Systematic and Applied Acarology Systematic and Applied Acarology Society ISSN: 1362-1971 Vol. 3, 1998, pp. pp. 133-136

A new species of the rhenanus species group of genus Typhlodromus in China (Acari: Phytoseiidae)

WEI -NAN WU & JIAN-FENG OU

Guangdong Institute of Entomology, 105 Xingang Road West, Guangzhou 510260, China

Accepted: 29 April 1998

Code Number:AA98021
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Abstract

A new species, Typhlodromus cuii sp. nov. from Davidia sp. in Yunnan, China, is described. The type specimens are deposited in the Guangdong Institute of Entomology, Guangzhou, China.

Key words: Acari, Phytoseiidae, Typhlodromus, rhenanus species group, new species.

Introduction

Chant and McMurtry (1994) were the first to review the subfamily Typhlodrominae, including genera, subgenera and species group. The rhenanus species group of genus Typhlodromus was proposed by Chant (1959). Now the genus Typhlodromus contains two subgenera, namely Typhlodromus and Anthoseius . There are nine species groups and 256 species in the subgenus Anthoseius ; among them 206 known species are in the rhenanus species group (Chant & McMurtry 1994) and 25 species of this species group have been collected in China (Wu et al. 1997). This paper describes a new species and redescribes Typhlodromus orientalis Wu. The unit of measurement is micrometre.

The genus Typhlodromus Scheuten

Type species: Typhlodromus pyri Scheuten.

The rhenanus species group Chant, 1959.

Exemplar species: Seiulus rhenanus Oudemans

Typhlodromus rhenanus (Oudemans), Nesbitt, 1951: 38-39

Diagnosis : 1) Female idiosomal setal pattern 12A:8A\ JV:ZV; setae z3, s6, J2, S2, S4, S5, R1, JV2, JV3, JV4 and ZV3 present; setae z6, J1, Z1 and Z3 absent. 2) Dorsal setae short to medium in length. 3) Female ventrianal shield generally subtriangular or subquadrate. 4) Leg IV with 1-3 macrosetae. 5) Shape of spermatheca variable. 6) Chelicerae of most species with few teeth.

Typhlodromus cuii Wu et Ou sp. nov. (Figures 1-4)

Female: Dorsal shield length 275-309, width at level of s4 189-191. Dorsal shield smooth. Adult female dorsal setae pattern 12A:8A, namely, podosoma with 12 pairs of setae (j1, j3, j4, j5, j6, z2, z3, z4, z5, s4, s6, r3) and opisthosoma with 8 pairs of setae (J2, J5, Z4, Z5, S2, S4, S5, R1). Sublateral setae r3 and R1 on lateral integument. Most dorsal setae elongate, setiform and smooth, except Z5 serrate. Sternal shield length 76, width at the level of posterior margin 76, with 3 pairs of setae, metasternal setae on integument. Genital shield width at posterior margin 83, with 1 pair of setae. Ventrianal shield subquadrate, length 91, width 83, with 4 pairs of setae (ZV3, JV1, JV2, JV3) and preanal pore near setae JV2. Setae ZV1, ZV3, JV4, JV5 on integument surrounding ventrianal shield, JV5 length 51. Peritreme extending to near j1. Chelicera movable digit length 24, 4 teeth, fixed digit length 28, multidentate. Spermatheca as Figure 3. Leg IV with one macrosetae on basitarsus. Chaetotaxic formula genu IV 2,2-2/0-1; tibia IV 1,2-0/1,1. Measurements of setae as follows: j1 21-24, j3 24-28, j4 14-21, j5 17-21, j6 17-22, J2 21-24, J5 7-10, z2 7-12, z3 28-33, z4 28-31, z5 17-21, Z4 31-38, Z5 55-57, s4 27-34, s6 27-41, S2 34-44, S4 35-38, S5 34-38, r3 21-28, R1 21.

Male : Unknown

Holotype female and 8 paratype females were collected on Davidia sp., 15 July, 1981, by Mr. Yun-Yi Cui at Wei Xi County, Yunnan Province.

Remark : The new species is similar to Typhlodromus orientalis Wu (1981) and Typhlodromus porus Wu (1988), but differs from them in leg IV with one macroseta in the new species but with three macrosetae in the latter two species. The shape of spermatheca and ventrianal shield is also different in the three species.

Figures 1-4. Typhlodromus cuii sp. nov. (female) 1, dorsal shield ; 2, ventral surface; 3, spermatheca; 4, leg IV.

Typhlodromus (Typhlodromus) orientalis Wu, 1981:210-211. Type locality : Fujian

Female : Dorsal shield length 302-308, width 200-205, slightly reticulate on lateral margin. Most dorsal setae elongate, setiform and smooth. One capitate macroseta on genu, tibia and basitarsus of leg IV. Measurements of setae: j1 20, j3 45, j4 28, j5 28, j6 33, J2 43, J5 8, z2 25, z3 38, z4 40, z5 30, Z4 53, Z5 65, s4 44, s6 50, S2 49, S4 35, S5 30, r3 35, R1 20.

Male: Unknown

Specimens examined : Holotype female.

Distributions : Fujian, Guangdong.

Figures 5-8. Typhlodromus orientalis Wu (female) 5, dorsal shield ; 6, ventral surface; 7, spermatheca; 8, leg IV.

The authors thank Prof. Hui-fu Wang and Mr.Yun-ye Cui (Institute of Zoology, Academia Sinica, Beijing) for the collection and loan of specimens and for giving me the opportunity to study the specimen described in this paper. The authors also thank Dr. Zhi-Qiang Zhang (International Institute of Entomology, London) for initial review of the manuscript.

References

Chant, D.A. (1959) Phytoseiid mites (Acarina: Phytoseiidae). Canadian Entomologist, Supplement, 12, 45-166.

Chant, D.A. & McMurtry , J.A. (1994). A review of the subfamilies Phytoseiinae and Typhlodrominae (Acari: Phytoseiidae). International Journal of Acarology, 20 (4), 223-310.

Nesbitt, H.H.J. (1951) A taxonomic study of the Phytoseiinae (family Laelaptidae) predaceous upon Tetranychidae of economic importance. Zoologische Verhandel ingen, 12, 1-64.

Wu, W.-N (1981). Descriptions of five new species of phytoseiid mites from Fujian (Acarina: Phytoseiidae). Wuyi Science Journal, 1, 205-213.

Wu, W.-N. (1988). New species and new record of phytoseiid mites from Northeast China, Genus Typhlodromus Scheuten (1) (Acarina: Phytoseiidae). Acta Entomologica Sinica , 31(1), 99-106

Wu, W.-N., Liang L.-R. & Lan W.-M. (1997). Economic Insect Fauna of China (Acari: Phytoseiidae) Fasc.53. Beijing, Science Press. pp. 167- 223.

Copyright 1998 Systematic and Applied Acarology Society (SAAS)

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