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.