重庆巴利螨属一新种 (蜱螨亚纲:虱螯螨科)

A NEW SPECIES OF THE GENUS PARALYCUS FROM CHONGQING, CHINA (ACARI:PEDICULOCHELIDAE)

记述从七星瓢虫Coccinellaseptempunctata上采到的巴利螨属一新种 :寄巴利螨Paralycusparasitisp .nov.。

Lavoipierre (1946) erected the family Pediculochelidae and thought it presents the general features of the family Tarsonemidae. Baker and Wharton (1952) included it in the Astigmata and this viewpoint was not followed until 1970. Krantz (1970) suggested that it belonged to Pachygnathoidea but with no supportive discussion. Norton, OConnor and Johnston (1983) based on a cladistic analysis, proposed that the family represents a sister-group of the Haplochthoniidae (Oribatida). In this paper, a new species is described. All measurements are given in μm. Type specimen is deposited in the Department of Plant Protection, Southwest Agricultrual University. Paralycus parasiti, sp. nov. (Fig.1～2) ♀ Idiosoma 216μm long and 96μm wide; colourless in living. Dorsum: propodosoma is covered by a shield-shaped plate; setae ro on its front tip, la behind ro and lightly longer than it; the other setae placed on integument; pseudo-stigmatic organ ss nearly ball-shaped; hysterosoma setae c 1, d 1, e 1, f 1 are short, not reaching the bases of setae behind them; h 2 is long, reaching the bases of setae ps; length of setae ro 16, la 20, exa 12, exp 6, in 35, c 1 12, c 2 16, c 3 23, cp 20, d 1 10, d 2 16, e 1 12, e 2 16, f 1 20, f 2 20, h 1 20, h 2 23, h 3 16, ps 1 16, ps 2 31, ps 3 16. Venter: Setae between coxae II are long, reaching the bases of setae between coxae I; each with one pair of setae between coxae III and IV; genital open behind coxae IV, with 2 pairs of acetabula and 4 pairs of genital setae; anal pole terminally, with 3 pairs of adanal setae; length of setae ag 2 6, ag 3 4, ag 4 8, ag 5 10, ad 1 10, ad 2 35, ad 3 10. Legs: with one peg on trochanter I and II respectively; on tibiae III φ is at the base of the dorsal seta; chaetotaxy of legs (solenidion included )are as follows: coxae (I～IV),2-1-2-2; trochanters, 0-0-1-0; femora, 2-2-2-2; genua, 4-3-0-0; tibiae, 3-2-2-2; tarsi, 8-7-5-5. ♂ Unknown. Holotype ♀, from Coccinella septempunctata, Chongqing City (29.5°N, 106.5°E), Oct. 20,2000;by Zhang Aihuan. This new species resembles Paralycus chongqingensis, FAN Qing-hai,1996,but it can be distinguished from the latter by: with 4 pairs of genital setae instead of 3 pairs; f seta series not reaching the bases of seta series behind them.