Sperchon tridentatus, Sokolow, 1940

Tuzovskij, Petr V., 2021, Two new water mite species of the Sperchon tridentatus-group from Asia (Acari Hydrachnidia, Sperchontidae), Zootaxa 4970 (1), pp. 143-150 : 150

Key to species of the Sperchon tridentatus -group

1 Integument without muscle attachment sclerites............................................................. 2

- Integument with muscle attachment sclerites............................................................... 3

2 P-4 shorter than P-3, P-2 distoventral projection bearing three fine setae, P-3 ventral margin straight ( Fig. 22 ), claw lamella with straight ventral margin ( Fig. 23 ), excretory pore unsclerotized ( Sokolow 1940).......................... S. tridentatus

- P-4 longer than P-3, P-2 with thick seta near base of distoventral projection which bearing two fine setae ( Fig. 19 ), P-3 ventral margin convex, claw lamella with concave ventral margin ( Fig. 21 ), excretory pore sclerotized ( Fig. 16 )...... S. smiti sp.n.

3 All dorsocentral sclerites free and sclerotized ( Fig. 1 ), P-2 with rather long ventrodistal projection bearing two fine setae ( Fig. 7 ), all genital acetabula subequal in size and distinctly separated ( Fig. 3 ), excretory pore ( Fig. 2 ) unsclerotized.................................................................................................... S. pesici sp. n.

- Dorsocentral sclerites dc.1 and dc.2 unsclerotized, dc.3 fused with glandulartia Sci ( Fig. 24 ), P-2 distoventral projecting short and without fine setae, with single thick seta near base of projection ( Fig. 26 ), ac.2 larger than ac.1 and ac.3, all acetabula slightly separated, excretory pore ( Fig. 25 ) sclerotized ( Tuzovskij 2003)................................... S. minor

Figures

FIGURES 22–26. Sperchon, adults: S. tridentatus: 22, pedipalp; 23, leg claw (after Sokolow 1940); S. minor: 24, idiosoma, dorsal view; 25, idiosoma, ventral view; 26, pedipalp (after Tuzovsky 2003).

FIGURES 19–21. Sperchon (Sperchon) smiti sp. n., male: 19, pedipalp; 20, IV-Leg-3–6; 21, leg claw. Scale bar: 1, 2, 3–5, 6 = 50 μm, 7, 8 = 20 μm

FIGURES 10–18. Sperchon (Sperchon) smiti sp. n., male: 10, fragment of integument; 11, seta Fch; 12, idiocomal seta associated with glandularia; 13, trichobothria Oi; 14, coxal plates, left side; 15, genital field; 16, excretory pore; 17, capitulum, lateral view; 18, chelicera. Scale bars: 10–13, 16 = 50 μm, 14–15, 17–18 = 100 μm.

FIGURES 1–2. Sperchon (Sperchon) pesici sp. n., male: 1, idiosoma dorsal view; 2, idiosoma ventral view. Scale bar: 200 μm.

FIGURES 3–9. Sperchon (Sperchon) pesici sp. n., male: 3, genital plate; 4, ejaculatory complex; 5, capitulum, lateral view; 6, chelicera, lateral view; 7, pedipalp; 8, IV-Leg-3–6; 9, leg claw. Scale bars: 3, 5–7 = 100 μm, 4 = 200 μm, 9 =50 μm.