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Anacaena globulus · kūdravabalis
- Anacaena globula
- pyörörutavesiäinen
Most of the text below is from now defunct site www.ukbeetles.co.uk, where it was published under a CC BY 4.0 License.
This species, the type of the genus, is generally abundant throughout the UK including all the islands from lowland to all but the highest mountain altitudes, in Europe it is common from Portugal north to above the Arctic Circle in Fennoscandia and east to western Russia, the Black Sea, Turkey, Israel, Syria and various regions of Mediterranean North Africa, extending to above the tree-line to 2000 m in mountain areas. Adults occur year-round, they overwinter among marginal litter etc. and are active from early spring until late in the year, they show no particular preference for water type or habitat and have been recorded from peat cuttings and sphagnum pools, all still-water habitats, coastal pools and occasionally from seashore drift. Through the summer they are common in temporary habitats which lack vegetation such as woodland pools and tyre-ruts and we have sampled them in large numbers from cattle troughs in a range of situations, in our experience they may be more common among marginal vegetation by slow moving water and they are common locally among reed litter where the water-level fluctuates widely through the summer. Adults are readily sampled by sweeping among marginal vegetation, especially where the water is shallow, or sieving marginal litter, they are also common on floating logs and debris and, during the summer they occasionally come to light. Through the winter they often occur in numbers among extraction samples from suitable marginal habitats.
The convex form and rather abruptly yellow pronotal margins will, with a little experience, allow identification in the field.
2.7-3.5 mm. Broadly-oval and convex, more so than in our other members of the genus. Outline continuous, dorsal surface shining and not, or only very slightly, metallic, finely and rather densely punctured. Head entirely black or with diffuse pale areas before the eyes, more densely punctured than the pronotum. Eyes slightly transverse, with the anterior and posterior margins incised, weakly convex and continuous with the lateral margin. Antennae 9-segmented with a pubescent 3-segmented club; testaceous with the club dark and distinctly pubescent. Maxillary palps as long as antennae, the terminal segment a little longer than the penultimate; testaceous with the terminal segment darker. Pronotum black with rather abrupt yellow margins; transverse, broadest near the base and very finely bordered. Anterior and posterior angles rounded. Scutellum equilateral and finely punctured. Elytra broadest behind the shoulders or near middle, finely and randomly punctured and without striae but for an impressed sutural stria in the apical half; black with pale margins; the apex often extensively pale and usually with rows of black spots. Legs dark red or brown. All tibiae with several rows of strong spines and long apical spurs but without swimming hairs. First tarsal segment small so that the tarsi appear four segmented. Protarsal segments 2-4 equal, the fifth longer. Meso- and meta-tarsomeres 2 and 5 longer than 3 and 4, Claws smooth and toothed at the base. Distinct from our other species in lacking a median mesosternal ridge.
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