British insects: the families of Coleoptera
British insects: the families of Coleoptera |
|
~Curculionidae-Platypodinae.
Pinhole Bark-borers.
General appearance. 5–8 mm long. Body length/maximum body width 2.5–4.15. Elytral length/pronotal length 1.6–2.45. Base of prothorax not or scarcely narrower than the combined elytral bases. Greatest prothoracic width not narrower or only slightly narrower than the greatest elytral width. Beetles elongate; cylindric; not necked; conspicuously waisted. Upper surfaces of body glabrous or subglabrous, or non-glabrous; not bristly; with neither scales nor scale-like setae.
Detailed morphology. Inclination of the head strong to very strong. Eyes not strongly protuberant; without bristles; finely facetted. Antennae very short; conspicuously elbowed; 6 segmented; with the scape much-elongated; clubbed. Antennal clubs 3 segmented, or 4 segmented. Antennal insertions visible from above, or hidden from above; not in fossae. Mandibular prosthecae absent. Pronotal length/maximum pronotal width 1.05–1.67. Prothorax without notopleural sutures. Metaventrite without a transverse groove. Hind coxae not shaped posteriorly to receive the femur. Tarsal segmentation formula 5, 5, 5. The tarsi without bilobed segments; without ‘hidden’ segments (the third segment not being bilobed and the fourth small but clearly visible; tarsi usually long, the basal segment longer than the others combined). Front tarsi with as many segments as the mid-tarsi; 5-segmented. Mid-leg tarsi 5-segmented; pentamerous. The claws of the mid-leg tarsi not appendaged. Hind tarsi with as many segments as the mid-tarsi; 5-segmented. Elytral length/maximum width across the elytra 1.55–2.95. Elytra exposing no more than part of the terminal tergite. Scutellary striole absent. Wings well developed. Exposed abdominal sternites 5; all articulated and movable. Abdominal segment 8 apparently without functional spiracles.
Adult habitat, ecology. In living vegetation (in oak, beech, ash).
Larvae. The larvae C-shaped, without legs, with small 1-segmented antennae.
Classification. Suborder Polyphaga; Superfamily Curculionoidea.
Worldwide and British representation. About 1000 species worldwide (mostly tropical). 2 species in Britain; genera in Britain 1; Platypus. E.g., P. cylindrus (Cylindric Ambrosia Beetle).
General comments. Adults with more or less circular eyes, and the abdomen longer than the metathorax..
Illustrations. • Platypus cylindrus (Cylindric Ambrosia-beetle: bent051). • Platypus cylindrus (details, B. Ent. 051). • Platypus cylindrus: B. Ent. 051, legend+text. • Platypus cylindrus: B. Ent. 051, text cont..
To view the illustrations with detailed captions, go to the interactive key. This also offers full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. British insects: the families of Coleoptera. Version: 2nd January 2012. http://delta-intkey.com’.
