Kuzinellus (Acari: Phytoseiidae) from China

Two species of the genus Kuzinellus (Acari: Phytoseiidae) are known in China. We re-describe them based on types and fresh specimens and provide updated information and illustrations. It is the first time that Kuzinellus trisetus is recorded in Shanxi province.


Introduction
As a family of valuable beneficial predators Phytoseiidae has received an increasing attention in the last three decades (Helle and Sabelis, 1985;Lindquist et al., 1996;McMurtry and Croft, 1997;Sabelis and Van Rijn, 1997;Gerson et al., 2003;Moraes et al., 2004). To date more than 2,750 species have been described (Demite et al., 2017) and some species are commercially produced for controlling spider mites, thrips and whiteflies. The genus Kuzinellus Wainstein, 1976 is relatively small and consists of about 51 described species (Demite et al., 2017;Kamran et al., 2017). Only two species of this genus are known from China, an Oriental species, K. cervix (Wu and Li, 1984) from Hubei province and a Palaearctic species, K. trisetus  from Liaoning province. Kuzinellus cervix was subsequently found in Fujian, Hunan and Jiangxi (Wu et al., 2009) but there was no record of K. trisetus from other provincial areas of the country. During a survey of phytoseiid mites of Shanxi province, K. trisetus was discovered from several localities. In this paper, we re-described both species based on the original types and fresh specimens of K. trisetus.
ADULT MALE. Unknown.

Remarks
In their original description Wu and Li (1984) miscounted the number of dorsal setae, overlooked z6 and incorrectly illustrated the sternal shield. Wu et al. (1997)  We herein confirm their corrections and changes. Apart from these we have noted and illustrated the following characters which were not presented in the original and subsequent publications (Wu and Li, 1984;Wu et al., 1997;2009): lyrifissures, gland openings and muscle marks on idiosoma; atrium, major and minor ducts of insemination apparatus, and legs I-III. The second tooth of the fixed digit of chelicera is very small and situated next to the apical tooth.
The margins of the platelets bearing st4 and iv2 were not discernible in the long preserved specimens. This species was originally described as Typhlodromus (Anthoseius) cervix and listed as such in the catalog of Moraes et al. (1986) and in the Phytoseiidae database of Demite et al. (2017), which would need to be updated.
ADULT MALE. Unknown.

Remarks
This is the first report of Kuzienllus trisetus in Shanxi province. We have noted and illustrated the following characters which were not presented in the original publication : lyrifissures, gland openings and muscle marks on idiosoma, and legs I-III. The detailed structure of the insemination apparatus is given to show the unevenness of the calyx. The number of teeth on the movable digit is variable, from two to three. The apical tooth on the fixed digit is sometimes bifurcate. The areas around st4 and iv2 were not discernible in the long preserved specimens.