Hieracolichus caboclo, 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 : 29-33

Hieracolichus caboclo sp. nov.

( Figs. 19–21 )

Type material: Male holotype (#4897), paratypes 5 males, 6 females, and 6 nymphs (#4898–4914) ex Buteogallus meridionalis (Latham, 1790) ( Accipitriformes : Accipitridae ), roadkilled specimen, BRAZIL, São Paulo State, Mococa, 21°28ʹ S, 47°00ʹ W, November 2012, D.V. Boas-Filho col. (#1086) .

Depositories: Holotype and paratypes at UFSC.

MALE ( Figs. 19 , 21 A–E). (Holotype, range for five paratypes in parentheses). Gnathosoma roughly trapezoidal, length including palps 68 (66–68), greatest width at base 70 (65–74). Idiosoma length from anterior end to bases of setae h3 on lobar apices 459 (412–459), greatest width at level of humeral setae 235 (222–241); length of hysterosoma 330 (296–30). Prodorsal shield: antero-lateral extensions protruding to margins of propodosoma between trochanters I and II, separated from epimerites Ia, antero-lateral margins heavily sclerotized, lateral margins slightly sinuous at level of setae se, posterior margin with shallow median concavity, greatest length 96 (94–97), width at posterior margin 116 (109–132). Setae vi thin piliform, 32 (32–44) long, extending to midlength of subcapitulum. Setae si thin setiform, 38 (37–50) long. Distance between bases of scapular setae: se: se 67 (67–77), si: si 26 (22–30). Subhumeral setae c3 thin setiform, 47 (42–57) long. Hysteronotal shield: greatest length from anterior margins to bases of setae h3 299 (276–307), length along midline 185 (181–192), width at anterior margin 207 (188–217), anterior margin slightly concave, surface except lobes with reticulate ornamentation. Lateral bands distinct. Lobar areas of hysteronotal shield not separated from main body of hysteronotal shield. Supranal concavity small semicircular, opened posteriorly. Setae c2 spiculiform, 38 (35–39) long, situated in anterior angles of hysteronotal shield, cupules ia immediately postero-mesal to their bases. Setae e1 situated near lateral margins of hysteronotal shield, posterior to level of hysteronotal gland openings gl. Terminal cleft roughly trapezoidal, length from anterior end to lobar apices (bases of setae h3) 79 (70–88), width at level of setae h1 104 (89–113). Inner margin of opisthosomal lobes straight, posterior ends of opisthosomal lobes with small rounded membranous extensions. Setae e2 spiculiform 46 (43–52) long, with apices almost extending to level of setae h2; setae f2 narrowly lanceolate, 33 (23–35) long, situated at level of setae h2, setae h1 lanceolate with rounded apex, 39 (39–53) long, 5 (4–5) wide, situated slightly posterior to level of setae h2. Distances between bases of dorsal setae and gland openings: c2: d2 105 (91–105), d2: e2 136 (133–140), e2: h3 68 (68–73), d2: gl 53 (52–62), h3: h3 123 (113–130), h2: h2 132 (122–133), d1: d2 16 (10–20), e1: e2 57 (70–84).

Epimerites I, II without inflated bases. Epimerites I with tips simple, not extending to bases of coxal setae 1a. Epimerites II slightly curved. Genital apparatus at level of femora IV, genital arch 30 (26–30) × 27 (21–27), aedeagus not extending to its base. Bases of setae 4a separated, situated near posterior tips of genital arch. Setae 4b at the same level as setae 3a, or slightly posterior to it. Setae g at level of anterior pair of genital papillae. Distances between ventral setae: 4b: g 38 (36–45), g: 4a 77 (59–77), 4a: ps3 36 (30–38), ps3: ps3 116 (101–121), 4a: 4a 33 (27–35). Adanal suckers 24 (21–24) in diameter, corolla with 14–17 rounded denticles.

Femora I, II without ventral crest. Seta cG of genu I spiculiform, thin, almost filiform apically 45 (44–52) long, longer than this segment. Solenidion σ 1 of genu I 10 (8–13) long, about three times longer than solenidion σ 2. Solenidion σ of genu III situated at midlength of this segment. Solenidion φ of tibia IV slightly shorter than corresponding tarsus. Tarsus IV with seta d and e minute spiculiform. Legs IV with distal half of ambulacrum extending beyond level of lobar apices. Length of tarsi: I 57 (56–61), II 62 (61–67), III 60 (60–72), IV 66 (66–72). Ambulacral disc of tarsus I ovate and slightly longer than circular-shaped ambulacral discs of tarsi II–IV. Length of solenidia: σ1 I 10 (8–13), σ II 8 (6–9), σ III 12 (9–15), ω1 I 17 (15–22), ω1 II 23 (25–27).

FEMALE ( Figs. 20 , 21F, G ) (range for five paratypes). Gnathosoma, length × width, 78–82 × 81–85. Idiosoma, length × width, 469–545 × 215–272, length of hysterosoma 341–407. Prodorsal shield shaped as in male, 105–114 × 125–138. Setae vi thin piliform, 42–45 long, only reaching basal part of palps. Setae si thin setiform, 51–59 long. Distance between bases of scapular setae: se: se 76–85, si: si 29–40. Subhumeral setae c3 thin setiform, length × width 47–60 × 2. Hysteronotal shield almost completely separated into main body and a pair of narrow opisthosomal pieces by large, U-shaped desclerotized area opened terminally ( Fig. 20A ). Main body of hysteronotal shield: anterior margin almost straight, anterior angles acute, posterior end with two-stepped extension, slightly exceeding by its narrowest terminal part level of setae h1, greatest length 296–370, width at anterior margin 199–239, surface of median part with faint cellular ornamentation. Lateral bands well developed, with anterior ends extending beyond level of setae d1. Opisthosomal pieces of hysteronotal shield: postero-lateral margins strongly sclerotized, bearing setae e2, f2, h2, h3, and ps1. Posterior margin of opisthosoma semi-rounded. Setae c2 spiculiform, 44–59 long, situated on anterior angles of hysteronotal shield; cupules ia postero-mesal to them. Setae d2 short piliform, 18–25 long. Setae e1 approximately at level of hysteronotal gland openings gl. Setae e2 spiculiform, length × width 35–45 × 2; setae f2 thin piliform 18–38 long; setae h1 short piliform, 7–9 long, situated on unsclerotized areas of opisthosoma. Distances between dorsal setae and gland openings: c2: d2 104–121, d2: e2 169–202, e2: h3 39–73, d2: gl 63–84, h1: h1 75–86, h2: h2 56–80, h3: h3 28–38.

Epimerites I, II without basal inflation. Epimerites I not extending to setae 1a. Epigynum horseshoe-shaped, 41–70 long, 59–66 wide. Setae 4b situated on epigynum, approximately at midlength of its branches. Setae 4a situated posterior to genital papillae. Copulatory opening subterminal, immediately posterior to anal opening. Distances between ventral setae: 4b: g 39–48, 4b: 3a 17–23, g: 4a 30–38, ps2: ps3 25–32, ps2: ps2 61–81.

Femora I, II without ventral crests. Setae cG of genu I spiculiform, strongly narrowed apically, 48–58 long, 1.5 times longer than corresponding segment. Legs IV with distal part of tarsus extending beyond posterior end of opisthosoma. Length of tarsi: I 65–70, II 72–83, III 76–81, IV 85–90. Length of solenidia: σ1 I 14–17, σ II 8–11, σ III 12–15, ω1 I 21–25, ω1 II 29–32.

Differential diagnosis. Hieracolichus caboclo sp. nov. is similar to H. similis ( Gaud & Mouchet, 1959) in having genual setae cG on genua I thin, about 1.5× longer than the segment, and setae h1 longer than f 2 in males. Although H. nisi also has thin seta cG I, in that species h1 is shorter than f2. The new species differs from H. similis in having the following features: in both sexes, the prodorsal shield has shallow lateral concavities not extending to bases of setae se; in females, setae si surpass the posterior margin of the prodorsal shield by half of their length. In both sexes of H. similis , the prodorsal shield has two incisions around setae se, and in females, setae si reach only the posterior margin of the prodorsal shield.

Etymology. The specific epithet is derived from the Portuguese common name of the type host, “Gavião-caboclo”.

Figures

FIGURE 19. Hieracolichus caboclo sp. nov., male: dorsal (A) and ventral (B) views.

FIGURE 20. Hieracolichus caboclo sp. nov., female: dorsal (A) and ventral (B) views.

FIGURE 21. Hieracolichus caboclo sp. nov.: genu, tibia and tarsus I–IV of male (A–D), dorsal opisthosoma of male (E), tarsus IV (F) and spermatheca of female (G).