Piciformobia adjuncta, 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 : 12-16

Piciformobia adjuncta sp. nov.

( Figs. 7 , 8 A–C, 9A–G)

Type material: Male holotype (#4748), paratypes (#4749–4794) 19 males and 27 females ex Guira guira (Gmelin, 1788) ( Cuculiformes : Cuculidae ), roadkilled specimen, BRAZIL, Rio Grande do Sul State, Pelotas, 31°46ʹ S, 52°20ʹ W, 30 October 2006, F.M. Lambrecht col.; paratypes 2 males, same host species, roadkilled specimen, Minas Gerais State, Lavras, 21°13ʹ S, 44°58ʹ W, 26 February 2014, L.F.O. Bernardi col.; paratypes 1 male and 1 female, São Paulo State, Amparo, 22°42ʹS, 46°45ʹ W, 10 March 2007, D.V. Boas-Filho col.; paratypes 3 females, same host species, São Paulo State, Campinas, 22°49ʹ S, 47°04ʹ W, September 2010, D.V. Boas-Filho col. (#828).

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

MALE ( Figs. 7 , 9 A–D, G). (Holotype, range for five paratypes in parentheses). Gnathosoma roughly trapezoidal, length including palps 70 (62–66), greatest width at base 71 (64–71). Idiosoma length from anterior end to bases of setae h3 on lobar apices 473 (460–484), greatest width at level of humeral setae 237 (216–238); length of hysterosoma 354 (337–358). Prodorsal shield: antero-lateral extensions protruding to margins of propodosoma between trochanters I and II, not fused with epimerites Ia, antero-lateral margins heavily sclerotized, lateral margins with shallow concavities at level of scapular setae se, posterior margin sinuous, greatest length 110 (104–117), width at posterior margin 133 (129–136). Setae vi piliform, 34 (32–40) long, extending to midlength of palps. Setae si piliform, 14 (12–18) long. Distance between bases of scapular setae: se: se 75 (72–78), si: si 32 (32–36). Subhumeral setae c3 lanceolate, length × width, 20 (19–22) × 6 (6–7). Hysteronotal shield: greatest length from anterior margins to bases of setae h3 341 (320–348), length along midline 198 (199–216), width at anterior margin 186 (179–193), anterior margin slightly concave, surface of anterior two thirds smooth, posterior third with small irregular lacunae. Lateral bands indistinct. Lobar areas of hysteronotal shield separated from main body of hysteronotal shield. Supranal concavity indistinct. Setae c2 thick lanceolate, 28 (25–29) long, situated on anterior angles of hysteronotal shield, cupules ia immediately posterior to their bases. Setae e1 situated at level of hysteronotal gland openings gl. Length of terminal cleft from anterior end to lobar apices (setae h3) 111 (98–116), width at level of setae h1 91 (82–91). Inner margin of terminal cleft heavily sclerotized, small incision immediately anterior to setae h1, posterior ends of opisthosomal lobes with small rounded extensions. Setae e2 thick lanceolate 42 (41–50) long, approximately half as long as distance from its base to setae h2; setae f2 narrowly lanceolate, 27 (28–35) long, situated slightly posterior to level of setae h2, setae h1 lanceolate, 29 (24–30) long, 5 (5–7) wide, situated slightly anterior to level of setae h2. Distances between bases of dorsal setae and gland openings: c2: d2 91 (85–92), d2: e2 140 (123–144), e2: h3 101 (94–105), d2: gl 77 (67–79), h3: h3 123 (116–125), h2: h2 123 (112–120), d1: d2 9 (10–21), e1: e2 68 (61–78).

Epimerites I, II without inflated bases. Epimerites I with tips simple, parallel, not extending to bases of coxal setae 1a. Epimerites II curved. Genital apparatus slightly posterior to level of trochanters IV, genital arch 26 (25–27) × 23 (19–23), aedeagus not extending to its base. Bases of setae 4a separated. Setae 4b approximately at the same level as setae 3a. Setae g far anterior to genital papillae. Adanal shields present, as two small but well-sclerotized C-shaped (“pac-man” shaped) sclerites anterior to anal opening. Distances between ventral setae: 4b: g 22 (20–26), g: 4a 86 (80–91), 4a: ps3 61 (56–65), ps3: ps3 109 (109–113), 4a: 4a 12 (8–12). Adanal suckers 24 (22–24) in diameter, corolla with 17–20 rounded denticles.

Femora I, II without ventral crest. Seta cG of genu I long spiculiform, 67 (60–70) long, exceeding combined length of genu and tibia. Solenidion σ 1 of genu I 15 (14–25) 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 as long as corresponding tarsus. Tarsus IV with setae d and e short spine-like. Legs IV with distal half of tarsus extending only slightly posterior to level of setae e2. Length of tarsi: I 37 (35–37), II 43 (39–47), III 44 (42–44), IV 46 (42–46). Ambulacral disc of tarsus I circular, only slightly larger than those of tarsi II–IV. Length of solenidia: σ1 I 15 (14–25), σ II 5 (4–6), σ III 8 (5–8), ω1 I 11 (8–11), ω1 II 12 (12–15).

FEMALE ( Figs. 8 , 9E, F ) (range for five paratypes). Gnathosoma, length × width, 82–98 × 92–99. Idiosoma, length × width, 576–625 × 279–303, length of hysterosoma 412–471. Prodorsal shield shaped as in male, 143–153 × 174–192. Setae vi piliform, 45–66 long, extending to midlength of palps. Setae si thin spiculiform, 19–27 long. Distance between bases of scapular setae: se: se 93–100, si: si 46–50. Subhumeral setae c3 lanceolate, length × width, 23–25 × 6–7. Hysteronotal shield almost completely separated by bow-shaped transverse unsclerotized area into main body and opisthosomal part. Main body of hysteronotal shield: anterior margin slightly concave and irregularly indented, anterior angles acute, posterior end with sinuous margin, extending slightly beyond level of setae e2, greatest length 299–347, width at anterior margin 229–261, anterior one third with median patch of minute irregular lacunae. Lateral bands well developed. Opisthosomal part of hysteronotal shield: postero-lateral margins strongly sclerotized, bearing setae h2, h3, ps1, e2 and f2. Posterior end of opisthosoma with pair of small lobes and shallow terminal cleft between them. Setae c2 thick lanceolate, 19–21 long, situated on anterior angles of hysteronotal shield; cupules ia posterior to them. Setae d2 short piliform, 13–17 long. Setae e1 slightly posterior to hysteronotal gland openings gl. Postero-lateral margins of opisthosoma well sclerotized. Setae e2 and f2 thick lanceolate, e2 length × width 29–34 × 8–9, f2 37–42 × 6–7, setae h1 short piliform, 8–13 long, situated on anterior margins of lobar part of hysteronotal shield. Distances between dorsal setae and gland openings: c2: d2 101–116, d2: e2 178–198, e2: h3 96–115, d2: gl 84–100, h1: h1 55–60, h2: h2 76–90, h3: h3 55–75.

Epimerites I, II without basal inflation. Epimerites I not extending to setae 1a. Epigynum horseshoe-shaped, 59–68 long, 73–93 wide. Setae 4b situated on epigynum, at midlevel of its branches. Setae 4a situated posterior to genital papillae. Copulatory opening terminal, posterior to anal opening. Distances between ventral setae: 4b: g 60–74, 4b: 3a 32–55, g: 4a 51–59, ps2: ps3 23–33, ps2: ps2 77–111.

Femora I, II without ventral crest. Setae cG of genu I long spiculiform, 75–88 long, as long as combined length of genu and tibia I. Legs IV with ambulacrum extending about to level of setae e2. Length of tarsi: I 47–55, II 53–61, III 55–59, IV 60–65. Length of solenidia: σ1 I 20–33, σ II 7–10, σ III 6–11, ω1 I 8–11, ω1 II 16–20.

Differential diagnosis. The new species Piciformobia adjuncta sp. nov. resembles P. guirae Alzuet et al., 1988 in having genual seta cG -I as long as or longer than genu I. In P. henicorhinae and P. cinnycerthiae this seta is about half the length of genu I. Piciformobia adjuncta sp. nov. can be distinguished from P. guirae by having setae cG -I much longer, about the length of genu and tibia of legs I combined. In males of the new species, the inner margins of the opisthosomal lobes have a narrow incision anterior to setae h1, and setae e2 and f2 are separated by a distance about twice the length of e2; in females, the posterior margin of hysteronotal shield is sinuous through its entire width at level of setae e2. In both sexes of P. guirae , setae cG -I are as long as genu I ( Fig. 9I ), the inner margins of the opisthosomal lobes of males have a rounded incision anterior to h1, setae e2 and f2 are separated by a distance about the same length of setae e2 ( Fig. 9H ), and the hysteronotal shield in females has a long median extension surrounded by two narrow concavities in the posterior margin.

Remarks. This mite is the second species of Piciformobia described from the Guira Cukoo. In addition to Piciformobia guirae and P. adjuncta sp. nov., several other feather mites also inhabit this host: Aniacarus simplex Mironov et al. , A. robustus Mironov et al. , A. coronatus Mironov et al. , Aniibius guirae Mironov et al. (Pterolichidae) ( Mironov et al. 2015), Allopsoroptoides galli Mironov (Psoroptoididae) ( Mironov 2013, Hernandes et al. 2014), Carcinopodacarus polymorphus Hernandes et al., 2015 ( Dermationidae ), and Ascouracarus sp. ( Ascouracaridae ) ( Pedroso & Hernandes 2016).

Etymology. From Latin adjuncta = adjacent, as this is the second Piciformobia species found on Guira guira , both collected together from the same host specimens.

Figures

FIGURE 7. Piciformobia adjuncta sp. nov., male: dorsal (A) and ventral (B) views.

FIGURE 8. Piciformobia adjuncta sp. nov., female: dorsal (A) and ventral (B) views, spermatheca (C); spermatheca of Piciformobia guirae Alzuet et al. (D).

FIGURE 9. Piciformobia adjuncta sp. nov.: legs I–IV of male (A–D), distal part of tibia and tarsus III–IV of female (E–F), dorsal opisthosoma of male P. adjuncta sp. nov. (G) and P. guirae Alzuet et al. (H), genu I of male P. guirae Alzuet et al. (I).