Lebertia (Pilolebertia) porosa Thor, 1900

Tuzovskij, Petr V., 2016, Larval morphology of Lebertia insignis Neuman, 1880, L. porosa Thor, 1900 and L. saxonica Thor, 1911 (Acari, Hydrachnidia: Lebertiidae), Zootaxa 4121 (3), pp. 295-310 : 300-303

Lebertia (Pilolebertia) porosa Thor, 1900

( Figs 13–25 )

Material examined. Larvae (n = 18) were reared from two females collected in the Ubin stream near the settlement Ubinskaya, Seversky District, Krasnodar Kray (North Caucasus): one female on 22 June 1976 and one female on 26 June 1976. The duration of the embryonic period was 10–13 days.

Diagnosis. Larva. Dorsal plate elongated (L/W ratio 1.65–1.75); excretory pore plate oval; P-4 short, L <H; urstigma relatively large (D 14–16 µm); I–III-Leg–5 comparatively short: 64–74, 74–80, 85–90 µm, respectively; III–Leg-5 without acanthoid seta. Adult. P-3 mediodistal seta halfway between ventrodistal seta and dorsodistal seta ( Fig. 25 ).

Redescription. Larva. Dorsal plate elongate (L/W ratio 1.65–1.75) ( Fig.13 ), its anterior margin slightly convex, posterior margin rounded. Nine pairs of long setae (Oe, Hi, He, Sci, Sce, Li, Le, Si, Se) situated in the soft, wrinkled membrane, setae Si and Se slightly shorter than Oe, Hi, He, Sci, Sce, Li and Le.

Excretory pore plate oval, with short anteriomedian projection ( Fig. 15 ).

Pedipalps ( Fig. 18 ): P–2 with single seta in proximal half; P–4 short, its length smaller than height, with three short subequal setae (dorsal, medial and ventral) and a massive dorsodistal claw; P–5 with two of the seven setae very long; solenidion longer than segment.

Shape and arrangement of setae on legs segments as shown in Figs 19–21 . Number of heavy setae from trochanter to tarsus: I–Leg: 0, 1, 1, 1, 0; II–Leg: 0, 2, 2, 1, 0; III–Leg: 0, 1, 1, 1, 0. Solenidion on tibia III situated proximal to middle of segment. Acanthoid setae present on I–II-Leg-5 only, nearly straight.

Measurements, n=10. Dorsal plate L 240–250, W 145–160; setae Fch L 60–67, setae Fp and Oi L 22–29, setae Vi L 99–115, setae Oe L 95–105; setae Hi, He, Sci and Sce L 95–112; setae Li and Le L 85–95; setae Si and Se L 75–95, setae Ci L 130–145, setae Pi L 41–55, setae Pe L 48–64, setae C1 L 54–65, setae C2 L 76–93, setae C3 L 80–95, setae C4 L 83–95; coxal field L 230–240; medial margin of coxae I L 92–96, medial margins of coxae II– III L 102–112; urstigma D 14–16; excretory pore plate L 22–26, W 22–26; capitulum L 70–80; basal segment of chelicera L 70–74, chela L 14–16; pedipalpal segments (P–1–5) L: 13–16, 32–42, 22–26, 13–16, 11–13, P-4 H 22– 26; leg segments L: I–Leg-1–5: 32–38, 38–42, 42–48, 55–60, 64–74; II–Leg-1–5: 35–42, 35–39, 47–49, 60–67, 74–90; III–Leg-1–5: 41–45, 38–48, 48–51, 64–74, 85–90.

Adults. Both sexes. Coxal shield wider than long ( Fig. 24 ); W posteromedial margin of Cx-II 25–50; P-3 mediodistal seta equally distanced from dorso- and ventrodistal setae ( Fig. 25 ); II–IV-leg swimming setae numbers: 4–7 on II-Leg-4, 7–8 on II-Leg-5, 6–8 on III-Leg-4, 6–13 on III-Leg-5, 6–8 on IV-Leg-4, 8–14 on IV- Leg-5. IV-Leg-6 with 3–6 thick, short ventral setae.

Female. Genital flaps elongate (L/W ratio 2.00–2.70).

Measurements, n=5. Idiosoma L 1200–1500; seta Fch L 110–120; coxal shield L 760–940, W 875–1150; Cx- I medial L 185–250, Cx-II medial L 150–165; capitular bay L 210–240, genital bay L 180–190; genital flaps L 200–275, W 75–115; genital acetabula (ac.1–3) L: 60–80, 55–70, 40–50; basal segment of chelicera L 26 0–375, chela L 60–70; pedipalpal segments (P-1–5) L: 30–50, 130–175, 105–140, 150–200, 25–50; leg segments L: I–Leg- 1–6: 85–115, 100–140, 110–165, 175–240, 185–250; II-Leg-1–6: 85–115, 110–150, 130–175, 210–300, 225–340, 200–265; III–Leg-1–6: 100–115, 150–175, 175–215, 260–350, 280–415, 250–350; IV–Leg-1–6: 175–185, 160– 190, 210–265, 285–390, 310–390, 275–375.

Male. Genital flaps comparatively short (L/W ratio 2.1–2.4), each with 28–35 median setae and 5–8 lateral ones.

Measurements, n=3. Idiosoma L 1000–1390; coxal shield L 775–860, W 935–975; coxal field L 230–240; Cx-I medial L 255–240, Cx-II medial L 125–180; capitular bay L 110–115, genital bay L 90–105; genital flaps L 210–225, W 85–100; genital acetabula (ac.1–3) L: 62–75, 55–63, 35–50; basal segments of chelicera L 250– 285, chela L 42–48; pedipalpal segments (P–1–5) L: 35–42, 125–145, 108–120, 155–170, 42–45; leg segments L: I– Leg-1–6: 85–90, 110–140, 125–150, 185–215, 200–240, 165–200; II–Leg-1–6: 85–100, 125–150, 150–170, 225–275, 275–315, 250–300; III–Leg-1–6: 100–105, 160–180, 185–215, 300–325, 325–375, 285–340; IV–Leg-1–6: 160– 190, 175–190, 235–275, 325–370, 375–390, 310–365.

Distribution in Russia. Widely distributed in the European part of Russia ( Sokolow 1940), Asian part of Russia: West and East Siberia, Chukotka, Kamchatka, Magadan Province and Far East ( Sokolow 1940, 1950, Thor 1926, Tuzovskij 1976, Wainstein 1981, Semenchenko 2008).

Figures

FIGURES 13 – 14. Lebertia porosa Thor, 1900, larva: 13, dorsal view; 14, ventral view. Scale bar: 50 µm.

FIGURES 15 – 18. Lebertia porosa Thor, 1900, larva: 15, excretory pore plate; 16, chelicerae, lateral view; 17 — chela; 18, pedipalp. Scale bars: 15, 17 – 18 = 20 µm, 16 = 50 µm.

FIGURES 19 – 22. Lebertia porosa Thor, 1900, larva: 19, leg I; 20, leg II; 21, leg III; 22, claws of leg I. Scale bars: 19 – 21 = 50 µm, 22 = 20 µm.

FIGURES 23 – 25. Lebertia porosa Thor, 1900, female: 23, seta Fch; 24, coxal field; 12, pedipalp. Scale bars: 23, 25 = 100 µm, 24 = 200 µm.