Trouessartia tigrina Mironov and Chandler, 2020

Mironov, Sergey V. & Chandler, C. Ray, 2020, Feather mites of the genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Aves: Passeriformes) in Georgia, USA, Zootaxa 4860 (1), pp. 1-54 : 40-44

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Trouessartia tigrina Mironov and Chandler

sp. n.

Trouessartia tigrina Mironov and Chandler , sp. n.

( Figs 26–28 View FIGURE 26 View FIGURE 27 View FIGURE 28 )

Type material. Holotype male ( BMOC 20-0303-004), 2 male and 17 female paratypes from Setophaga tigrina (Gmelin, JF, 1789) ( Passeriformes : Parulidae ) ( SVM 18-0530-18/2), USA, Georgia, Georgia Southern University Campus, 32°25’15”N, 81°47’22”W, 29 September 2017, coll. C. R. Chandler.

Depositories. Holotype, 1 male and 8 female paratypes—UMMZ, remaining paratypes—ZISP.

Description. MALE (holotype, ranges for 2 paratypes in parentheses) ( Figs. 26 View FIGURE 26 , 28 View FIGURE 28 A–D, G). Idiosoma, length × width, 500 (470–485) × 250 (240–250), length of hysterosoma 330 (330–340). Prodorsal shield: length along midline 140 (130–140), greatest width posterior to level of scapular setae 165 (155–160), anterior part at level of trochanters II not narrowed, anterolateral extensions angular, extending to bases of epimerites Ia, lateral margins not fused with scapular shields, posterior margin straight, surface of posterior part with faint reticulate ornamentation. Internal scapular setae si spiculiform, 30 (27–30) long, separated by 60 (55–60); external scapular setae se separated by 110 (105–115). Setae c2 spiculiform, 52 (47–55) long, situated in anteromedian angle of humeral shields. Setae c3 narrowly lanceolate, with blunt apex, 22 (22–25) long. Hysteronotal shield completely separated into prohysteronotal and lobar parts, total length 315 (300–315). Prohysteronotal shield: length along midline 205 (200–210), width at anterior margin 170 (160–170), lateral margins at level of trochanters III with incision flanked by C-shaped heavily sclerotized patch, DHA absent, surface without ornamentation. Dorsal setae d2, e2 present. Setae d1, f2 absent. Length of lobar shield excluding terminal lamellae 115 (100–115). 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 h2 separated by narrow terminal cleft with slightly concave margin; length of cleft from anterior end to lobar apices 25 (23–25); length from anterior end to apices of terminal lamellae 58 (55–58), width 5 (5–6). Terminal lamellae semi-ovate, with slightly attenuate apices, with smooth margins, length from bases of setae h3 to lamellar apices 40 (35–40), greatest width 25 (25–37). Distance between dorsal setae: c2: d2 78 (75–78), d2:e2 115 (110–115), e2:h2 85 (78–85), h2:h3 27 (22–27), h2:h2 43 (42–43), h3:h3 35 (32–35), e1: e2 50 (50–55).

Epimerites I free. Rudimentary sclerites rEpIIa large, ovate, with small lacuna. Genital apparatus: length excluding basal sclerite 60 (55–60), greatest width 30 (28–30), epiandrum ovate, latigenital sclerites absent, distal ends of parameres without denticles. Aedeagus shaped as thick conoid (fustum). Anterior and posterior genital papillae subequal in size, anterior papillae more distant from midline than posterior ones. Postgenital plaque small trapezoidal, with small concavity on posterior margin. Setae g long, slightly thickened in basal part, bases of these setae separated, sclerotized areas around them fused into a small inverted Y. Apophyses of adanal apodemes shaped as narrow ridges with rounded tubercle at anterior end. Lateral margins of opisthosoma with narrow lateral membranes. Translobar apodeme present. Adanal shields represented by small triangular sclerotized areas around bases of setae ps3. Adanal suckers 18 (15–18) in diameter. Inner ends of epimerites IIIa with apices extending beyond level of setae 4b and without extensions on inner margins. Epimerites IVa short and wide, with anterior ends not reaching level of basal sclerite. Setae 4b situated anterior to level of setae 3a; setae g posterior to level of setae 4a. Distance between ventral setae: 4b:3a 7 (7–10), 4b:g 95 (87–92), 4a:g 7 (7–10), g:ps3 70 (68–70), ps3: h3 105 (97–100).

Setae cG, mG of genua I, II filiform. Genual solenidia σ I and σ II situated at midlength of corresponding genua ( Fig. 28A, B View FIGURE 28 ). Trochanteral setae sR III narrowly lanceolate, with blunt apex, 18 (15–17) long. Legs IV with ambulacral disc extending to level of setae h2. Tarsus IV 43 (40–43) long; modified setae d barrel-shaped, with discoid cap, situated in distal one third of this segment; modified setae e button-like, without cap, situated apically ( Fig. 28D View FIGURE 28 ). Length of solenidia: σ I 55 (50–55), σ II 13 (12–13), σ III 28 (25–28), φ IV 40 (40–43).

FEMALE (range for 10 paratypes) ( Figs. 27 View FIGURE 27 , 28E, F View FIGURE 28 ). Idiosoma, length × width, 545–585 × 240–265, length of hysterosoma 380–410. Prodorsal shield: shaped as in male, 140–145 long, 165–175 wide, surface without ornamentation. Setae si thin spiculiform, 27–33 long, separated by 60–64; setae se separated by 110–115. Setae c2 spiculiform, 45–50 long, situated in anteromedial angle of humeral shields. Setae c3 narrowly lanceolate, with blunt apex, 25–28 long. Hysteronotal shield: length from anterior margin to bases of setae h3 345–370, width at anterior margin 110–120, lateral margins at level of trochanters III with incision flanked by C-shaped heavily sclerotized patch, DHA absent, median area from anterior margin to level of setae e1 with small circular and irregularly-shaped lacunae, area between levels of setae e1 and e2 with small ovate lacunae, and area between setae e2 and h1 with large ovate lacunae. Dorsal setae d2, e2 present. Setae d1 absent. Setae h1 narrowly lanceolate, 30–34 long, situated antero-mesal to bases of setae h2, 25–28 from corresponding lateral margins of hysteronotal shield, not extending to free margin of interlobar membrane. Width of opisthosoma at level of setae h2 110–120. Setae ps1 situated dorsally, 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 155–165, length from free margin of interlobar membrane to apices 105–115, greatest width 50–58. Interlobar membrane occupying anterior 1/5th of terminal cleft. External copulatory tube straight finger-like with bluntly rounded apex, situated on free margin of interlobar membrane, 28–35 long; basal guide of copulatory tube present, primary spermaduct guide in supranal concavity well developed. Distance between dorsal setae: c2:d2 75–85, d2:e2 105–110, e2:h2 58–95, h2:h3 75–80, h2:h2 85–95, h3:h3 75–80, e1: e2 45–48, h1:h2 15–18, h1:h1 47–55, ps1:h3 13–20.

Epimerites I free. Epigynum 42–48 long, 95–105 wide. Inner margins of epimerites IIIa with denticle-like extension. Epimerites IVa short and wide. Anal opening with a pair of adanal sclerites. Setae f2, ps2 present. Head of spermatheca with semi-ovate extension, primary spermaduct without enlargement, secondary spermaducts 25–28 long ( Fig. 28E View FIGURE 28 ).

Legs I, II as in males ( Fig. 28A, B View FIGURE 28 ). Trochanteral setae sR III narrowly lanceolate, with blunt apex, 17–20 long. Legs IV with ambulacral disc extending to midlength between setae h2 and h3. Length of solenidia: σ I 45–53, σ II 10–13, σ III 20–23.

Differential diagnosis. The new species, Trouessartia tigrina sp. n., belongs to the subgroup lacking setae d1 and is most similar to T. ruticilla in having, in males, the inner margins of the terminal lamellae slightly convex and setae g long and moderately thickened, and, in females, dorsal setae h1 not extending to the free margin of the interlobar membrane and the external copulatory tube finger-shaped. The new species differs from T. ruticilla by the following features: in males of T. tigrina , the terminal lamellae are longer (35–40), the rudimentary sclerites rEpIIa are ovate with a small lacuna, and the length of the idiosoma is 470–500; in females, the area immediately anterior to the bases of setae h1 bears over 10–15 large ovate lacunae, which are distinctly larger than the small lacunae between the levels of setae e1 and e2 ( Fig. 28F View FIGURE 28 ), and the length of the idiosoma is 545–585. In males of T. ruticilla , the terminal lamellae are 25–30 long, rudimentary sclerites rEpIIa are small ovate without lacuna, and the length of the idiosoma is 410–440; in females, the entire area between the levels of setae e1 and h1 bears mainly small ovate lacunae ( Fig. 27F View FIGURE 27 ), and the length of idiosoma is 495–525.

Etymology. The specific epithet is taken from the specific name of the type host and is a noun in apposition.


Departamento de Geologia, Universidad de Chile