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Phytoecia cylindrica
Classification
Diagnostic Features of Larvae
- Mature larva. Form elongate, slender, cylindrical. Length up to 20 mm; maximum breadth (at prothorax), 2 mm. Head thick, subovate in cross-section, widest across posterior limit of frons, with sides strongly converging posteriorly; antennal foramen closed behind; mouthframe rather feebly sclerotized; frons with a transverse row of eight (?) setae; six epistomal setae present. One pair of ocelli present; lens small, slightly protuberant; pigmented spot rather indistinct. Mandible short, less than twice as long as basal width. Clypeus glabrous. Hypostoma smooth, testaceous, with a transverse row of setae; sutures slightly curved, ferruginous. Gula indiscernible. Labrum transversely oval. Antenna two-segmented; second segment bearing a slender, strongly tapering, hyaline process. Maxilla with a three-segmented palp; third segment slightly longer than second; lobe short and stout. Labial palp with third segment conical, slightly longer than second. Mentum setose, distinct from submentum. Prothorax obliquely slanting, with sides diverging posteriorly; anterior part of pronotum with scattered fine setae; posterior half with asperities which increase in size towards base; sublateral impression linear, straight, long, and brownish. Presternum setose; eusternum distinct, setose. Abdomen sparsely setose; each dorsal ampulla very strongly protuberant, bilobed (as in Obrium), with a single deep transverse furrow, glabrous, non-tuberculate and microscopically reticulate. Ninth segment simple, sparsely setose. Tenth segment stout, protuberant, trilobate, setose. Epipleurum protuberant on all segments. Pleural tubercle with two setae but no sclerotized pits. Legs absent. Spiracles with peritreme thick and very narrowly oval.
Pupa. Length, 8-11 mm; maximum breadth, 2.25 mm. Head entirely visible from above, feebly excavated, and with three to four fine setae opposite base of each antenna; front with three to four setae near mesal margin of each eye; clypeus with a transverse impression and about six setae across base. Antennae extending as far as first abdominal segment where they are strongly curved downward to terminate alongside maxillary palpi. Eyes moderately convex, glabrous. Mandibles with two short setae near middle of outer face. Labrum triangular, glabrous. Pronotum bearing several scattered fine setae, especially along front and lateral margins. Mesonotum smooth and usually bearing two to four setae; scutellum scarcely protuberant, glabrous. Metanotum smooth, and with two to three fine setae on each side of scutellar groove, which is narrow and very distinct. Elytra and wings extending to fourth abdominal segment. Abdomen with tergites one to seven with strongly protuberant bilobed ampullae, which bear several short straight spines (each arising from a papillate base), some of which are inclined anteriorly. Seventh tergite elongate. Eighth tergite rather short, transverse and with a row of similar spines near base. Ninth tergite very short, the posterior margin bearing several similar but slightly stouter spines. Sternites four to seven with ampullae, each bearing a minute seta. Pleura moderately protuberant on segments five to eight and each with two or three short spines. Legs with hind femora extending to fourth abdominal segment; tibiae directed posteriorly. Functional spiracles present on first seven abdominal segments, and a vestigial pair present on segment eight; peritreme rather narrowly oval, moderately thick, surrounded by a tubercular rim, and raised above general level of cuticle. Adapted from Duffy (1953).
Biology and Economic Importance
- Biology unknown for members of this tribe. Species of this tribe are potentially invasive outside their native range.
Selected References to Larvae Specimens
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