes, near bases of setae h3, equidistant from outer and inner margins of lobe. Distance from bases of setae h3 to membranous apices of lobes 48–54. Setae f2 present, minute, posterolateral to ps2. Setae h2 267–309 long, setae h3 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 h3 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 4C View FIGURE 4 , secondary spermaducts about 25 long. Distance between levels of dorsal setae and setal pairs: c2:d2 79–91, d1:d2 45–47, d2:e2 95–104, e1: e2 46–53, e2:h2 66–71, h1:h1 56–65, h1:h2 21–25, h2: h2 88–99, h3:h3 65–71.

Epimerites I free. Epigynum 47–50 in length, 80–102 in width ( Figure 2B View FIGURE 2 ). Epimerites IVa present. Adanal shields present. Setae ps3 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 ps1. 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, ω1 of tarsus I 23–24, ω3 of tarsus I 34–38, ω1 of tarsus II 25–28.

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 h1 are short and piliform. Males of Trouessartia noronhaensis sp. nov. differ from the latter in having the adanal shields small and round (bearing setae ps3), 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.

Etymology. The specific name refers to the type locality for this species, the Island of Fernando de Noronha.

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