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Pachydissus hector
Classification
Diagnostic Features of Larvae
- Mature larva. Length up to 45 mm; maximum breadth (at prothorax) 13 mm. Form elongate, subcylindrical, very robust. Head slightly transverse (maximum head-width 7.1 mm) with sides slightly rounded and diverging posteriorly; testaceous, shining, with genae rugose, ferruginous, temples with a transverse protuberant carina immediately behind ocelli (postocular carina), behind which they are strongly striate; dorsal boundary of antennal foramen scarcely produced, ferruginous. Frons broadly ferruginous anteriorly. Antenna with segment 3 cylindrical, elongate, about two and one-half times as long as basal width; segment 2 elongate; supplementary process conical, less than one-third length of segment 3. Mandibles robust, smooth, bearing several short setae on basal half of outer face. Labrum transversely oval, densely fringed with golden setae. Three pairs of ocelli present; subcontiguous and arranged in a straight row laterad and ventrad of antenna; lens oval, convex, sclerotized; pigmented spot indistinct. Hypostoma ferruginous, with front margin pitchy, rugose and slightly swollen at extremities; sutures pitchy, incurved; gula strongly raised. Maxilla with segment 3 conical, slightly shorter than segment 2. Pro thorax rather sparsely setose laterally; posterior part of pronotum shining and vermiculately to slightly longitudinally rugose, glabrous. Abdomen with ampullae rugose, non-tuberculate and glabrous. Anal lobes encircled by a fringe of short reddish setae, behind which are scattered, longer setae. Spiracles with about nine distinct marginal chambers.
Pupa. Length 36 mm; maximum breadth 9.5 mm. Head with vertex not visible from above; elongate, moderately rugose and glabrous. Antennae extending (in female) as far as abdominal segment 5, where they are slightly incurved ventrally to terminate near posterior tarsal claws. Eyes feebly convex, glabrous. Labrum semicircular, bearing a few scattered, minute setae. Pronotum quadrate, with sides feebly tuberculate, disc rugose, with a few scattered conical papillae (each with a subapical seta). Mesonotum transversely striate, glabrous; scutellum strongly protuberant, glabrous. Metanotum with a few papillae (each with a subapical seta) on each side of scutellar groove which is very faintly striate. Elytra and wings extending as far as abdominal segment 4. Abdomen with tergites 1-6 each with a transverse group of short, stout, ferruginous spines (each arising from a papillate base and bearing a subapical seta). Tergite 7 with a pair of small, paramedian, oval protuberances (each bearing numerous stout spines) near posterior margin. Tergite 8 bearing a few smaller spines. Tergite 9 strongly bilobed and protuberant, not concealed from above by segment 8. Sternites glabrous. Legs glabrous, with hind femora extending to abdominal segment 4. Functional spiracles present on abdominal segments 1-5; peritreme thick, narrowly oval, subreniform. Adapted from Duffy (1957).
Biology and Economic Importance
- Members of this tribe are known from various host plant families. Species of this tribe are potentially invasive outside their native range.
Selected References to Larvae Specimens
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