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Phymatodes alni
Classification
Diagnostic Features of Larvae
- Mature larva. Very similar to that of Phymatodes testaceus, from which it may be distinguished as follows. Length up to 7 mm; maximum breadth (at prothorax) 3 mm. Head with gena testaceous, this area not enclosing ocellus. Ocellus with lens rather large, oval, scarcely convex; pigmented spot deep beneath cuticle, usually very indistinct. Mouthframe smooth, pale, testaceous. Antenna with second segment not or scarcely longer than broad. Maxilla with third segment of palp twice as long as second. Front margin of hypostoma pale testaceous; sutures indistinct. Legs extremely minute (not visible with a 15X lens) and apparently absent in some specimens.
Pupa. This species differs from that of Phymatodes testaceus as follows. Length 4-7 mm; maximum breadth 2.25 mm. Head with antennae not curved downward alongside mid femora, but continuing posteriorly as far as mid femora where they are slightly curved to terminate near apices of elytra. Maxillary palpi entirely cylindrical, not enlarged at apex. Pronotum without a conspicuous cone-shaped tubercle, but with front margin very slightly raised medially. Abdomen with tergites one to six, each with paired groups of two to three small spines near posterior margin; anterior half of tergites glabrous. Seventh tergite with a single row of spines near posterior margin. Functional spiracles with peritreme rather narrowly oval. Adapted from Duffy 1953).
Biology and Economic Importance
- Members of this tribe are known from various host plant families and several species are considered economically important. Species of this tribe are potentially invasive outside their native range.
Selected References to Larvae Specimens
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