危害云锦杜鹃的简脉茎蜂属一新种（膜翅目：茎蜂科）及系统学意义

doi:10.11707/j.1001-7488.LYKX20210931

Abstract

Abstract:

Objective: The species of Ericaceae are important flower resources. A stem sawfly pest feeding on twigs of Rhododendron fortuneiwas found in 2021 from Ningbo, China. This study aims to clarify its species and taxonomic status, and the explore the possible bearings on the diversification mechanism of stem sawflies. Method: The classical comparative morphology was used to clarify the species name and the systematic position of the pest. The whole genome was sequenced by the second generation sequencing technique. Mitogenome was assembled and the features were analyzed, genetic distances among the relatives were calculated, and the phylogenetic trees were inferred. Result: The new species of Cephidae, damagingR. Fortunei, has been identified: Janus dujuan Wei, sp. nov.. This new species is close to J. xanthus Naito & Smith, 1998 from eastern Tibet but differs from the latter by body color and structure. The length of the mitochondrial genome of the new species is 17 725 bp and contains 37 genes. Based on the data of mitochondrial genes, phylogenetic tree of five Janus species was reconstructed. The result showed that J. dujuan formed a sister group with a species of J. bimaculatus group, and there was a significant difference between J. dujuan and the other species of Janus with known mitochondrial genome data. The K2P distance of cox1 among J. dujuan and other Janus species was between 14.7% and 21.4%. We cautiously speculate that the diversification of Janus in Southern Asia is probably related to the diversification of Ericaceae in southern China. In the contrary, the diversification of Cephus in Mediterranean region is probably related to the diversification of the Poaceae, esp. the diversification of Triticum. Conclusion: The pest boring on stems of R. fortunei is a new species: Janus dujuan Wei, sp. nov.. It is similar to J. xanthus Naito & Smith, 1998 from Tibet but differs from the latter in body color and structure. The Janus showed a relatively large genetic distance for barcoding region within the genus, suggesting more taxonomic study on Janus is required. It is speculated that its diversification in Southern Asia is probably related to the diversification of Ericaceae in southern China.

Key words: Hartigiinae, mitochondrial genome, cox1, China, Ericaceae

CLC Number:

S718.7

Gengyun Niu,Dongbin Li,Beibei Tan,Jing Xu,Meicai Wei. A New Species of Genus Janus Stephens (Hymenoptera, Cephidae) Harmful to Rhododendron fortunei and Its Systematic Significance[J]. Scientia Silvae Sinicae, 2023, 59(3): 145-151.

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References 0

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A New Species of Genus Janus Stephens (Hymenoptera, Cephidae) Harmful to Rhododendron fortunei and Its Systematic Significance

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