Key to Help Screen Tomicus piniperda (L.)
From Other North American Scolytidae (Coleoptera)
From: Cavey, J., Passoa, S. and Kucera D. 1994, Screening Aids for Exotic Bark Beetles in the Northeastern United States. NA-TP-11-94. Northeastern Area: U.S. Department of Agriculture, Forest Service.
For more information on Tomicus piniperda (L.) - USDA Forest Service Pest Alert
The following key was designed so that entomologists with little taxonomic experience in bark beetles (Scolytidae) could recognize T. piniperda. Help notes and a glossary follow the key. Although this will produce accurate identifications, it should be emphasized that all T. piniperda determinations need to be confirmed by a specialist. Such caution is important because the ever changing Nearctic scolytid fauna may someday include genera which resemble T. piniperda.
Key prepared by
Help notes to Tomicus piniperda key
It is usually necessary to rotate the specimen in order to search for the smooth area. Evaluating the declivity is a difficult character for the non-specialist; it may be necessary to examine a reference specimen of T. piniperda first for practice.
Some females of T. piniperda (5-10%) have a more continuous second row of setae on the declivity and might consequently key incorrectly in couplet 5 (S.L. Wood, pers. comm.). Any scolytids that key past couplet 4 in this key should be considered as suspect exotic species.
Description of T. piniperda adult:
Armed elytra: elytra that have a series of raised semicircular projections (Figure 1).
Asperate pronotum: a pronotum roughened with blunt or pointed grainlike elevations.
Club: enlarged apical segments of the antenna (segments 8-11 on T. piniperda).
Declivity: the portion of the elytra that slopes downward at the rear end of the beetle above the anus.
Elytra: the hardened front wing covers of beetles.
Funicle: that portion of the antenna between the scape and the club (segments 2-7 in T. piniperda).
Scape: the elongate first segment of the antenna.
Setiferous punctures: a pit in the cuticle (skin) with a hair in the center.
Non-target information which may help future survey efforts.
We thank the following people for their advice in constructing this technical note.
Don Anderson and Natalia Vandenberg, USDA/ARS/SEL
The support of the USDA/APHIS/PPQ Northeastern Region and use of the scanning electron microscope and insect collection at Ohio State University are also appreciated.
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