A clarifying study on the valid name of Genus Cyllorhynchites Voss (Coleoptera: Rhynchitidae) and the identification of its common species in China
Genus Cyllorhynchites Voss,branch-cutting weevil,belongs to the tribe Rhynchitini (Rhynchitidae:Rhynchitinae).However,this genus was often treated as Mecorhis Voss or Mechoris in the same tribe by mistake,and its common species such as Cyllorhynchites cumulatus Voss and C.ursulus Roelofs are also confused due to uncorrected genus name.By checking published records and collecting specimens from different regions in China,we aimed to clarify its valid generic name of branch-cutting weevil and provide additional data about morphological and ecological characteristics for the identification of these two common species.Our results showed that:(1) The branch-cutting weevil belongs to Cyllorhynchites,rather than Mecorhis Billberg or Mechoris.The Chinese names of Cyllorhynchites cumulatus and Cyllorhynchites ursulus were named after their key host plants.(2) For C.cumulates,adult body blackish-blue,white short pubescences are sparse so that striae are obvious.The length of larvae is about 6.0-9.0 mm,antennal sensorium long lanciform.There are 2 setae,fs4 (frontal seta 4),fs5,respectively,on the dorsum of frons.No seta on the dorsum of epicranium.Labrumand clypeus narrow.The species distributes in southern regions of Yellow River in China,host plants belonging to Castanea species.In the Jinzhai County of Anhui Province,the emergence period of C.cumulates adults is from late May to late June,then adults begin to mate and lay eggs just after emergence.C.cumulates females lay eggs and cut branches during June and early July.For C.ursulus,adult body blackish-brown and all legs brown,yellow short pubescences are dense so that striae are not obvious.The length of larvae is 8.0-10.0 mm,antennal sensorium longconical.There is only 1 seta,fs5,on the dorsum of frons.Only 1 seta,des5 (dorsoepicraneal 5),on the dorsum of epicranium.Labrumand clypeus broad.The species distributes in most regions of China,host plants from Quercus and Cyclobalanopsis.In the Dujiangyan City of Sichuan Province,the emergence period of C.ursulus is from June to July.C.ursulus females lay eggs and cut branches during middle August and late September because they need undergo longer feeding period before egg laying due to delayed development of acorns.In this study,We illustrate the affiliation of the genus Cyllorhynchites on taxonomy and provide new data for the identification of the two common species.
CyllorhynchitesCyllorhynchites cumulatusCyllorhynchites ursuluslarvamorphologyhost plantslife historygeographical distribution
NETL
NSTL
万方数据
维普
