Abstract
Based on the original research of 2017–2018, also reference data, four aphid species and five species complexes of the family Adelgidae listed for Lithuanian fauna. Pineus (Pineus) strobi (Hartig, 1839) is a new species for the fauna of Lithuania. Summarized information on the distribution and host specificity of adelgid species in Lithuania is presented. The most common species recorded from all geographical regions of Lithuania were the ones belonging to the species complexes Adelges laricis – A. tardus, Pineus orientalis – P. pini, Sacchiphantes viridis – S. abietis and Gilletteella cooleyi – G. coweni. Six species of Adelgidae inhabit host plants of the genus Picea, three live on Larix, three – on Pinus, two – on Abies, one – on Pseudotsuga. Partial sequences of mitochondrial (COI) and nuclear (EF-1α) DNA of Lithuanian samples were analysed in comparison with available data from GeneBank representing samples from Central Europe. Pairwise distances of COI and EF-1α fragments between samples belonging to species complexes Adelges laricis – A. tardus, Dreyfusia nordmannianae – D. piceae, Sacchiphantes viridis – S. abietis, Gilletteella cooleyi – G. coweni and Pineus orientalis – P. pini suggest each species complex being a single species.
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