Proaposolenidia plumbea, 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 : 24-28

Proaposolenidia plumbea sp. nov.

( Figs. 16–18 )

Type material: Male holotype (#4871), paratypes 16 males and 9 females (#4872–4896) ex Ictinia plumbea (Gmelin, 1788) ( Accipitriformes : Accipitridae ), specimen found dead, BRAZIL, São Paulo State, Pedreira, 22°44ʹ S, 46°54ʹ W, November 2010, D.V. Boas-Filho col. (#890) .

Depository: Holotype and paratypes at UFSC.

MALE ( Figs. 16 , 18 A–D, F). (Holotype, range for five paratypes in parentheses). Gnathosoma roughly trapezoidal, length including palps 62 (60–67), greatest width at base 68 (60–69). Idiosoma length from anterior end to bases of setae h3 on lobar apices 416 (392–416), greatest width at level of humeral setae 239 (228–247); length of hysterosoma 289 (269–285). Prodorsal shield: occupying anterior half of prodorsum, without a transverse fragment posterior to scapular setae, 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 barely discernible, posterior end not encompassing scapular setae se and si, posterior margin sinuous, greatest length 68 (60–71), width at posterior margin 101 (99–123). Setae vi thin piliform, 41 (27–41) long, extending to bases of palps. Setae si 79 (79–90) long, as robust as se. Distance between bases of scapular setae: se: se 73 (75–79), si: si 27 (27–30). Subhumeral setae c3 long setiform, length × width 100 (73–100) × 2. Hysteronotal shield: greatest length from anterior margins to bases of setae h3 223 (200–224), length along midline 141 (128–155), width at anterior margin 174 (149–165), anterior margin deeply and irregularly concave, anterior angles acute, surface with reticulate ornamentation. Lateral bands distinct. Lobar areas of hysteronotal shield not separated from main body of hysteronotal shield. Supranal concavity large, semicircular. Setae c2 spiculiform, 43 (40–47) long, situated off hysteronotal shield, cupules ia immediately posterior to their bases. Setae e1 situated slightly posterior to level of cupules im. Anterior part of terminal cleft narrow, trapezoidal in shape; posterior part almost twice as wide, posterior parts of opisthosomal lobes bent medially. Length of terminal cleft from anterior end to lobar apices (bases of setae h3) 80 (64–75), width at level of setae h1 74 (67–78). Inner margin of opisthosomal lobes with rounded membranous ledges at level of setae f2 and with strong semicircular incision immediately anterior to bases of setae h1, posterior ends of opistho- somal lobes with semicircular membranous extensions. Setae e2 setiform 52 (50–54) long, with apices extending slightly beyond level of setae h2; setae f2 spiculiform, 44 (39–50) long, situated anterior to level of setae h2, setae h1 lanceolate, 33 (26–33) long, 4 (3–4) wide, situated between levels of setae h2 and h3. Distances between bases of dorsal setae and gland openings: c2: d2 94 (88–96), d2: e2 107 (98–108), e2: h3 61 (64–66), d2: gl 16 (15–19), h3: h3 93 (83–97), h2: h2 110 (99–113), d1: d2 24 (21–28), e1: e2 81 (65–81).

Epimerites I, II with inflated bases. Bases of epimerites I connected by wide transverse bridge, their tips simple, not extending to bases of coxal setae 1a. Epimerites II slightly curved. Genital apparatus apex at midlevel of trochanters IV, genital arch 14 (15–19) × 14 (10–14), aedeagus not extending to its base. Bases of setae 4a separated. Setae 4b and 3a approximately at the same transverse level. Setae g at level of anterior pair of genital papillae. Adanal shields as small teardrop-shaped sclerites at level of anterior margin of anal opening. Distances between ventral setae: 4b: g 26 (20–33), g: 4a 72 (64–73), 4a: ps3 33 (33–36), ps3: ps3 94 (85–96), 4a: 4a 16 (14–17). Adanal suckers 18 (18–20) in diameter, corolla with 14–15 rounded denticles.

Femora I, II without ventral crest. Seta cG of genu I spiculiform, 81 (70–81) long, slightly exceeding combined length of genu and tibia I. Solenidion σ 1 of genu I 14 (11–14) long. Solenidion σ of genu III absent. Solenidion φ of tibia IV shorter than corresponding tarsus. Tarsus IV with seta d and e minute spine-like. Legs IV with distal half of tarsus extending beyond level of lobar apices. Length of tarsi: I 51 (45–52), II 72 (59–72), III 82 (74–82), IV 82 (82–89). Ambulacral disc of tarsus I pear-shaped and noticeably larger than more circular-shaped ambulacra of tarsi II–IV. Length of solenidia: σ1 I 14 (11–14), σ II 6 (5–7), ω1 I 15 (12–15), ω1 II 17 (16–19).

FEMALE ( Figs. 17 , 18E, G ) (range for five paratypes). Gnathosoma, length × width, 69–75 × 71–75. Idiosoma, length × width, 440–465 × 262–291, length of hysterosoma 301–315. Prodorsal shield shaped as in male, 73–86 × 100–148. Setae vi thin piliform, 24–32 long, extending to bases of palps. Setae si 94–105 long, as robust as se. Distance between bases of scapular setae: se: se 82–89, si: si 31–37. Subhumeral setae c3 long setiform, length × width 96–125 × 2. Hysteronotal shield: entire, roughly rectangular, anterior margin almost straight, anterior angles square, posterior end extending to bases of setae e2 and h1, with narrow median extension reaching posterior margin of opisthosoma and encompassing bases of setae ps1, greatest length 189–200, width at anterior margin 153–181, surface with faint transverse striation on the anterior half gradually changing into a longitudinal pattern on the posterior half. Lateral bands well developed. Postero-lateral margins of opisthosoma around bases of setae h2, h3 poorly sclerotized. Posterior margin of opisthosoma semi-rounded. Setae c2 spiculiform, 53–59 long, situated off hysteronotal shield; cupules ia postero-mesal to them and also off this shield. Setae d2 short piliform, 17–22 long. Setae e1 well posterior to level of hysteronotal gland openings gl. Setae e2 setiform, length × width 31–46 × 2, setae f2 short piliform 23–29 long, setae h1 short piliform, 8–12 long, situated on the posterior margins of main hysteronotal shield. Distances between dorsal setae and gland openings: c2: d2 110–121, d2: e2 113–127, e2: h3 51–60, d2: gl 10–15, h1: h1 72–82, h2: h2 80–84, h3: h3 62–66.

Epimerites I, II with basal inflation. Bases of epimerites I connected by wide transverse bridge, their tips not extending to setae 1a. Epigynum horseshoe-shaped, 30–45 long, 68–78 wide. Setae 4b situated off epigynum. Setae 4a situated at level of anterior pair of genital papillae. Copulatory opening subterminal, immediately posterior to anal opening. Distances between ventral setae: 4b: g 54–62, 4b: 3a 30–39, g: 4a 15–26, ps2: ps3 13–20, ps2: ps2 65–74.

Femora I, II without ventral crest. Setae cG of genu I long spiculiform, 76–90 long, longer than genu and tibia I combined. Legs IV with entire tarsus extending beyond posterior end of opisthosoma. Length of tarsi: I 47–58, II 68–78, III 89–95, IV 103–111. Length of solenidia: σ1 I 15–19, σ II 6–9, ω1 I 14–16, ω1 II 18–21.

Differential diagnosis. Proaposolenidia plumbea sp. nov. is most similar to P. ostoda ( Gaud, 1983) comb. nov. (see discussion on Hieracolichus below) in having setae si long and as robust as se, and in lacking solenidion σ on genua III. The new species can be distinguished from P. ostoda by the following features: in males, setae c1 are inserted on the striated integument (sejugal area), h1 are shorter, approximately equal to the distance between bases of setae e2 and f2, and the posterior parts of the opisthosomal lobes are convergent; in females, the anterior margin of hysteronotal shield is straight, and setae d1 are inserted on the border of this shield. In males of P. ostoda , setae c1 are inserted on the anterior margin of the hysteronotal shield, h1 are longer, about 1.3 times the distance between setae e2 and f2, and the posterior parts of the opisthosomal lobes are nearly parallel; in females, the anterior margin of the hysteronotal shield is convex, and setae d1 inserted on the striated integument between the prodorsal and hysteronotal shields.

Remark. This species was referred to by Pedroso & Hernandes (2016) as “ Metagabucinia sp.”

Etymology. The species is named after the species name of the host, as a noun in apposition.

Figures

FIGURE 16. Proaposolenidia plumbea sp. nov., male: dorsal (A) and ventral (B) views.

FIGURE 17. Proaposolenidia plumbea sp. nov., female: dorsal (A) and ventral (B) views.

FIGURE 18. Proaposolenidia plumbea sp. nov.: genu, tibia and tarsus I–IV of male (A–D), tarsus IV of female (E), dorsal opisthosoma of male (F), spermatheca of female (G).