Fig. 3: Sirex ovipositor: Teeth 1 to 4 point proximally (D) and are
“pull-teeth”; teeth 6, 7 and higher point distally (P) and are “push teeth”
[J. F. V. Vincent and M. J. King. The mechanism of drilling by wood wasp
ovipositors. Biomimetics, 3(4):187–201, 1995]

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