Platyacarus, Kudon, 1982

Mironov, Sergey V., Literak, Ivan, Sychra, Oldrich & Capek, Miroslav, 2017, Feather mites of the subfamily Proctophyllodinae (Acari: Proctophyllodidae) from passerines (Aves: Passeriformes) in Costa Rica, Zootaxa 4297 (1), pp. 1-105 : 8-9

Key to Platyacarus species (Males and females)

1. In both sexes, hysterosomal setae f2 present ( minor group).....................................................2

- In both sexes, hysterosomal setae f2 absent.................................................................3

2. In male, terminal lamellae close to each other with inner margins separated by 5 µm, epimerites IVa present ( Fig. 10 A, B). In female, bases of trochanters III, IV flanked by sclerotized bands, terminal cleft 2.1–2.7 times longer than wide at midlength, prodorsal shield without lacunae ( Fig. 11 A, B)......................................... P. sclerurus Mironov sp. n.

- In male, terminal lamellae well separated, distance between inner margins about 15 µm, epimerites IVa absent. In female, bases of trochanters III, IV not flanked by sclerotized bands, terminal cleft narrow, about 5 times longer than wide at midlength, prodorsal shield with minute circular lacunae......................................... P. minor (Berla, 1959)

3. In male, terminal lamellae strongly elongated, exceeding 60 µm, aedeagus extending beyond midlength of terminal lamellae, anal field flanked laterally by large bow-shaped adanal apodemes ( Fig. 13 A, B). In female, distal half of primary spermaduct strongly enlarged ( Fig. 15 E) ( caulifer group)............................................ P. caulifer Mironov sp. n.

- In male, terminal lamellae tongue-shaped, triangular or spiculiform, shorter than 30 µm, aedeagus not extending to anterior end of terminal cleft, anal field not flanked laterally by adanal apodemes. In female, primary spermaduct enlarged only at copulatory opening.......................................................................................4

4. In male, corolla of adanal suckers smooth, only postero-mesal fragments of adanal shields bearing setae ps3 present. In both sexes, setae c3 filiform or bristle-shaped, not thicker than 1 µm ( psilocoronius group)............................... 5

- In male, corolla of adanal suckers indented, two pairs of adanal shield fragments present (except P. epacrophyllicus having only postero-mesal pair). In both sexes, setae c3 lanceolate and 2–3 µm in width...................................8

5. In male, genital papillae connected at bases, genital organ 35-40 µm, terminal cleft semiovate or semicircular, incision outlined by interlobar membrane longer than wide. In female, setae h2 80–90 µm long......................................6

- In male, genital papillae separated, genital organ about 30 long, anterior margin of terminal cleft straight, incision outlined by interlobar membrane wider than long. In female, setae h2 about 65 µm long.................... P. diversus Kudon, 1982

6. In male, terminal cleft semicircular, incision outlined by free margin of interlobar membrane slightly longer than wide ( Fig. 7 A, B). In female, setae h1 moved backward from anterior edge of lobar shield, secondary spermaducts 2–3 µm long ( Fig. 8 A, B).................................................................................... P. picumnus sp. n.

- In male, terminal cleft ovate, incision outlined by interlobar membrane and terminal lamellae nearly 2 times longer than wide. In female, setae h1 on anterior edge of lobar shield, secondary spermaduct 5–10 µm long............................ 7

7. In male, genital organ about 40 µm and almost extending to level of setae ps3, terminal lamellae with acute apices, setae c2 on humeral shields, paragenital apodemes as teardrop-shaped longitudinal sclerites. (Female unknown)................................................................................................... P. longicolicus Kudon, 1982

- In male, genital organ about 36 µm and extending ¾ the distance between setae g and ps3, tips of terminal lamellae rounded, paragenital apodemes as small roughly ovate sclerites, setae c2 usually off humeral shields. In female, setae h1 on anterior edge of lobar shield, distance between their bases c. 52 µm.............................. P. psilocoronius Kudon, 1982

8. In male, terminal lamellae tongue-shaped, slightly longer than wide and rounded apically ( oligolaccius group)............9

- In male, terminal lamellae triangular, spiculiform or as a pair of very short convexities..............................13

9. In male, ratio of idiosoma length/width 1.6–2.0, entire surface of hysteronotal shield with distinct minute lacunae. In female, opisthosomal lobes short, with length approximately equal to width at base; terminal cleft equal or slightly longer than wide at midlevel; posterior part of hysteronotal shield abruptly widened in posterior one third.............................. 10

- In male, ratio of idiosoma length/width 2.2–2.5, surface of hysteronotal shield without distinct lacunae or with a few lacunae in postero-lateral part. In female, opisthosomal lobes elongated, 1.7–2 times longer than wide; terminal cleft narrow, 2.0–3.5 times longer than wide at midlevel; hysteronotal shield gradually widened toward posterior end...................... 11

10. In male, paragenital apodemes present, lacunae usually restricted to hysteronotal shield, terminal cleft half as wide as terminal lamellae, length of genital organ about 40 µm. In female, length of idiosoma c. 430 µm, width of lobar region c. 105 µm................................................................................ P. dontocoronius Kudon, 1982

- In male, paragenital apodemes absent, lacunae usually present on prodorsal and hysteronotal shields, width of terminal cleft approximately equal to that of terminal lamellae, length of genital organ about 50 µm. In female, length of idiosoma c. 470 µm, width of lobar region c. 120 µm.................................................... P. oligolaccius Kudon, 1982

11. In male, antero-lateral pieces of adanal shield bow-shaped, paragenital apodemes absent. In female, median extension and posterior angles of prodorsal shield approximately at same transverse level, anterior hysteronotal shield usually bears small circular lacunae................................................................ P. sittasomi Hernandes et al., 2007

- In male, antero-lateral pieces of adanal shield ovate or reniform, thin paragenital apodemes represented by thin longitudinal sclerites. In female, median extension of prodorsal shield extending distinctly beyond level of posterior angles of this shield, minute circular lacunae on hysteronotal shield absent or barely distinct..........................................12

12. In male, genital organ 14–18 µm long, not extending to level of setae g ( Fig. 6 A). In female, terminal cleft 85–90 µm long ( Fig. 5 A)................................................................................ P. dendrocolapti sp. n.

- In male, genital organ 40–45 µm long, almost extending to anterior end of anal opening ( Fig. 2 A). In female, terminal cleft 6 0– 65 µm long ( Fig. 2 A).................................................................. P. dendrocinclae sp. n.

13. In males, genital organ less than 41 µm long and extending approximately to midlevel between setae g and ps3 ( acaenophyllicus group)..........................................................................................14

- In male, genital organ longer than 44 µm and usually extending to level of setae ps3 ( epacrophyllicus group)............17

14. In both sexes, setae cG, mG of genu I spiculiform. In males, epimerites I fused into a Y, terminal lamellae as small semi-round convexities, setae h1 inserted on lateral edges of hysteronotal shield. In female, hysteronotal shield not split into anterior hys-

teronotal and lobar parts............................................................ P. trigonicus Kudon, 1982 - In both sexes, setae cG, mG of genu I setiform. In males, epimerites I fused into a narrow U, setae h1 inserted distinctly mesal from lateral edges of hysteronotal shield. In female, lobar shield is completely separated from anterior hysteronotal shield...................................................................................................... 15

15. In male, lamellae narrow, almost spiculiform; length of genual solenidion σ 1 I c. 15 µm. In female, width of lobar region over 100 µm, length of genual solenidion σ 1 I c. 19 µm................................... P. acaenophyllicus Kudon, 1982

- In male, lamellae triangular, length of genual solenidion σ 1 I c. 10 µm. In female, width of lobar region 85–95, length of genual solenidion σ 1 I 12–14 µm...............................................................................16

16. In male, genital papillae free, setae g and ps3 arranged in inverted trapezium, length of genital organ c. 40 µm, adanal suckers with 12 denticles. In female, width of lobar region about 95 µm, proximal 1/3rd of primary spermaduct gradually expanding toward the head of spermatheca................................................... P. leptodonticus Kudon, 1982

- In male, genital papillae fused, setae g and ps3 arranged in rectangle, length of genital organ about 35 µm, adanal suckers with 10 denticles. In female, width of lobar region about 85 µm, primary spermaduct abruptly expanding in proximal 1/5th.................................................................................... P. brevicolicus Kudon, 1982

17. In male, antero-lateral pieces of adanal shields absent, setae h1 inserted approximately 1/5th the distance from lateral edge to midline of hysterosomal shield. In female, setae h1 inserted on soft tegument between anterior hysteronotal and lobar shields........................................................................... P. epacrophyllicus Kudon, 1982

- In male, antero-lateral pieces of adanal shields present, setae h1 inserted approximately 1/2 the distance from lateral edge to midline of hysterosomal shield. In female, setae h1 inserted on anterior edge of lobar shields......................... 18

18. In male, genital papillae free, setae g and ps 3 in narrow trapezoid arrangement, length of idiosoma excluding lamellae c. 360 µm. In female, opisthosomal lobes slightly longer than wide at base, width of terminal cleft c. 25 µm. In both sexes, prodorsal shield completely divided into anterior and posterior parts............................. P. lepidophagicus Kudon, 1982

- In male, genital papillae connected at base, setae g and ps 3 in rectangular arrangement, length of idiosoma excluding lamellae c. 300 µm. In female, opisthosomal lobes narrow, 2 times longer than wide at base, width of terminal cleft c. 45 µm. In both sexes, prodorsal shield incompletely divided............................................... P. major Kudon, 1982

Figures

FIGURE 2. Platyacarus dendrocinclae Mironov sp. n., female. A—dorsal view, B—ventral view.

FIGURE 5. Platyacarus dendrocolapti Mironov sp. n., female. A—dorsal view, B—ventral view.

FIGURE 6. Platyacarus dendrocolapti Mironov sp. n., details. A—opisthosoma of male, ventral view, B, C—legs I and II of male, dorsal view, D—tibia and tarsus IV of male, dorsal view, E – spermatheca and spermaducts.

FIGURE 7. Platyacarus picumnus Mironov sp. n., male. A—dorsal view, B—ventral view.

FIGURE 8. Platyacarus picumnus Mironov sp. n., female. A—dorsal view, B—ventral view.

FIGURE 10. Platyacarus sclerurus Mironov sp. n., male. A—dorsal view, B—ventral view.

FIGURE 11. Platyacarus sclerurus Mironov sp. n., female. A—dorsal view, B—ventral view.

FIGURE 13. Platyacarus caulifer Mironov sp. n., male. A—dorsal view, B—ventral view.

FIGURE 15. Platyacarus caulifer Mironov sp. n., details. A—opisthosoma of male, ventral view, B, C—legs I and II of male, dorsal view, D—tibia and tarsus IV of male, dorsal view, E— – spermatheca and spermaducts.