Feather mites of the genus Trouessartia (Acariformes: Trouessartiidae) from passerines (Aves: Passeriformes) in Georgia, USA Mironov, Sergey V. Chandler, C. Ray Zootaxa 2020 2020-10-09 4860 1 1 54 Mironov and Chandler Mironov and Chandler 2020 [151,735,151,177] Arachnida Trouessartiidae Trouessartia GBIF Animalia Sarcoptiformes 5 6 Arthropoda species passerinae sp. nov.  ( Figs. 1–3, 4A–C)   Type material. Holotypemale ( BMOC20-0303-009), 10 maleand 12 female paratypesfrom  Passerina caerulea(Linnaeus, 1758)( Passeriformes: Cardinalidae), ( SVM18-0530-11/3),  USA, Georgia, Telfair Co., 21 May 2017, coll. C. R. Chandler.  Depositories. Holotype, 5 maleand 6 femaleparatypes—UMMZ, remaining paratypes—ZISP.  Additional material. 3 malesand 3 femalesfrom  Passerina cyanea(Linnaeus, 1766)( Passeriformes: Cardinalidae), ( SVM18-0530-15),  USA, Georgia, Statesboro, GeorgiaSouthern University Campus, 32°25’15”N, 81°47’22”W, 22 April 2015, coll. C. R. Chandler.   Description. MALE ( holotype, ranges for 10 paratypesin parentheses) ( Figs. 1, 3A–C, 4A). Idiosoma, length × width, 445 (420–470) × 210 (200–225), length of hysterosoma 285 (270–300). Prodorsal shield: length along midline 140 (135–145), greatest width posterior to level of scapular setae 160 (150–165), anterior part at level of trochanters II not narrowed, anterolateral extensions rounded, not extending to bases of epimerites Ia between legs I and II, lateral margins not fused with scapular shields, posterior margin straight, surface without ornamentation. Internal scapular setae sispiculiform with filiform apex, 35 (30–35) long, separated by 60 (57–63); external scapular setae seseparated by 100 (100–110). Setae c2with filiform apex, 53 (50–55) long, situated in anteromedian angle of humeral shields. Setae c3narrowly lanceolate, with bidentate apex (with apical and subapical denticles), 25 (18–25) long ( Fig. 3E). Hysteronotal shield completely separated into prohysteronotal and lobar parts, total length from anterior margin to lobar apices excluding lamellae 275 (265–290). Prohysteronotal shield: length along midline 185 (180–195), width at anterior margin 155 (145–165), lateral margins at level of trochanters III with shallow concavities flanked by bean-shaped sclerotized patches, dorsal hysterosomal apertures (DHA) absent, surface without ornamentation. Dorsal setae d1, d2, e2present. Setae f2absent. Length of lobar shield 90 (85–95). 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 h2separated by narrow parallel-sided terminal cleft. Length of terminal cleft from anterior end to lobar apices 28 (25–28); length from anterior end to posterior margin of terminal lamellae 50 (50–55), width 5 (5–6). Terminal lamellae semi-ovate, widely rounded posteriorly, with smooth margins, length from bases of setae h3to lamellar apices 28 (28–30), greatest width 25 (25–30). Distance between dorsal setae: c2:d270 (70–75), d2:e295 (90–98), e2:h275 (70–78), h2:h322 (20–22), h2:h240 (40–43), h3:h328 (28–30), d1:d243 (42–50), e1: e242 (40–45), ps1:h38 (7–8). Epimerites I free. Rudimentary sclerites rEpIIa small ovate. Genital apparatus: length excluding basal sclerite 45 (45–48), greatest width 25 (20–25), aedeagus short cone-shaped, epiandrum (pregenital sclerite) roughly ovate, latigenital sclerites absent, distal ends of parameres without denticles ( Fig. 4A). Anterior genital papillae slightly larger and more distant from midline than posterior ones. Postgenital plaque large semicircular. Setae gfiliform (not enlarged basally), approximately half as long as distance between setae gand ps3, their bases well separated from each other and situated on crescent-shaped genital shield. Apophyses of adanal apodemes ridge-shaped, anterior end with roughly rectangular or rounded tubercle. Lateral margins of opisthosoma with narrow membranes at level of adanal suckers. Translobar apodeme present. Adanal shields represented by small triangular sclerites around bases of setae ps3. Adanal suckers 13 (13–15) in diameter. Inner ends of epimerites IIIa extending to level of setae 4b, without noticeable extensions on inner margins. Epimerites IVa as plates of irregular form, with anterior ends extending to level of setae g. Setae 4bsituated anterior to level of setae 3a; setae gposterior to level of setae 4a. Distance between ventral setae: 4b:3a10 (8–10), 4b:g90 (82–98), 4a:g12 (12–15), g:ps335 (32–38), ps3: h3100 (95–105), g:g10 (10–15). Setae cG, mGof genua I, II filiform. Genual solenidia σI and σII situated at midlength of corresponding genua ( Fig. 3A, B). Trochanteral setae sRIII narrowly lanceolate, with acute apex, 15 (15–17) long. Legs IV with ambulacral disc extending to level of setae h3. Tarsus IV 33 (30–33) long; modified setae dbarrel-shaped, with discoid cap, situated in distal one third of this segment; modified setae ebutton-like, without cap, situated apically ( Fig. 3D). Length of solenidia: σI 55 (50–56), σII 12 (10–14), σIII 25 (22–23), φIV 38 (33–38). FEMALE (range for 10 paratypes) ( Figs. 2, 3F, G, 4B, C). Idiosoma, length × width, 495–540 × 210–240, length of hysterosoma 335–340. Prodorsal shield: shaped as in male, 140–155 long, 150–175 wide, surface without ornamentation. Setae sifiliform, 30–33 long, separated by 60–65; setae seseparated by 100–110. Setae c2with filiform apex, 48–53 long, situated in anteromedial angle of humeral shields. Setae c3narrowly lanceolate, with acute apex, 21–23 long. Hysteronotal shield: length from anterior margin to posterior tips 305–345, width at ante- rior margin 150–170, lateral margins at level of trochanters III with shallow concavities flanked by bean-shaped sclerotized patches, dorsal hysterosomal aperture (DHA) absent, median area from level of setae c3to trochanters IV with poorly distinct small ovate lacunae, posterior part between levels of setae e1and supranal concavity with small longitudinal dash-like lacunae. Dorsal setae d1, d2, e2present. Setae h1narrowly lanceolate, 24–26 long, situated of setae h2, 20–23 from corresponding lateral margins of hysteronotal shield. Width of opisthosoma at level of setae h290–105. Setae ps1situated 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 135–145, length from free margin of interlobar membrane to apices 96–105, greatest width of cleft 38–45. Interlobar membrane occupying anterior 1/8th of terminal cleft. External copulatory tube short conical, situated on free margin of interlobar membrane, 9–13 long; basal guides of copulatory tube and primary spermaduct guide well developed. Distance between dorsal setae: c2:d275–85, d2:e288–98, e2:h258–63, h2:h358–65, h2:h275–87, h3: h347–63, d1:d243–48, e1: e235–43, h1:h215–18, h1:h145–50, ps1:h315–16.   FIGURE 1.  Trouessartia passerinae  sp. n., male. A—dorsal view, B—ventral view.   FIGURE 2.  Trouessartia passerinae  sp. n., female. A—dorsal view, B—ventral view. Epimerites I free. Epigynum 42–43 long, 92–102 wide. Inner margins of epimerites IIIa with blunt-angular extension. Epimerites IVa present. Adanal sclerites barely distinct or absent. Setae f2, ps2present. Head of spermatheca with smooth semi-ovate peak, primary spermaduct without enlargement, secondary spermaducts 28–30 long ( Fig. 4B). Legs I, II as in males ( Fig. 3A, B). Trochanteral setae sRIII narrowly lanceolate, acute apically, 15–18 long. Legs IV with ambulacral disc extending to setae ps1. Length of solenidia: σI 50–55, σII 12–13, σIII 22–25.   Differential diagnosis. Among previously described species referred to the  capensisspecies group,  Trouessartia passerinae  sp. n.is most similar to  T. capensisBerla, 1959 inhaving a wide semicircular postgenital plaque and bases of setae gdistant from each other in males.  Trouessartia passerinae  sp. n.readily differs from  T. capensisby the following features: in both sexes, the lateral margins of the hysteronotal shield at the level of trochanters III are shallowly concave and flanked by slightly curved sclerotized patches; in males, setae gare filiform, and the genital shield is crescent-shaped; in females, the external copulatory tube is short and conical (9–13), setae h1are 24–26 long and barely extend to the anterior margin of the interlobar membrane, and the posterior 1/3 of the hysteronotal shield bears numerous longitudinal dash-shaped lacunae. In both sexes of  T. capensis, the lateral margins of the hysteronotal shield at the level of trochanters III have small and deep incisions flanked by a C-shaped sclerotized patch; in males, setae gare widened and flattened in their basal two thirds, and the genital shield is trapezoidal in shape; and in females, the external copulatory tube is 34–38 long, setae h1are 46–56 long and distinctly extend beyond the free margin of the interlobar membrane, and the posterior 1/3rd of the hysteronotal shield bears oblique ovate lacunae.   Etymology. The specific epithet is taken from the generic name of the typehost and is a noun in the genitive case.