Three new species of parasitaphelenchids, Parasitaphelenchus frontalis n. sp., P. costati n. sp. and Bursaphelenchus hirsutae n. sp. (Nematoda: Aphelenchoididae), isolated from bark beetles from Japan

摘要

Three parasitaphelenchid species, Parasitaphelenchus frontalis n. sp., P. costati n. sp. and Bursaphelenchus hirsutae n. sp., are described. Parasitaphelenchus frontalis n. sp. was isolated from the body cavity of Scolytus frontalis emerging from dead logs of Zelkova serrata collected from Kanagawa, Japan, and characterised by its four-lined lateral field in the adults and dome-shaped lip region of the parasitic juveniles. Whereas the two first-mentioned species were isolated from Alniphagus costatus, B. hirsutae n. sp. emerged from dead logs of Alnus hirsuta collected from Nagano, Japan. Parasitaphelenchus costati n. sp. and B. hirsutae n. sp. were recovered from the body cavity and the underside of the elytra of their host/carrier beetle, respectively. Parasitaphelenchus costati n. sp. is characterised by its three-lined lateral field in adults and the presence of a ventrally-directed hook on the lip region of the parasitic juvenile. Bursaphelenchus hirsutae n. sp. belongs to the eggersi group of the genus and is characterised by its three-lined lateral field, dorsally truncate condylus and pointed rostrum of males, and long, smoothly tapering and strongly ventrally recurved, female tail. Molecular characterisation is provided for all three new species and their phylogenys discussed.