British Insects: the Families of Coleoptera
British Insects: the Families of Coleoptera |
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General appearance. 3.5–5 mm long. Body length/maximum body width 1.45–2.72. Elytral length/pronotal length 3–3.5. 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, or distinctly narrower than greatest elytral width. Beetles elongate; cylindric; not necked; somewhat waisted to conspicuously waisted; deep yellow. Upper surfaces of body non-glabrous; not bristly; with neither scales nor scale-like setae.
Detailed morphology. Beetles without a rostrum. Eyes strongly protuberant, or not strongly protuberant; without bristles; finely facetted. Antennae very short to short; 11 segmented; clubbed. Antennal clubs 3 segmented.
Pronotal length/maximum pronotal width 0.45–0.75. Prothorax with neither produced front corners nor serrated sides. Prothorax without notopleural sutures. Metaventrite without a transverse groove. The tarsi exhibiting bilobed segments; without ‘hidden’ segments (according to Imms and Lawrence et al.). Mid-leg tarsi 5-segmented; pentamerous (Lawrence et al., Imms). Claws of the mid-leg tarsi not appendaged. Front tarsi with as many segments as the mid-tarsi; 5-segmented. Hind tarsi with as many segments as the mid-tarsi; 5-segmented. Tarsal claws simple, or one-toothed or bifid. Elytral length/maximum width across the elytra 1.02–2.1. Elytra covering most of the abdomen; exposing no more than part of the terminal tergite. Scutellary striole present, or absent. Elytra non-glabrous (covered with silky hairs). Wings well developed.
Visible abdominal sternites 5–6; immovably joined 0. Abdominal segment 8 apparently without functional spiracles.
Habitat, ecology. Land-dwellers; in living vegetation (associated with flowers).
General comments. Unwin gives tarsi as “4,4,4 with some bilobed segments”.
Classification. Suborder Polyphaga; Superfamily Cucujoidea.
British representation. Genera 1; Byturus. 2 species; e.g., Byturus tomentosus.
Illustrations. • Byturus tomentosus (Janson 90).
To view the illustrations with captions giving names in current use, 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, distributions of character states within any set of taxa, source references, and other relevant material.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. British insects: the families of Coleoptera. Version: 17th June 2009. http://delta-intkey.com’.
