British insects: the families of Coleoptera
British insects: the families of Coleoptera |
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~Pythidae; including Aegialitidae, Colydiidae part, Dacoderidae, Elacatidae, Eurystethidae, Inopeplidae, Othniidae, Tenebrionidae part, Tretothoracidae.
Narrow-waisted Bark-beetles.
General appearance. 2.5–4 mm long. Body length/maximum body width 1.8–6.85. Elytral length/pronotal length 1.5–3.6. Base of prothorax not or scarcely narrower than the combined elytral bases, or distinctly 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. Body noticeably widest immediately behind the thorax. Beetles elongate-oval to elongate; not necked; conspicuously waisted. Upper surfaces of body glabrous or subglabrous, or non-glabrous; not bristly, or exhibiting stiff, erect, dark bristles; exhibiting scales or scale-like setae, or with neither scales nor scale-like setae.
Detailed morphology. Beetles equipped with a rostrum, or without a rostrum; prognathous. Eyes strongly protuberant, or not strongly protuberant; without bristles. Antennae short to about half the insect's head to tail length; 10–11 segmented. Antennal scape not swollen. Antennae filiform, or gradually expanding towards the apex. Antennal insertions visible from above, or hidden from above. Mandibular prosthecae well developed to absent. Pronotal length/maximum pronotal width 0.56–1.6. Prothorax without notopleural sutures. Metaventrite without a transverse groove. Fore coxal cavites closed behind. Hind coxae not shaped posteriorly to receive the femur. Tarsal segmentation formula 5, 5, 4. The tarsi without bilobed segments; without ‘hidden’ segments. Front tarsi with as many segments as the mid-tarsi; 5-segmented. Mid-leg tarsi 5-segmented; pentamerous, or tetramerous. The claws of the mid-leg tarsi not appendaged. The claws of the mid-leg tarsi simple, or one-toothed or bifid. Hind tarsi with as many segments as the mid-tarsi, or with one segment fewer than the mid-tarsi; 4-segmented. Elytral length/maximum width across the elytra 0.95–2.68. Elytra exposing no more than part of the terminal tergite, or at least three complete abdominal tergites; glossy. Scutellary striole present, or absent. Wings well developed, or absent or much reduced. Exposed abdominal sternites 5; all articulated and movable, or comprising both fused and movable components; immovably joined when present, 2. Abdominal segment 8 apparently without functional spiracles.
Adult habitat, ecology. Predacious, or not predacious (?); in living vegetation (in hedges, or in moss), or under bark.
Larvae. Larvae predacious, or not predacious (?); on living vegetation (in moss), or in or under bark.
Classification. Suborder Polyphaga; Infraorder Cucujiformia; Superfamily Tenebrionoidea.
Worldwide and British representation. About 300 species worldwide; genera 45. 10 species in Britain; genera in Britain 5; Lissodema, Rabocerus, Rhinosimus, Salpingus, Vincenzellus. E.g., Rabocerus foveolatus, Vincenzellus viridipennis.
General comments. Small to minute beetles, prognathous and sometimes rostrate.
Illustrations. • Rabocerus gabrieli: B. Ent. 662. • Rabocerus gabrieli: B. Ent. 662, legend+text. • Rabocerus gabrieli: B. Ent. 662, text cont.. • Lissodema, Rhinosimus, Salpingus and Vincenzellus, ,with Melandryidae and Pytho,: Fowler 5, 147 (1891). • Fowler 5, 147 (1891): original legend.. • Lissodema cursor and Rabocerus foveolatus, with unrelated taxa: Fowler Suppl. 19, 1913. • Fowler Suppl. 19, 1913: original legend.. • Rabocerus gabrieli (Janson 225). • Vincenzellus ruficollis (Rye & Fowler XI3).
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’.
