Aetacarus accipiter, 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 : 37-41

Aetacarus accipiter sp. nov.

( Figs. 25–27 )

Type material. Holotype male (#4975), paratypes 14 males, 17 females, and 4 nymphs (#4976–5003) ex Accipiter bicolor (Vieillot, 1817) ( Accipitriformes : Accipitridae ), specimen found dead after collision with glass panel, BRA- ZIL, State Park Intervales, Ribeirão Grande, SP, June, 2017, no further data. This species was found on the same host specimen on which Proaposolenidia bicolor sp. nov. was collected .

Depositories: Holotype and paratypes at UFSC.

MALE ( Figs. 25 , 27 A–D, F). (Holotype, range for five paratypes in parentheses). Gnathosoma roughly trapezoidal, length including palps 71 (65–71), greatest width at base 70 (67–75). Idiosoma length from anterior end to bases of setae h3 on lobar apices 466 (444–483), greatest width at level of humeral setae 226 (202–241); length of hysterosoma 336 (320–355). 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 with shallow concavities at level of scapular setae, posterior margin slightly sinuous, greatest length 106 (100–109), width at posterior margin 117 (115–123). Setae vi spiculiform, 52 (40–52) long, extending to midlength of palps. Setae si spiculiform, 32 (30–35) long. Distance between bases of scapular setae: se: se 65 (64–68), si: si 27 (27–32). Subhumeral setae c3 lanceolate with apical filament, length × width 32 (30–35) × 6 (5–6). Hysteronotal shield: greatest length from anterior margins to bases of setae h3 323 (312–344), length along midline 199 (185–199), width at anterior margin 184 (179–205), anterior margin straight, surface mostly with faint reticulate ornamentation, and a few longitudinal striations medially. Lateral bands distinct. Lobar areas of hysteronotal shield not separated from main body of hysteronotal shield. Supranal concavity indistinct. Setae c2 spiculiform, 26 (25–28) long, situated in anterior angles of hysteronotal shield, cupules ia immediately postero-mesal to their bases. Setae e1 situated slightly posterior to level of hysteronotal gland openings gl. Terminal cleft roughly trapezoidal, with divergent opisthosomal lobes, length from anterior end to lobar apices (bases of setae h3) 87 (86–97), width at level of setae h1 98 (90–102). Inner margin of opisthosomal lobes heavily sclerotized, with a shallow concavity anterior to setae h1, posterior ends of opisthosomal lobes with small rounded extensions. Setae e2 thick spiculiform 40 (40–46) long, with apices extending slightly beyond level of setae h2 bases; setae f2 narrowly lanceolate, 23 (22–28) long, situated posterior to level of setae h2, setae h1 narrowly lanceolate, 20 (19–22) long, 4 (4–5) wide, situated only slightly posterior to level of setae h2. Distances between bases of dorsal setae and gland openings: c2: d2 103 (99–106), d2: e2 164 (164–174), e2: h3 51 (51–61), d2: gl 58 (58–66), h3: h3 131 (124–138), h2: h2 132 (125–138), d1: d2 29 (29–35), e1: e2 92 (92–101).

Epimerites I, II without inflated bases. Epimerites I with tips simple, almost extending to bases of coxal setae 1a. Epimerites II almost straight. Genital apparatus situated posteriorly near the anterior level of anal opening, genital arch 25 (22–29) × 17 (17–19), aedeagus not extending to its base. Bases of setae 4a separated. Setae 4b slightly posterior to level of setae 3a. Setae g much anterior to genital papillae, close to level of setae 4b. Distances between ventral setae: 4b: g 10 (6–12), g: 4a 117 (111–120), 4a: ps3 33 (30–37), ps3: ps3 101 (101–113), 4a: 4a 12 (11–14). Adanal suckers 24 (22–25) in diameter, corolla with 14–15 rounded denticles.

Femora I, II without ventral crest. Seta cG of genu I spiculiform, 78 (70–78) long, slightly longer than combined length of genu and tibia. Solenidion σ 1 of genu I 13 (13–16) long, 2–3 times longer than solenidion σ 2. Solenidion σ of genu III situated in basal part of this segment. Solenidion φ of tibia IV shorter than corresponding tarsus. Tarsus IV with seta d minute spine-like, seta e setiform. Legs IV with ambulacrum extending to the level of lobar apices. Length of tarsi: I 54 (54–58), II 65 (65–74), III 70 (70–75), IV 73 (71–77). Ambulacral disc of tarsus I slightly larger than those of tarsi II–IV. Length of solenidia: σ1 I 13 (13–16), σ II 5 (5–7), σ III 12 (9–12), ω1 I 12 (10–13), ω1 II 22 (19–24).

FEMALE ( Figs. 26 , 27E, G ) (range for five paratypes). Gnathosoma, length × width, 83–91 × 88–94. Idiosoma, length × width, 536–573 × 260–298, length of hysterosoma 399–420. Prodorsal shield shaped as in male, 123–128 × 134–146. Setae vi setiform, 48–58 long, reaching basal part of palps. Setae si spiculiform, 34–41 long. Distance between bases of scapular setae: se: se 82–86, si: si 36–41. Subhumeral setae c3 lanceolate with apical filament, length × width 35–43 × 6–7. Hysteronotal shield completely separated into main body and a pair of narrow opisthosomal plates by large U-shaped unsclerotized area opened posteriorly. Main body of hysteronotal shield: anterior margin concave; anterior angles acute; posterior end wide, slightly convex, not extending to level of setae e2 and h1, greatest length 292–318, width at anterior margin 226–250, surface with faint reticulate striation mostly transversal in the anterior 2/3, and longitudinal in the posterior third. Lateral bands well developed, anterior ends tightly adjacent to main body of hysteronotal shield, posterior ends fused with opisthosomal pieces. Postero-lateral margins of opisthosomal pieces and lateral bands heavily sclerotized. Posterior end of opisthosoma almost semi-rounded. Setae c2 spiculiform, 31–36 long, situated on hysteronotal shield; cupules ia postero-mesal to them. Setae d2 short piliform, 20–22 long. Setae e1 posterior to level of hysteronotal gland openings gl. Posterior and lateral margins of opisthosoma heavily sclerotized, bearing setae e2, f2, h2, h3, and ps1. Setae e2 lanceolate with round apex, length × width 30–37 × 7–10, setae f2 piliform 19–39 long, setae h1 minute spine-like stout spiculiform, 4–6 long, situated on unsclerotized area of opisthosoma. Distances between dorsal setae and gland openings: c2: d2 107–120, d2: e2 212–227, e2: h3 43–60, d2: gl 80–84, h1: h1 62–69, h2: h2 72–82, h3: h3 47–55.

Epimerites I, II without inflated bases. Epimerites I not extending to setae 1a. Epigynum horseshoe-shaped, 72– 80 long, 71–87 wide. Setae 4b situated on branches of epigynum, approximately at its midlength. Setae 4a situated far posterior to genital papillae. Copulatory opening terminal, situated on minute cone-like extension immediately posterior to anal opening. Distances between ventral setae: 4b: g 48–56, 4b: 3a 29–33, g: 4a 88–101, ps2: ps3 28–38, ps2: ps2 74–84.

Femora I, II without ventral crest. Setae cG of genu I long spiculiform, 79–91 long, approximately subequal to combined length of genu and tibia I. Legs IV with distal part of tarsus and ambulacra extending beyond posterior end of opisthosoma. Length of tarsi: I 66–72, II 81–88, III 87–97, IV 96–108. Length of solenidia: σ1 I 17–23, σ II 9–13, σ III 12–14, ω1 I 13–15, ω1 II 24–29.

Differential diagnosis. Aetacarus accipiter sp. nov. resembles A. andrei in having, in males, the inner margins of the opisthosomal lobes oblique with shallow rounded incisions anterior to setae h1, the lateral margins of prodorsal shield straight, and setae g situated only slightly posterior to 4b. Aetacarus accipiter can be distinguished from A. andrei by the following features: in both sexes, prodorsal setae si long and reaching the posterior border of the prodorsal shield; in males, setae e2 are relatively long and surpass the bases of h2; and in females, lateral margins of prodorsal shield are without deep incisions at the level of scapular setae se. In both sexes of A. andrei , setae si are very short and thin, reaching only halfway to the posterior border of the prodorsal shield; in males of that species, setae e2 reach only about ¾ of the distance between its bases and that of h2, and in females, the prodorsal shield has deep lateral incisions towards setae se.

Etymology. The species epithet is taken from the generic name of the type host, and is a noun in apposition.

Figures

FIGURE 25. Aetacarus accipiter sp. nov., male: dorsal (A) and ventral (B) views.

FIGURE 26. Aetacarus accipiter sp. nov., female: dorsal (A) and ventral (B) views.

FIGURE 27. Aetacarus accipiter 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).