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Wharf Borer

Scientific Name
Nacerdes melanura
Scientific Author
(Linnaeus, 1758)
(Coleoptera: Oedemeridae: Nacerdinae: Nacerdini)
Pest Status
0 Unknown
NZ - Exotic

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Diagnostic Images

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Diagnostic Images (6)
Other Images (3)
Diagnostic Notes

Male. Length 9.4-11.3 mm. Head testaceous to brown, elongate; terminal segment of maxillary palpi subtriangular with single small convex incision slanting across apex and small indentation on outer, anterior margin. Ultimate segment of antennae small, not constricted across middle. Prothorax testaceous, narrowed below middle, posterior margin faintly sinuate; both head and prothorax sparsely clothed in appressed golden hairs. Elytra testaceous, apices fuscous, covering abdomen, hind wings fully developed. Fore and mid femora slightly swollen, fuscous, tibiae testaceous to brown, slender, straight. Seventh sternite deeply and acutely cleft, lobes rounded apically, petal-shaped, haired; eighth sternite bilobed, lobes may be contiguous basad, hollow, scoop-shaped, rounded apically, densely haired, widely joined as base. Ninth sternite Y-shaped, consisting of two narrow rods joined at base and touching for half their length, with three recurved flanged hooks at each apex. Tegminite broad, apex narrowed, tip rounded, sparsely haired.


Length 9.8-13.5 mm. Very similar to male; ultimate segment of antennae constricted about middle; with slender fore and mid femora. Eighth sternite subquadrate, with small paired knobs on lateral margins about midway, sclerotized plates wide apart; prominent styli on coxites.


Family diagnosis. Subcylindrical, thorax relatively short; lightly pigmented except mouthparts, sometimes urogomphi. Head with epicranial stem moderately to very long, endocarina beneath it; frontal arms usually V-shaped, frontoclypeal suture sometimes present. Antennae usually long, 3-segmented; segment 3 reduced. Ocelli usually absent, sometimes 5 on each side. Mandibles with mola transversely ridged. Maxillae with mala broadly to narrowly rounded, sometimes cleft; small uncus usually subapical. Hypopharyngeal sclerome present. Hypostomal rods absent, gula absent. Thorax usually with patches of asperities on all terga, sometimes absent or only on meso- and metatergum. Legs with patches of short spines or asperities; coxae moderately to widely separated; tarsunguli long, curved, bisetose, setae closely set. Abdomen with tergites 1 and 2, 1 to 3, or sometimes 1 to 5, and sternites 2 to 4, or 3 to 4 bearing ampullae with asperities, rarely absent; tergite 9 usually without urogomphi or with very short pair, sometimes these well developed, upturned with posterior pit between them; sternite 9 usually simple, sometimes with 3 to 4 basal asperities on each side; segment 10 transverse, posteroventral, or more or less terminal. Spiracles annular.


- Booth, R.G., Cox, M.L. & Madge, R.B. (1990). IIE guides to insects of importance to man. 3. Coleoptera. International Institute of Entomology. University Press, Cambridge, UK, 384 pp.

- Hudson, L. (1975). A systematic revision of the New Zealand Oedemeridae (Coleoptera, Insecta). Journal of the Royal Society of New Zealand, 5(3): 227-274.
More Information
Specimen Contact
MAF Plant Health & Environment Laboratory
MAF Plant Health & Environment Laboratory
28/01/2011 11:26 AEST
Last Updated
14/04/2014 23:54 AEST
MAF Plant Health & Environment Laboratory (2011) Wharf Borer (Nacerdes melanura) Updated on 4/14/2014 11:54:38 PM Available online: PaDIL -
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