First record of Pionacercus Piersig(Acari:Hydrachnidia:Pionidae)from China with redescriptions of two species

The water mite genus Pionacercus Piersig,1894 with two species,Pionacercus anadyrensis Tuzovskij,1990 and Pionacercus leuckartii Piersig,1894,is reported for the first time from China.P.anadyrensis Tuzovskij,1990 and P.leuckartii Piersig,1894 are redescribed and illustrated.

A newly recorded and a new species of torrenticolid mites (Acari:Hydrachnidiae) from China

A new species of Torrenticola(Acari:Hydrachnidia)is reported from China,namely T.(T.)gladiusirostrum Jia,Gu&Guo,sp.nov.And T.(Megapalpis)distans K.O.Viets,1981 is recorded in China for the first time.Both descriptions and illustrations of these species are provided.The new species is characteristic by:dorsal plate arrangement 2+1;infracapitular bay U-shaped,deep and wide,V2 almost at same level of Ap;gnathosoma ventral apodeme short and blunt,rostrum flat and sword-shaped;P-2 and P-3 ventral processes smooth and pointed,and P-2 ventral process curved upwards,P-4 with two ventral extensions.

Characterization and functional analysis of chitinase family genes involved in nymph-adult transition of Sogatella furcifera

Chitinase degrades chitin in the old epidermis or peritrophic matrix of insects,which ensures normal development and metamorphosis.In our previous work,we comprehensively studied the function of SfCht7 in Sogatella furcifera.However,the number and function of chitinase genes in S.furcifera remain unknown.Here,we identified 12 full-length chitinase transcripts from S.furcifera,which included nine chitinase(Cht),two imaginal disc growth factor(IDGF),and one endo-β-N-acetylglucosaminidase(ENGase)genes.Expression analysis results revealed that the expression levels of eight genes(SfCht3,SfCht5,SfCht6-1,SfCht6-2,SfCht7,SfCht8,SfCht10,and SfIDGF2)with similar transcript levels peaked prior to molting of each nymph and were highly expressed in the integument.Based on RNA interference(RNAi),description of the functions of each chitinase gene indicated that the silencing of SfCht5,SfCht10,and SfIDGF2 led to molting defects and lethality.RNAi inhibited the expressions of SfCht5,SfCht7,SfCht10,and SfIDGF2,which led to downregulated expressions of chitin synthase 1(SfCHS1,SfCHS1a,and SfCHS1b)and four chitin deacetylase genes(SfCDA1,SfCDA2,SfCDA3,and SfCDA4),and caused a change in the expression level of two trehalase genes(TRE1 and TRE2).Furthermore,silencing of SfCht7 induced a significant decrease in the expression levels of three wing development-related genes(SfWG,SfDpp,and SfHh).In conclusion,SfCht5,SfCht7,SfCht10,and SfIDGF2 play vital roles in nymph–adult transition and are involved in the regulation of chitin metabolism,and SfCht7 is also involved in wing development;therefore,these genes are potential targets for control of S.furcifera.

Two new species and two newly recorded species of Tenuialidae in China,with an updated key to the family(Acari:Oribatida:Gustavioidea)

In this work, two new species belonging to the family Tenuialidae from China are described： Tenuiala hubeiensis sp. nov., Hafenrefferia eurycuspis sp. nov. Two species, Tenuiala nuda Ewing, 1913 and Hafenrefferia gilvipes （Koch, 1839）, are reported for the first time in China. A key is provided for adult identification of the world known species of Tenuialidae. All examined specimens are deposited in the Institute of Entomology, Guizhou Universiy （GUGC）, Guiyang, Guizhou.

Water mites of subgenus Lebertia(Lebertia) Neuman from China(Hydrachnidia: Lebertiidae)

This paper deals with four species belonging to the subgenus Lebertia （Lebertia） Neuman, 1880 from China, including two new species to science, L. （L.） cylinderia Wang ＆ Guo, sp. nov. and L. （L.）pseudomaglioi Wang ＆ Guo, sp. nov., and one new record to China, L. （L.）fimbriata Thor, 1899. A key to the subgenus is provided. The specimens examined are deposited in the Institute of Entomology, Guizhou University, P. R. China （GUGC）.

Wandesia(s.str.)boyani Li&Guo,sp.nov.,a new species representing a newly recorded subfamily Wandesiinae Schwoerbel,1961 from China

A new species,Wandesia(s.str.)boyani Li&Guo,sp.nov.,is described and illustrated in detail,which is collected from Qinghai-Tibet plateau,P.R.China,and represents a newly recorded subfamily Wandesiinae(Acari:Hydrachnidiae:Hydryphantidae)to Chinese fauna.The new species is distinguished from its congeners by having stalked acetabula ranged triangularly,developed pregenital sclerite lily-like,E4 at the middle of Ac-1 and Ac-2.

A new species representing a new record genus Neoatractides from China(Acari: Hydrachnidia: Torrenticolidae)

A new species, Neoatractides（Heteratractides） proclusterosetus sp. nov., is described and illustrated in detail, which represents a new recorded genus Neoatractides Lundblad, 1941 and subgenus Heteratractides Lundblad, 1941 from China. The diagnosis of the subgenus Heteratractides is provided. The new species can be distinguished from other species by the dorsal shield consisting of two pairs of small dorsal platelets and a large dorsal plate. A key to the known species worldwide of the subgenus is provided. The type specimen is kept in the Institute of Entomology, Guizhou University, Guiyang, P. R. China（GUGC）.

Integrative approach of morphology and geometric morphometrics to species delimiation in Torrenticolidae(Acari:Hydrachnidiae)

This paper explores the integrative utilization of morphology and geometric morphometrics in order to deal with sibling species in Torrenticolidae. The results suggest:(1) Features of anterior margins of coxae, dorsoglandularia 1–4 and infracapitulum can be utilized in landmark-based geometric morphometrics approach;(2) A new species, Torrenticola brevisuturae Gu & Guo, sp. nov., is reported in this paper.

A new species of the genus Stygothrombium, representing a newly recorded superfamily Stygothrombioidea Mullen & Vercammen-Grandjean, 1980(Acari: Stygothrombiae) from China

The paper deals with a species new to science,Stygothrombium garzensis Li&Guo,sp.nov.,collected from Qinghai-Tibet Plateau,P.R.China,which represents a newly recorded superfamily Stygothrombioidea Mullen&Vercammen-Grandjean,1980 to Chinese fauna.The new species is described and illustrated in detail,especially the quantity and characteristic of idiosomal glandularia,with the diagnosis of infracapitulum base approximately 3.5 times as long as rostrum,the second pair of posterior setae on prodorsal plate about half length of posterior portion of prodorsal plate and the second ventroglandularia between the third acetabula and inner posterior angle of the fourth coxae,located at one-third of interval near the third acetabula approximately.