Lebertia (Pilolebertia) extendia, Wang & Jin & Guo, 2016

Wang, J., Jin, D. & Guo, J., 2016, A new species and new record of the water mite genus Lebertia Neuman, 1880 (Acari: Hydrachnidia, Lebertiidae) from China, Acarologia 56 (1), pp. 121-128 : 124-126

Lebertia (Pilolebertia) extendia n. sp.

( Fig. 3-4 )

Type series — Holotype: Male. Slide number GZ-IV-19981002, from Maolan National Nature Reserve , Libo County, Guizhou Province, P. R. China (25°82.23’N, 107°37.21’E), 800 m asl, collected in Maohe river near a village, leg. Jianjun Guo, 02 October, 1998 . Paratype: 1 Male. Slide number GZ-IV19971004, same data as holotype, leg. Daochao Jin, 04 October, 1997. Both holotype and paratype are deposited in the Institute of Entomology , Guizhou University, Guizhou Province, P. R. China

Diagnosis — P-3 distal setae pectinated, mediodistal seta inserted close to the ventrodistal seta. The ventral seta insertions divide the ventral margin of P-4 into 1: 1: 1 ( Fig. 3B ). Medial suture Cx-I/II almost equal in length ( Fig. 3A ). Coxal field extended and the posterior margin of Cx-IV almost reaching to the posterior end of the genital field.

Description — Male (n = 2). Colour yellowishbrown. Idiosoma almost round in outline, 713 (700) in L and 653 (610) in W. Integument smooth on the dorsal surface, palps, legs, and coxal field with reticulated frame work (mesh size 8 – 13). Coxal field extending and almost embracing the posterior margin of the genital field; Coxal field 755 (760) in L, 660 (650) in W; Cx-I/II ML 194 (205) / 205 (188), ratio 0.95 (1.09); Cx-II narrow, posterior margin approximately 19 (25) in W, posteromedial margin of Cx- IV forming a right angle. Genital field with three pairs of acetabula, the first two pairs rectangular, and the third pair almost round in outline ( Fig. 3A ). Length of acetabula: Ac-1, 60 (53); Ac-2, 50 (51); Ac- 3, 37 (38); genital flap 179 (165) in L; genital field 155 (140) in W. Excretory pore smooth. Capitulum ventral L 190 (198), chelicera L 255 (275) ( Fig. 3C ).

Numbers of swimming setae: II-L-5, 6 (8); III-L-4, 6 (7); III-L-5, 7 (10); IV-L-4, 9 (7); IV-L-5, 10 (8). IV-L- 1 with one dorsal and two dorsodistal setae. Ventral setae on L-III-IV ( Figs. 4E, 4F ): III-L-1, 1 (1); III- L-2, 1 (2); III-L-3, 1 (1); III-L-4, 3 (3); III-L-5, 6 (7) (two strong and peg-like, others hair-like); III-L-6, 7 (8) (hair-like); IV-L-1, 1 (1); IV-L-2, 1 (1); IV-L-3, 1 (1); IV-L-4, 3 (3); IV-L-5, 6 (6); IV-L-6, 3 (3). P-2 with five setae, the ventral seta as long as or even slightly longer than the ventral length of P-2; P-3 distal setae pectinated, dorsal setae separated from each other, the mediodistal seta inserted close to the ventrodistal seta (distance approximately 9 – 11); P- 4 distally narrowed with four fine dorsal setae and one minute peg-like seta (3 – 4 in length), the ventral seta insertions divided the ventral margin into 1: 1: 1 ( Fig. 3B ). P-2/P-4 0.95 (0.89) in L and total length of palp 410 (470). L/H of the palp: P-1, 31 (38)/53 (54), ratio 0.58 (0.70); P-2, 119 (133)/75 (88), ratio 1.59 (1.51); P-3, 100 (115)/63 (64), ratio 1.59 (1.80); P-4, 125 (150)/43 (48), ratio 2.90 (3.13); P-5, 38 (40)/16 (18), ratio 2.38 (2.22). L/H of legs: I-L-1, 75 (88)/50 (70), ratio 1.5 (1.26); I-L-2, 105 (145)/68 (73), ratio 1.54 (1.99); I-L-3, 118 (125)/60 (68), ratio 1.97 (1.84); I-L-4, 175 (175)/58 (60), ratio 3.02 (2.92); I-L-5, 163 (183)/45 (48), ratio 3.62 (3.81); I-L-6, 150 (160)/38 (38), ratio 3.95 (4.21); II-L-1, 63 (80)/63 (75), ratio 1.00 (1.07); II-L-2, 108 (113)/75 (80), ratio 1.44 (1.41); II-L-3, 108 (138)/65 (75), ratio 1.66 (1.84); II- L-4, 188 (208)/58 (70), ratio 3.14 (2.97); II-L-5, 218 (230)/45 (55), ratio 4.84 (4.18); II-L-6, 188 (213)/45 (50), ratio 4.18 (4.26); III-L-1, 86 (80)/65 (78), ratio 1.32 (1.03); III-L-2, 147 (140)/78 (80), ratio 1.88 (1.75); III-L-3, 159 (175)/72 (73), ratio 2.21 (2.40); III- L-4, 252 (245)/70 (68), ratio 3.60 (3.60); III-L-5, 263 (288)/53 (58), ratio 4.96 (4.97); III-L-6, 247 (238)/61 (55), ratio 4.05 (4.33); IV-L-1, 174 (185)/101 (98), ratio 1.72 (1.89); IV-L-2, 166 (148)/86 (85), ratio 1.93 (1.74); IV-L-3, 197 (205)/85 (78), ratio 2.32 (2.63); IV- L-4, 278 (275)/76 (70), ratio 3.66 (3.93); IV-L-5, 274 (300)/63 (63), ratio 4.35 (4.76); IV-L-6, 246 (265)/66 (65), ratio 3.73 (4.08).

Etymology — "Extend" means "enlarge", the new species is named after the enlarged posterior margin of Cx-IV.

Remarks — The new species can be distinguished from other species by the mediodistal seta inserted close to the ventrodistal seta and the extended posterior margin of Cx-IV.

Lebertia (Pilolebertia) insignis Neuman, 1880 is similar to the new species in the position of the mediodistal seta on P-3 and the distributions of ventral setae on P-4. Nevertheless, there are still many differences: 1) medial suture Cx-I is slightly longer than Cx-II in L. insignis (1.2 – 1.3 in L. insignis ), but in the new species medial sutures Cx-I/II are almost equal in length (ML 0.95); 2) P-2 of the new species is slightly longer than that of L. insignis (P-2/P-4 L 0.78 – 0.80 in L. insignis , but 0.95 in the new species); 3) the Cx-IV posterior margin is truncated in L. insignis , but in the new species the coxal field extends with the posterior margin of Cx-IV almost reaching to the posterior end of the genital field; 4) II- L-5 with 2 swimming setae in L. insignis , while the new species has 6 – 10 swimming setae on II-L-5. ( Gerecke 2009; Bursali et al. 2011).

Female unkown.

Habitat — Maohe river near Banzhai village.

Distribution — China, known only from the type locality.

Figures

FIGURE 3: Lebertia (Pilolebertia) extendia (Male): A – Ventral view; B – Palp; C – Gnathosoma; D – Genital field. Scale bars: A–D = 100 µm.

FIGURE 4: Lebertia (Pilolebertia) extendia (Male): E – III-L-1 – 6; F – IV-L-1 – 6. Scale bars: E–F = 100 µm.