Diagnosis: Aphelenchoidinae. Male tail with thin, sclerotized
terminal extension, forming a spadelike clasping organ. Spicula usually
with prominent rostrum. Female tail conoid to blunt, rounded terminus.
Lateral fields rarely visible. Lip region set off by expansion with
well-sclerotized framework. Spear plain or with very small basal
thickenings. Median bulb ovate, with valve near center. Excretory
pore opposite base of median bulb. Hemizonid about one body width
posterior to excretory pore. Ovary outstretched, the oocytes
in single file. Spermatozoa often present in uterine tract.
Posterior uterine branch an elongated pouch in which spermatozoa are often
present. Two to four pairs of ventrosubmedian papillae usually a
prominent feature of male tail.
Type species: Bursaphelenchus piniperidae
Other species: Bursaphelenchus