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Sheraphelenchus sucus n. sp. (Tylenchina: Aphelenchoididae) isolated from sap flow of Quercus serrata in Japan

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A Sheraphelenchus species was isolated from a sample of sap exuding from a scar on the bark of Quercus serrata. Besides its generic characteristics, i.e., posteriorly located vulva in the female, male spicule with conspicuous dorsal limb and male tail with spike-like projection, the new species is characterised by a short stylet with a small basal swelling. The near-full-length of 18S and D2/D3 expansion segments of ribosomal RNA genes (near-full SSU and D2/D3LSU) were determined as its molecular barcode sequences and the phylogenetic status of the species (= genus Sheraphelenchus) was estimated using the near-full SSU. The molecular phylogenetic analysis revealed that the new species is included in the genus Bursaphelenchus, and is close to B. anatolius and B. kevini. Although Sheraphelenchus is phylogenetically inferred to occur within Bursaphelenchus, the new species is described herein as S. sucus n. sp., thereby retaining the genus Sheraphelenchus until additional data about morphological similarities between these two taxa are obtained.

Affiliations: 1: Forest Pathology Laboratory, Forestry and Forest Products Research Institute, Tsukuba, Ibaraki 305-8687, Japan


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