Morphological characters of dauer juveniles of three species of Bursaphelenchus Fuchs, 1937

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The morphological characteristics of dauer juveniles were examined for Bursaphelenchus xylophilus, B. firmae and B. mucronatus kolymensis. Dauer juveniles of B. xylophilus and B. firmae were collected directly from their carrier insects, Monochamus alternatus and M. grandis, respectively. Bursaphelenchs m. kolymensis dauer juveniles were induced experimentally using M. alternatus pupae. The dauer juveniles of these three species were distinguished according to their respective body shapes. Bursaphelenchus xylophilus was relatively slender compared to the other species. The position of the excretory pore was anterior to the median bulb in B. firmae, overlapping with the median bulb in B. xylophilus, and posterior to, or overlapping with, the posterior part of the median bulb in B. m. kolymensis. The tail tip of B. firmae was conical, that of B. xylophilus contained a short projection, while in B. m. kolymensis the tail tip was blunt with a thick mucron.

Nematology

International Journal of Fundamental and Applied Nematological Research

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References

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Figures

  • Dauer juveniles of Bursaphelenchus xylophilus and B. mucronatus. A-L: Bursaphelenchus xylophilus. A: Left lateral view of anterior region; B: Left lateral view of female genital primordium; C: Right lateral view of tail; D: Ventral view of tail; E-L: Variation in tail tip; M-Q: Bursaphelenchus mucronatus. M: Right lateral view of tail; N: Ventral view of tail; O-Q: Variation in tail tip.

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  • Dauer juveniles of Bursaphelenchus firmae. A: Anterior region; B: Surface of anterior end; C: Body surface structure showing annulation and lateral field; D: Right lateral view of male genital primordium; E: Right lateral view of tail; F-M: Variation in tail tip.

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  • Dauer juveniles of Bursaphelenchus xylophilus. A-D: Left lateral view of anterior region in different focal planes (ep = excretory pore; h = hemizonid; mb = median bulb or metacorpus; n = nucleus of dorsal pharyngeal gland; nr = nerve ring; pij = pharynx-intestinal junction); E-G: Left lateral view of female genital primordia in different focal planes; H, I: Right lateral view of tail region in different focal planes (a = anal opening; rec = rectum); J-M: Variation in tail tip.

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  • Dauer juveniles of Bursaphelenchus mucronatus. A-C: Ventral view of anterior region in different focal planes (ep = excretory pore; h = hemizonid; mb = median bulb or metacorpus; nr = nerve ring; pij = pharynx-intestinal junction); D: Left lateral view of female genital primordia; E-G: Ventral view of tail region in different focal planes (a = anal opening); H, I: Right lateral view of tail region in different focal planes (a = anal opening); J-M: Variation in tail tip.

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  • Dauer juveniles of Bursaphelenchus firmae. A-E: Right lateral view of anterior region in different focal planes (ep = excretory pore; h = hemizonid; mb = median bulb or metacorpus; n = nucleus of dorsal pharyngeal gland; nr = nerve ring; pij = pharynx-intestinal junction); F: Left lateral view of male genital primordium; G: Left lateral view of lateral field; H-K: Right lateral view of tail region in different focal planes (a = anal opening; rec = rectum); L-O: Variation in tail tip.

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