Nycteridocaulus sulcatus, Mironov & Galloway, 2020

Mironov, Sergey V. & Galloway, Terry D., 2020, Two new feather mites of the subfamily Proctophyllodinae (Acariformes: Proctophyllodidae) from the Yellow-bellied Flycatcher Empidonax flaviventris (Passeriformes: Tyrannidae) in Canada, Acarologia 60 (4), pp. 878-891 : 880-885

Nycteridocaulus sulcatus sp. n.

Zoobank: 33E79AC0-047C-41F5-9610-7B62F20718F8

Figures 1–3

Type material — Male holotype, 7 males, 12 females from Empidonax flaviventris ( Passeriformes , Tyrannidae ), (YBFL/430/CEN/09), (SM 2000), CANADA, Manitoba, Winnipeg, 5

June 2009, coll. T.D Galloway and J.A. McLeod.

Additional material — 4 males, 5 females from E. flaviventris , (OHM b854­14) (SM

2601), CANADA, Manitoba, High Bluff, 31 August 2014, coll. T.D Galloway and E.N. McNally.

Depository — Holotype, 2 male and 4 female paratypes — CNC, remaining paratypes — UMMZ, WRME and ZISP.

Description — Male (holotype, range for 7 paratypes in parentheses) ( Figures 1 , 3 A­D, G). Idiosoma, length × width, 290 (275–285) × 160 (150–165), length of hysterosoma 185 (180– 190). Prodorsal shield: anterolateral extensions with acute tips, lateral margins entire, posterior margin slightly concave, posterior corners almost rectangular, 82 (80–88) in length, 105 (100– 105) in width, posterior part with minute sparsely disposed lacunae. Setae ve rudimentary. Scapular setae se separated by 60 (57–63). Setae c2 and cp on humeral shields. Setae c3 lanceolate, 13 (13–15) long, about 5 wide. Distance between prodorsal and hysteronotal shields 25 (20–25). Hysteronotal shield: 185 (175–185) in length and 105 (95–100) in width; anterior margin slightly concave, surface with sparsely disposed, small, circular lacunae. Opisthosoma slightly attenuate posteriorly. Opisthosomal lobes short, roughly rectangular, posterior margin almost straight; terminal lamellae short rectangular, 10 (10–13) in length and 18 (16–18) in width. Terminal cleft small triangular, with anterior end extending to level of setae h2, length from anterior end to margins of lobes 15 (13–15), width at level of setae ps1 6 (6–8). Supranal concavity long, parallel­sided, with strongly sclerotized margins, open posteriorly, 58 (52–58) long. Setae h2 situated on truncate lateral extensions of opisthosomal lobes; setae h3 situated in posterolateral angles of lobes; setae ps 1 in posteromedial angles of lobes, slightly posterior to level of setae h3 ; setae h1 situated slightly posterior to setae ps2. Distance between dorsal setae: c2:d2 60 (55–60), d2:e2 65 (62–68), e2:h3 60 (52–60), h2:h2 60 (57–63), h3:h3 50 (47–53), ps2:ps2 67 (65–70), h1:h3 30 (27–30), d1:d220 (18–22), e1: e2 25 (23–28).

Epimerites I free, close to each other, posterior tips divergent; epimerites I, II with narrow surface fields; epimerites IVa absent. Rudimentary sclerite rEpIIa barely distinct. Trochanters III flanked by sclerotized bands going from bases of epimerites IIIa. Epimerites IIIa with sclerotized areas around their inner tips with acute extensions directed anteromediad. Trochanters IV flanked by sclerotized bands stretching from bases of epimerites IV. Genital apparatus situated at level of trochanters IV. Genital arch shaped as recurved bow, 8 (7–8) in length and 45 (45–48) in width. Aedeagus stylet­like, 17 (17–18) in length, reaching level of setae g ( Figure 3G ). Genital papillae of each side on small oval plates at level of genital arch apex. Distance from genital arch apex to level of setae h3 105 (100–105). Pregenital apodemes shaped as longitudinal sclerites of irregular form. Setae 4a on pregenital apodemes, setae 4b

on sclerotized areas of epimerites IIIa. Adanal suckers 15 (14–15) in diameter, corolla with 11–12 denticles. Adanal shields represented by a pair of roughly L­shaped sclerites situated anterior to anal suckers and touching at midline, length of shields 25 (23–25), distance between their lateral margins 48 (44–48). Setae ps3 situated on transverse branches of adanal shields. Opisthoventral shields shaped as small, roughly triangular extensions at level of adanal suckers. Distance between ventral setae: 3a:4b 7 (5–8), 4b:4a 27 (23–27), 4a:g 35 (32–35), g:g 20

(19–21), g:ps325 (23–25), ps3:ps3 27 (23–28), ps3:h3 65 (58–65).

Femora I, II with ventral crest. Solenidion σ of genu I approximately 1.5 times longer than this segment and situated at its midlevel ( Figure 3A ). Solenidion σ of genu III situated at midlevel of this segment. Legs III, IV subequal in size, legs IV with ambulacral discs extending beyond posterior margin of terminal lamellae. Tarsus IV 25 (22–25) in length, with longitudinal dorsal ridge and with triangular ventral process bearing w setamodified ; setae d and e button­like, setae d situated at midlength of segment ( Figure 3D ). Setae d and f of tarsi

II, III longer, subequal in length. Length of solenidia: σ I 35 (35–40), σ III 20 (20–25), φ IV 25 (25–30).

Female (range for 10 paratypes) ( Figures 2 , 3E, F ). Idiosoma, length × width, 365–385

× 165–180, length of hysterosoma 250–270. Prodorsal shield: generally shaped as in male, posterior corners pointed, 90–95 in length and 120–125 in width, surface with sparsely disposed minute circular lacunae. Setae se separated by 75–78. Setae c2 and cp on humeral shields.

Setae c3 lanceolate, 15–18 long, about 5 wide. Distance between prodorsal and hysteronotal shields 25–32. Anterior hysteronotal shield: 185–190 in length and 110–115 in width, anterior margin slightly concave, posterior margin with small truncate median extension and a pair of shallow concavities, median area of posterior half with sparsely disposed small circular lacunae ( Fig. 2A ). Lobar region: 72–75 in length and 100–105 in width, lateral margins strongly convex, without noticeable extensions bearing setae h2 ; lobar shield entire, with pair of narrow incisions in anterior margin and with small roughly rectangular extension between them. Terminal cleft narrow, almost parallel­sided, 50–55 in length, 18–22 in width in anterior part. Supranal concavity absent. Setae h2 lanceolate in basal part and with long filiform apex, 110–120 in length, 6–8 in width; setae h3 70– 60 in length, approximately 3/4 the length of terminal appendages. Setae h1 inserted on striated tegument between anterior hysteronotal and lobar shields. Setae h1 and f 2 in trapezoidal arrangement. Setae ps1 on inner margins of opisthosomal lobes, close to level of setae h3. Distance between dorsal setae: c2:d2 78–82,

d2:e2 95–105, e2:h2 35–40, h2:h3 32–35, h1:h2 35–37, d1:d2 25–28, e1: e2 45–50, h1:h1

25–33, h2:h2 80–84, h2:ps1 22–30.

Epimerites I as in male; epimerites I, II with narrow surface fields. Epimerites IVa large, roughly triangular, with heavily sclerotized margins. Epigynum horseshoe­shaped, thick, lateral margins without extensions, tips acute, not extending to level of setae g, 40–45 in length, 55–67

in width. Genital papillae of each side on small, ovate sclerotized plate. Setae ps2 situated at midlevel of anal opening. Translobar apodemes not fused to each other anterior to terminal cleft. Copulatory opening situated on anterior end of terminal cleft. Head of spermatheca short; proximal part of primary spermaduct with ampuliform enlargement 20–25 long ( Figure 3F ). Distance between pseudanal setae: ps2:ps2 43–45, ps3:ps3 19–21, ps2:ps3 13–15.

Legs I, II as male. Legs IV with ambulacral disc extending beyond level of setae h2. Solenidion σ of genu I about 1.5 times longer than this segment and situated at its midlevel. Solenidion σ of genu III in proximal half of this segment. Solenidion φ of tibia IV equal to corresponding tarsus ( Figure 3E ). Setae d, f of tarsi II–IV subequal in length. Length of solenidia: σ I 35–40, σ III 23–25, φ III 50–55, φ IV 30–35.

Differential diagnosis — The new species, Nycteridocaulus sulcatus sp. n., is close to N. guaratubensis Hernandes, 2014 from the Restinga Tyrannulet, Phylloscartes kronei

Willis & Oniki (Tyrannides: Tyrannidae ), in having minute lacunae on the hysteronotal shield in both sexes, short and truncate opisthosomal lobes with nearly rectangular terminal lamellae and the adanal shields roughly L­shaped in males, and the primary spermaduct with ampuliform enlargement in females. Nycteridocaulus sulcatus differs from N. guaratubensis in the following features: in males, the supranal concavity is parallel­sided and open posteriorly, pregenital apodemes are present, and tarsus IV has a longitudinal dorsal ridge ( Figures 1A , 3G ); in females, the posterior half of the hysteronotal shield bears sparsely disposed small circular lacunae ( Figure 2A ), and setae h3 are 75–85 long, about 3/4 the length of the terminal appendages. In males of N. guaratubensis , the supranal concavity is closed posteriorly and shaped as a long teardrop, pregenital apodemes are absent, and tarsus IV does not have a dorsal ridge; in females, the entire surface of the hysteronotal shield bears small circular lacunae and the posterior part has a pair of longitudinal rows consisting of 3 to 4 large ovate lacunae, and setae h3 are 66–72 long, about 1/2 the length of terminal appendages.

Etymology — The specific epithet sulcatus (from sulcus, groove, L.) is an adjective referring to the distinct groove­like supranal concavity in males.

Figures

Figure 1 Nycteridocaulus sulcatussp. n., male: A – dorsal view, B – ventral view.

Figure 2 Nycteridocaulus sulcatussp. n., female: A – dorsal view, B – ventral view.

Figure 3 Nycteridocaulus sulcatussp. n., details: A–C – legs I–III of male, respectively, D – tibia and tarsus IV of male, E – tibia and tarsus IV of female, F – spermatheca and spermaducts, G – opisthosoma of male, ventral view. Abbreviations: ad– adanal shield, ga– genital arch, hs– head of spermatheca, pd– primary spermaduct, pg – pregenital apodemes, sd – secondary spermaducts, tl– terminal lamella.