Lebertia (Pilolebertia) saxonica Thor 1911

• Main Author: Tuzovskij, Petr V.
• Format: Text
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Arachnida; Trombidiformes; Lebertiidae; Lebertia; Lebertia saxonica; Chaun; Magadan; Seta; Chukotka; Kamchatka; Kamtschatka
• Online Access: https://dx.doi.org/10.5281/zenodo.6073571; https://zenodo.org/record/6073571

Lebertia (Pilolebertia) saxonica Thor, 1911 (Figs 26–39) Material examined . Larvae (n = 38) were reared from six females: one female collected in a could brook near the village Postyltsevo (August 2000) and one female in the Ild stream near village Mar’ino (August 2006), Nekouz District, Yaroslavl Province; four females from the Pucheveem stream (inflow of the Chaun river) Chaun District, Magadan Province (August-September 1982). The duration of the embryonic period was 12–15 days. Diagnosis. Larva. Dorsal plate elongated (L/W ratio 1.5–1.8); excretory pore plate oval; P- 4 short (L <H); urstigma small (D 9–11 µm); I–III-Leg– 5 comparatively long (78–90, 89 – 106, 102–128 µm, respectively); III– Leg- 5 without acanthoid seta. Adult. P- 3 mediodistal seta close to the ventrodistal seta (Fig. 39). Redescription. Larva. Dorsal plate elongate (L/W ratio 1.5–1.8) (Fig. 26), its anterior margin slightly convex with small median incision, posterior margin pointed. Nine pairs of long setae ( Oe, Hi, He, Sci, Sce, Li, Le, Si, Se ) situated in the soft wrinkled membrane: Li, Le, Si and Se shorter than Hi, He, Sci, Sce and Oe . Urstigma small. Excretory pore plate oval or nearly circular, with short anteriomedian projection (Figs 28–29). Pedipalps (Fig. 32): P– 2 with single dorsal seta in proximal part; P– 4 short, its length smaller than height, with three short subequal setae (two dorsal and one medial); P– 5 with two of the seven setae very long; solenidion shorter than segment. Shape and arrangement of setae on legs segments as shown in Figs 33–35. 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 near middle of segment. Acanthoid setae present on I–II-Leg- 5 only, all bent two times. Measurements, n= 10. Dorsal plate L 260–295, W 145–195; setae Fch L 64–96, setae Fp and Oi L 26–35, setae Vi L 135–175, setae Oe , Hi, He, Sci and Sce L 125–145; setae Li and Le L 100–135; setae Si and Se L 95–130, setae Ci L 145–195, setae Pi L 50–80, setae Pe L 60–120, setae C 1 L 75–95, setae C 2 L 85–135, setae C 3 L 110–145, setae C 4 L 110–160; coxal field L 245–320; medial margin of coxae I L 83–96, medial margins of coxae II–III L 105–117; ursrigma D 9–11; excretory pore plate L 35–42, W 32–40; capitulum L 86–103; basal segment of chelicera L 73–93, chela L 16–23; pedipalpal segments (P- 1–5) L: 12–16, 35 – 45, 30 – 35, 16 – 19, 11 – 13, P- 4 H 20– 26; leg segments L: I–Leg- 1–5: 38–45, 50 – 58, 53–61, 67 – 80, 78–90; II–Leg- 1–5: 44–48, 50 – 55, 51–61, 73 – 96, 89–106; III–Leg- 1–5: 5 4–64, 54– 61, 54–64, 76 – 99, 102–128. Adult. Both sexes. Coxal shield wider than long (Fig. 38); W posteromedial margin of Cx-II 25–45; P- 3 mediodistal seta near ventrodistal seta (Fig. 39); II–IV-Leg swimming setae numbers: 6–8 on II-Leg- 5, 6–10 on III- Leg- 4, 8–15 on III-Leg- 5, 6–12 on IV-Leg- 4, 9–15 on IV-Leg- 5. IV-Leg- 6 with 1–5 thin pointed and 3–6 thick, short with obtuse tips spine-like setae. Female. Genital flaps L/W ratio 2.0–2.2. Measurements, n= 5. Idiosoma L 960–1700; seta Fch L 110–120; coxal shield L 680–850, W 750–825; Cx-I medial L 185–225, Cx-II medial L 140–190; capitular bay L 190–215, genital bay L 150–200; genital flaps L 190–265, W 85–100; genital acetabula (ac. 1–3) L: 48–78, 50 – 73, 30 – 54; basal segment of chelicera L 24 0–300, chela L 40–45; pedipalpal segments (P- 1–5) L: 30–45, 115 – 155, 90 – 125, 125–180, 30 – 35; leg segments L: I–Leg- 1– 6: 85–90, 100 – 125, 115–140, 160 – 225, 180 – 225, 160 – 215; II-Leg- 1–6: 75–95, 110 – 140, 125–175, 215 – 290, 225– 315, 205 – 290; III–Leg- 1–6: 85–100, 150 – 215, 160 – 210, 250–325, 310 – 375, 250 – 325; IV–Leg- 1–6: 130–175, 150 – 215, 200–265, 285 – 375, 310–390, 260 – 365. Male. Genital flaps elongate (L/W ratio 2.0–2.57), with 28–35 median setae and 5–8 lateral ones (Fig. 41). Measurements, n= 3. Idiosoma L 930–1125; seta Fch L 105–115; coxal shield L 610–890, W 700–875; Cx-I medial L 150–375, Cx-II medial L 110–165; capitular bay L 160–250, genital bay L 190–225; genital flaps L 160–225, W 75–100; genital acetabula (ac. 1–3) L: 42–72, 40 – 66, 27 – 50; basal segment of chelicera L 18 0–295, chela L 30–42; pedipalpal segments (P– 1–5) L: 30–42, 95 – 150, 78 – 125, 120–175, 27 – 42; leg segments L: I–Leg- 1–6: 60–100, 80 – 125, 90–165, 125 – 225, 135–240, 100 – 200; II–Leg- 1–6: 75–100, 90 – 150, 105–175, 160 – 275, 225–325, 180 – 290; III–Leg- 1–6: 75–115, 1 25–175, 35 – 225, 210–350, 250 – 400, 225 – 350; IV–Leg- 1–6: 160–190, 175 – 190, 235–275, 325 – 370, 375–390, 310 – 365. Remarks. The Asian larvae and adults of Lebertia saxonica are larger than European specimens and are characterized by the maximum values in the measurements. Distribution in Russia. European part of Russia: Leningrad Province (Sokolow 1940), Yaroslavl Province, Samara Province; Asian part of Russia: Kamchatka (Thor 1926), Magadan Province and Chukotka. : Published as part of Tuzovskij, Petr V., 2016, Larval morphology of Lebertia insignis Neuman, 1880, L. porosa Thor, 1900 and L. saxonica Thor, 1911 (Acari, Hydrachnidia: Lebertiidae), pp. 295-310 in Zootaxa 4121 (3) on pages 303-309, DOI: 10.11646/zootaxa.4121.3.4, http://zenodo.org/record/261168 : {"references": ["Thor, S. (1911) Neue Acarina aus Asien (Kamtschatka). I. Zoologischer Anzeiger, 38 (18 - 19), 420 - 427.", "Sokolow, I. I. (1940) Hydracarina - vodyanye kleshchi. Chast' I. Hydrachnellae. Fauna SSSR (novaya seriya No 20. Paukoobraznye, 5 (2) [Hydracarina - the aquatic mites. Part I. Hydrachnellae. Fauna of the USSR. (nouv. ser., no 20), Arachnides, 5 (2)]. Nauka, Moscow-Leningrad, 24 + 511 pp. [in Russian]", "Thor, S. (1926) Die Acarina der Kamtschatka-Expedition 1908 - 1909. Eghegodnik Zoologicheskogo Museya Akademii Nauk, 27, 131 - 174."]}