Gabucinia neotropica, Hernandes, 2020

Hernandes, Fabio A., 2020, A review of the feather mite family Gabuciniidae Gaud & Atyeo (Acariformes Astigmata: Pterolichoidea) of Brazil, with descriptions of eleven new species, Zootaxa 4747 (1), pp. 1-53 : 8-11

Gabucinia neotropica sp. nov.

( Figs. 4–6 )

Type material. Holotype male (#4704), paratypes 29 males and 26 females (#4705–4747) ex Cyanocorax cristatellus (Temminck, 1823) ( Passeriformes : Corvidae ), roadkilled specimen, BRAZIL, Goiás State, Caçu, 18º 33’S, 51º 07W, 26 April 2010, A.J. Andrade col.

Depositories: Holotype and most paratypes at UFSC, 2 male and 2 female paratypes at MGAB and ZISP.

Additional material examined: 2 males, 3 females, and 6 nymphs ex Cyanocorax chrysops (Vieillot, 1818) , roadkilled specimen, BRAZIL, São Paulo State, Nova Luzitânia , 13 July 2014, A. Gomes col.

MALE ( Figs. 4 , 6 A–E). (Holotype, range for five paratypes in parentheses). Gnathosoma roughly square, length including palps 69 (67–77), greatest width at base 66 (60–67). Idiosoma length from anterior end to bases of setae h3 on lobar apices 424 (410–437), greatest width at level of humeral setae 244 (229–262); length of hysterosoma 320 (318–327). Prodorsal shield: occupying almost entire prodorsum, antero-lateral extensions protruding to margins of propodosoma between trochanters I and II and fused with epimerites Ia, antero-lateral margins heavily sclerotized, lateral margins with narrow and deep areas of light sclerotization (incisions) towards bases of setae se, posterior margin with shallow concavity, lateral and posterior borders of shield indistinct in some specimens, greatest length 83 (75–84), width at posterior margin 114 (106–121). Setae vi thin spiculiform, 28 (21–28) long, extending to bases of palps. Setae si thick spiculiform, 40 (30–40) long. Distance between bases of scapular setae: se: se 70 (70–73), si: si 31 (30–33). Subhumeral setae c3 lanceolate with short apical filament, length × width, 19 (18–22) × 3 (3–4). Hysteronotal shield: greatest length from anterior margins to bases of setae h3 292 (295–308), length along midline 172 (167–182), width at anterior margin 174 (161–166), anterior margin poorly defined, surface with faint reticulate ornamentation. Lateral bands distinct. Lobar areas of hysteronotal shield not separated from main body of hysteronotal shield. Supranal concavity parallel-sided. Setae c2 thin spiculiform, 24 (20–28) long, situated off hysteronotal shield, cupules ia immediately posterior to their bases. Setae e1 situated at level of hysteronotal cupules im. Terminal cleft triangular, lobes diverging, length of cleft from anterior end to lobar apices (bases of setae h3) 69 (69–93), width at level of setae h1 146 (122–146). Inner margins of terminal cleft straight, without incisions, posterior ends of opisthosomal lobes with small semicircular membranous extensions. Setae e2 spiculiform 31 (26–31) long, with apices not extending to level of cupules ip; setae f2 spiculiform, 22 (22–29) long, situated at level of setae h2, setae h1 spiculiform, 34 (32–37) long, 3 (3) wide, situated slightly posterior to level of setae h2. Distances between bases of dorsal setae and gland openings: c2: d2 95 (85–100), d2: e2 126 (130–136), e2: h3 77 (75–77), d2: gl 53 (51–57), h3: h3 145 (140–155), h2: h2 151 (140–153), d1: d2 32 (28–32), e1: e2 81 (78–85).

Epimerites I, II without inflated bases. Epimerites I with tips simple, parallel, not extending to bases of coxal setae 1a. Epimerites II almost straight. Genital arch apex at level of trochanters IV, genital arch 25 (25–29) × 21 (21–29), aedeagus not extending to its base. Bases of setae 4a separated, close to posterior tips of genital arch. Setae 4b slightly posterior to level of setae 3a. Setae g at level of posterior pair of genital papillae. Distances between ventral setae: 4b: g 40 (37–44), g: 4a 45 (43–55), 4a: ps3 39 (34–41), ps3: ps3 95 (89–105), 4a: 4a 24 (28–31). Adanal suckers 27 (24–27) in diameter, corolla with 15–17 rounded denticles.

Femora I, II without ventral crest. Seta cG of genu I spiculiform, 30 (24–30) long, subequal in length to this segment. Solenidion σ 1 of genu I 8 (8–10) long, about three times longer than solenidion σ 2. Solenidion σ of genu III situated in mid part of this segment. Solenidion φ of tibia IV about half as long as corresponding tarsus. Tarsus IV with setae d and e minute spine-like. Legs IV with distal half of tarsus extending to level of lobar apices. Length of tarsi: I 44 (43–46), II 47 (47–52), III 57 (53–57), IV 57 (57–63). Ambulacral disc of tarsus I slightly larger than those of tarsi II–IV. Length of solenidia: σ1 I 8 (8–10), σ II 4 (4–6), σ III 8 (8–11), ω1 I 15 (11–15), ω1 II 20 (20–23).

FEMALE ( Figs. 5 , 6F, G ) (range for five paratypes). Gnathosoma, length × width, 84–94 × 73–80. Idiosoma, length × width, 464–515 × 266–288, length of hysterosoma 354–390. Prodorsal shield shaped as in male, 89–99 × 114–126. Setae vi thin spiculiform, 27–30 long, not reaching bases of palps. Setae si thick spiculiform, 37–42 long. Distance between bases of scapular setae: se: se 76–82, si: si 34–40. Subhumeral setae c3 lanceolate with apical filament, length × width 23–27 × 4–5. Hysteronotal shield: entire, opisthosomal part with well-outlined U-shaped unsclerotized area opened posteriorly. Main body of hysteronotal shield: anterior margin poorly defined, straight at level of setae c1, anterior angles rounded, posterior end with wide median extension stretching from level of setae e2 to that of h2, greatest length (from anterior margin to end of extension) 339–383, width at anterior margin 184–212, surface with faint reticulate ornamentation. Postero-lateral margins of opisthosoma darkly sclerotized, bearing setae f2, h2, h3 and ps1. Lateral bands well developed. Posterior margin of opisthosoma widely rounded. Setae c2 spiculiform, 28–32 long, situated off hysteronotal shield; cupules ia postero-mesal to them and also off this shield. Setae d2 short piliform, 8–12 long. Setae e1 slightly posterior to level of hysteronotal gland openings gl. Setae e2 thin spiculiform, length × width 15–18 × 2, setae f2 thin piliform 15–21 long, setae h1 short piliform, 6–10 long situated on margins of median extension of hysteronotal shield. Distances between dorsal setae and gland openings: c2: d2 112–121, d2: e2 147–158, e2: h3 81–92, d2: gl 58–66, h1: h1 60–71, h2: h2 92–114, h3: h3 55–71.

Epimerites I, II without basal inflation. Epimerites I not extending to setae 1a. Epigynum horseshoe-shaped, 60–77 long, 65–79 wide. Setae 4b situated on epigynum, at midlevel of its branches. Setae 4a situated posterior to genital papillae, at level of trochanters IV. Copulatory opening terminal, immediately posterior to anal opening. Distances between ventral setae: 4b: g 37–48, 4b: 3a 14–30, g: 4a 27–50, ps2: ps3 16–36, ps2: ps2 100–133.

Femora I, II without ventral crest. Setae cG of genu I spiculiform, 28–30 long, about as long as this segment. Legs IV with ambulacrum extending slightly beyond posterior end of opisthosoma. Length of tarsi: I 45–51, II 51–58, III 57–65, IV 70–73. Length of solenidia: σ1 I 9–13, σ II 5–7, σ III 9–12, ω1 I 13–16, ω1 II 24–25.

Differential diagnosis. Gabucinia neotropica sp. nov. is similar to G. delibata in having scapular setae si as thick as se; in G. gladiscapulata , setae si are thicker and more robust than se. Gabucinia neotropica differs from G. delibata in having in both sexes setae c3 thick, lanceolate, and enlarged at the base; in males, setae e2 approximately equal in length to setae f2 and reach about half the distance to the bases of setae h2, and setae g are at the level of the posterior genital papillae; in females, setae si are slightly longer than the distance between their bases. In both sexes of G. delibata , seta c3 is thin and piliform through its entire length; in males, setae e2 are longer than setae f2 and reach about 2/3 the distance to bases of corresponding setae h2, and setae g are posterior to the posterior pair of genital papillae; and in females, setae si are nearly twice as long as the distance between their bases and can reach the base of setae se of the opposite side.

Etymology. The specific name refers to the first Gabucinia species described from the Neotropical region.

Figures

FIGURE 4. Gabucinia neotropica sp. nov., male: dorsal (A) and ventral (B) views.

FIGURE 5. Gabucinia neotropica sp. nov., female: dorsal (A) and ventral (B) views.

FIGURE 6. Gabucinia neotropica sp. nov.: legs I–IV of male (A–D), dorsal opisthosoma of male (E), tarsus IV of female (F), spermatheca of female (G).