Nanodectes formicivorae Mironov, 2008

Mironov, Sergey V., Literak, Ivan & Čapek, Miroslav, 2008, New feather mites of the subfamily Pterodectinae (Acari: Astigmata: Proctophyllodidae) from passerines (Aves: Passeriformes) in Mato Grosso do Sul, Brazil, Zootaxa 1947, pp. 1-38 : 32-36

Nanodectes formicivorae Mironov sp. n.

( Figs. 19–21)

Type material. Male holotype ( ZISP 4414 ), 6 male and 10 female paratypes ex Formicivora rufa (Wied-Neuwied, 1831) (Thamnophilidae) , Brazil, Mato Grosso do Sul, Nova Andradina , 22° 15’ S, 53° 21’ W, 30 July 2006, I. Literak and M. Č apek. Holotype, 3 male and 5 female paratypes ( ZISP 4414-4422 ) – ZISP, rest paratypes – PaU.

Male (holotype, measurements for 6 paratypes in parenthesis). Idiosoma, length × width, 245 (240–255) × 113 (108–115), length of hysterosoma 158 (155–162). Prodorsal shield: split into anterior and posterior pieces at level of scapular setae (se, si), antero-lateral extensions short, posterior margin with short bluntly- rounded median extension, total length of shield along midline 77 (75–80), width of posterior part 71 (68–75), surface uniformly punctate; scapular setae se separated by 42 (40–44) ( Fig. 19 A). Inner margins of scapular shields with narrow suprategumental extensions. Humeral shields situated dorso-laterally, narrow. Setae cp situated ventrally, on soft tegument. Setae c2 situated on anterior ends of humeral shields. Subhumeral setae c3 lanceolate, 20 (19–22) × 4–4.5. Hysteronotal shield: greatest length 155 (150–165), width in anterior part 62 (60–65), anterior margin concave, surface uniformly punctate. Distance between prodorsal and hysteronotal shields 20 (17–22). Opisthosomal lobes roughly angular, short with bases of h3 on lobar apices. Terminal cleft angle-shaped with widely rounded anterior end, 15 (14–16) in length. Margins of terminal cleft with narrow membranes forming short and rounded extension on lobar apices. Supranal concavity present, narrow. Setae h1 situated at level of posterior end of supranal concavity. Setae h3 setiform, 48 (46–52) long; setae ps2 18 (15–20) long; setae ps1 minute, about 3 long, situated on margins of terminal cleft at level of setae h2. Distance between dorsal setae: se:c2 48 (48–55), c2:e1 104 (100–106), e1:h3 46 (44–50), h1:h3 24 (18–24), h2:h2 37 (35–42), h3:h3 28 (26–30), ps2:ps2 51 (50–53).

Epimerites I fused into a V, fused part with acute median extension ( Fig. 19 B). Coxal fields I, II without large sclerotized areas. Rudimentary sclerite rEpIIa absent. Coxal fields II, III open. Coxal fields IV with small angle-shaped sclerotized area at bases of trochanters IV. Epimerites IVa absent. Genital arch strongly reduced, represented by sclerotized ring at base of aedeagus; length of aedeagus, anterior margin of genital ring to apex 50 (48–50), width of ring 9 (9–10). Genital papillae separated, situated slightly anterior to base of genital apparatus. Genital shields absent. Anal suckers 8 (8–9) in diameter, corolla with indentations. Adanal shields of ovate form situated antero-lateral to anal suckers. Opisthoventral shields narrow, represented by narrow bands between bases of setae ps2 and h2, inner margins smooth. Setae ps3 situated antero-mesal to anal suckers on soft tegument. Distance between ventral setae: 3b:3a 5 (5–6), 3a:4a 26 (25–28), 4a:g 35 (30– 35), g:ps3 15 (15–17), ps3:ps3 9 (9–11), ps3:h3 28 (27–33).

Legs I slightly thicker than legs II, femora I, II with narrow ventral crests, other segments without processes. Solenidion σ 1 of genu I spiculiform, 20 (20–21) long, slightly shorter than solenidion ω 3 of corresponding tarsus, situated at midlevel of segment. Genual seta cG I, II, mG I, II setiform ( Figs 20 A, B). Solenidia ω 1 of tarsi I, II subequal in length, 13 (12–14) long, solenidion ω 1 of tarsus II noticeably thicker than that of tarsus I. Legs III and IV similar in form and size. Solenidion σ 1 of genu III in proximal part of segment. Seta d of tarsus II slightly longer than corresponding seta f, and seta d of tarsus III subequal to corresponding seta f. Tarsus IV 22 (22–23) long, with small apico-ventral spine bearing seta w; setae d, e buttonlike, seta d situated dorsally in basal half of segment, seta e at apex of segment ( Fig. 20 D).

Female (10 paratypes). Idiosoma, length × width, 375–392 × 135–150, length of hysterosoma 255–270. Prodorsal shield: entire, 90–96 × 85–95, lateral margins with incision extending to bases of setae se, posterior margin with slightly developed median extension, antero-lateral extensions well-developed, rounded apically, setae se separated by 60–65. Scapular shields without suprategumental extensions on inner margin. Humeral shields narrow, situated dorso-laterally. Setae cp situated on ventral margin of humeral shields. Setae c2 situated at anterior end of humeral shields. Setae c3 lanceolate, 22–24 × 4.5–5. Distance between prodorsal and hysteronotal shields 25–30. Anterior and lobar parts of hysteronotal shield completely separated by narrow transverse band of soft tegument ( Fig. 21 A). Anterior hysteronotal shield roughly rectangular in form, anterior margin concave, posterior margin with wide and short median extension, greatest length 200–210, width at anterior margin 85–95, surface uniformly punctate. Length of lobar region 58–68, greatest width 75–82. Lobar shield split into halves by narrow median band of soft tegument. Terminal cleft with contour of inverted Y, anterior part parallel-sided, posterior part with diverging margins, 48–54 long, distance between lobar apices 13–18. Setae h1 on lobar shield, near to its anterior margin. Setae h2 with spindle-like basal enlargement and filiform apical half, total length 70–75, width of enlarged part 5.5–6. Setae ps1 close to inner margins of opisthosomal lobes. Setae h3 thick setiform, 44–52 long, about 2/3 of terminal appendages. Distance between dorsal setae: se:c2 64–68, c2:e1 145–155, e1:h2 64–70, h2:h3 35–40, h1:h2 15–18, h1:h1 55–60, h2:h2 62– 68, h3:h3 26–30.

Epimerites I fused into a narrow U with very thin connection. Lateral parts of coxal fields I, II without wide sclerotized areas ( Fig. 21 B). Epimerites IVa present, angle-shaped. Translobar apodemes of opisthosomal lobes present, not fused to each other anterior to terminal cleft. Epigynum horseshoe-shaped, without lateral extensions. Primary spermaduct slightly enlarged near head of spermatheca, most part of primary spermaduct instinct; secondary spermaducts short and wide, 8–10 long; copulatory opening situated ventrally, between antero-mesal angles of translobar apodemes ( Fig. 20 G). Pseudanal setae ps2, ps3 setiform, seta ps2 situated at level of posterior end of anal opening; distance setae: ps2:ps2 35–44, ps3:ps3 13–15, ps2:ps3 16– 18.

Three distal segments of legs I, II as in male; femur I without ventral crest, femur II with ventral crest. Solenidion σ 1 of genu I thin stick-like, length 32–34, slightly longer than solenidion ω 1 of corresponding tarsus. Genual seta cG I, II, mG I, II setiform. Solenidia ω 1 of tarsi I, II subequal in length, 14–16. Seta d of tarsus II slightly longer than corresponding seta f, and setae d of tarsi III, IV subequal to corresponding seta f. Genu IV with longitudinal dorsal crest, genu III not modified ( Figs. 20 E, F).

Etymology. The specific epithet derives from the generic name of the type host and is a noun in the genitive case.