Water mites of subgenus Lebertia (Lebertia) Neuman from China (Hydrachnidia: Lebertiidae) Author Wang, Jialin Author Jin, Daochao Author Yi, Tianci Author Guo, Jianjun text Zoological Systematics 2016 41 1 54 63 journal article 10.11865/zs.201603 2095-6827 5367272 6BF23330-8BB3-4954-A291-725BC6F1963E 3.2 Lebertia ( Lebertia ) cylinderia Wang & Guo , sp. nov. ( Figs 8–15 ) Diagnosis. Idiosoma round in outline, integument with long lines at the dorsal surface ( Fig. 12 ). P-3 with 2 dorsal setae inserted proximally. P-4 cylinderical in outline ( Fig. 10 ). Medial suture Cx-I and Cx-II nearly equal in length, posterior margin of Cx-II 40 in width. IV-L-6 without dorsal seta, low number or no swimming setae on legs ( Fig. 15 ). Description. Male. Idiosoma ( Figs 8–9 ). Color yellowish-brown. Idiosoma round in outline, 973–980 long and 824–840 wide.Integument with long lines on dorsal surface. Gf 197–240 in length and 130–167 in width. Acetabula 3 pairs, first pair 50–55 in length, second 50–58 in length, third 38–45 in length ( Fig. 13 ). Coxal plates single group, 580–677 in length and 550–609 in width; Medial suture Cx-I and Cx-II nearly equal in length, Cx-I ML 138–185, Cx-II ML 125–170, Cx-I/Cx-II ML ratio 1.08–1.10, posterior margin of Cx-II 38–40 in width, suture lines between Cx-III and Cx-IV reaching to inner 1/2 of plate; Cx-IV with obtuse posteromedial angels at both lateral sides behind genital field. Ib-Gf 300–350; Ib-Ap 700–761. Ib U-shaped, depth 150–175, width 80–84. Excretory pore smooth. Ventral margin of gnathosoma smooth, Gnathosoma length 188–225, chelicera length 225–264 ( Fig. 11 ). Figures 8–9. Lebertia ( Lebertia ) cylinderia Wang & Guo , sp. nov. , male. 8. Ventral view. 9. Dorsal view. Scale bars = 200 µm. Figures 10–15. Lebertia ( Lebertia ) cylinderia Wang & Guo , sp. nov. , male. 10. Palp. 11. Gnathosoma. 12. Dorsal integument structure. 13. Genital field. 14. I-L-3–6. 15. IV-L-3–6. Scale bars: 10, 14–15 = 100 µm; 11–12 = 50 µm; 13 = 200 µm. Palp ( Fig. 10 ). P-2 with 5 setae, of which 2 dorsodistal setae long and thin, 2 dorsal setae much shorter and peg-liked, ventral seta as long as ventral length in L, inserted at 4/5 of segment. P-3 with 5 setae, ventrodistal seta slightly away from ventrodistal segment edge (distance about 12.5–14) and elongated (can surpass tip of P-5), mediodistal seta inserted close to dorsodistal seta (distance of insertions about 6–8); dorsal setae inserted proximally, separated from each other (distance about 16.5–19). P-4 cylindrical in shape with maximum H in proximal and terminal parts, ventral seta insertions divided ventral margin into 2: 3: 3. Dorsal length/height of palp segments: P-1, 38–40/40–43 (ratio 0.93–0.95); P-2, 88–102/55–72 (ratio 1.42–1.6); P-3, 88–105/44–46 (ratio 1.96–2.28); P-4, 100–121/33–34 (ratio 3.03–3.56); P-5, 34–35/18–19 (ratio 1.79–1.94). Total length of palp, 349–397. Legs ( Figs 14–15 ). I-L-3 with 12 setae.I-L-4 with 2 dorsal setae and 1 ventral seta; I-L-5 with 3 dorsal setae and 1 ventral seta. I-L-6 with 5 ventral setae and 2 dorsal setae. IV-L-3 bearing 2 dorsal setae and 3 dorsal setae on segment. IV-L-4 with 2 dorsal setae and 3 ventral setae. IV-L-5 with 3 dorsal setae and 4 ventral setae. IV-L-6 bearing 3 setae, of which 2 dorsal setae small and short, 1 dorsodistal seta strong and elongated. Length/height of legs: I-L-3, 90–118/48–60 (ratio 1.88–1.97); I-L-4, 130–159/48–55 (ratio 2.70–2.89); I-L-5, 138–173/45–50 (ratio 3.07–3.46); I-L-6, 125–133/38–49 (ratio 2.71–3.29); IV-L-3, 158–183/48–68 (ratio 2.69–3.29); IV-L-4, 205–248/45–59 (ratio 4.10–4.20); IV-L-5, 225–287/45–54 (ratio 5.00–5.31); IV-L-6, 200–266/45–55 (ratio 4.44–4.84). Numbers of peg-like setae on IV-L-3–6: IV-L-3, 6; IV-L-4, 8; IV-L-5, 5. No swimming seta on legs. Female. Unknown. Material examined. Holotype , male, Hanasi Lake , Xinjiang , China ( 47°14.59'N , 87°12.97'E ; elev. 1 374 m ), coll. Daochao Jin , 13 August 1997 , dissected and slide mounted in Koenike fluid, slide number XJ-IV-1997081301. Paratypes : 3 males , slide number XJ-IV-1997081302, XJ-IV-1997081303 and XJ-IV-1997081304, same data as holotype . Etymology. “ cylinder ” means “tube-shape things”. The new species is named after the cylindrical shape in P-4. Habitat. River, lake and stream. Distribution. Palaearctic Region ( China ( Xinjiang )). Remarks. This new species is similar to Lebertia ( Lebertia ) sparsicapillata Thor, 1905 from Germany in the following points: 1) the medial sutures of Cx-I/II are similar in length (Cx-I/II ML ratio 0.9–1.3) ( Fig. 8 ); 2) The uniform shape of P-4 and the ventral setae on IV-L-6 ( Figs 10, 15 ). But the new species can be distinguished from the later by the following: 1) III-L-5 with 1–2 and IV-L-5 with 2 swimming setae in L. sparsicapillata , while the new species without swimming seta on legs; 2) IV-L-6 of L. sparsicapillata with 2–3 dorsal setae while the new species without ( Fig. 15 ); 3) P-2 of L. sparsicapillata with 1 smooth ventral seta, but P-2 of L. cylinderia with 1 clearly pectinated ventral seta: 4) the genital flap much smaller in L. sparsicapillata (Gf: 160–190 in males, 190–210 in females, while in the new species Gf 197–240 in male).The data of L. sparsicapillata is from Gerecke (2009) . The new species is also compared with L. ( L. ) subtilis Koenike, 1902 from Alps which is similar to the new species by having a low number of ventral setae on IV-L-6 and no swimming seta on legs. There are significant differences between these 2 species: 1) the genital field of L. subtilis with high number of medial setae (about 50 on each flap) while the new species with only 6 pairs of setae on the genital flaps ( Fig. 13 ); 2) medial suture Cx-I much longer than Cx-II of L. subtilis (Cx-I/II ML ratio 1.54 in L. subtilis ) while the medial suture of Cx-I and Cx-II are similar in length in the new species ( Fig. 8 ): 3) ventral seta of P-2 of L. subtilis inserted at the distal edge, while the ventral seta inserted slightly away from the distal edge, but at 4/5 of the segment in the new species ( Fig. 10 ). The data of L. subtilis is from Gerecke (2009) .