Ischnomera cyanea (Fabricius, 1793)        Notable B
This would seem to be the most frequently recorded and widespread member of the genus; there are modern records throughout southern England and Wales west to Devon and north to Nottinghamshire and a couple of isolated records from north Yorkshire. Vasquez-Albalate (2003) quotes cyanea as the commonest species in Great Britain and central Europe. Adults have been recorded from Acer, Crataegus and Salix, and from the flowers of Sorbus and various umbels. Larvae develop in reasonably soft rotting wood of a range of broadleaved trees, they have been recorded from Acer, Castanea, Fagus, Fraxinus, Populus, Prunus, Quercus, Salix and Ulmus. We have not yet recorded the species from our Watford area although it was locally common to the south of us around Uxbridge during the 1970's and 1980's. The specimen featured is from Brockenhurst, Hants, swept from cow parsley (June, 2006) and we have taken the opportunity to feature it.

6-9.5mm (Vasquez-Albalate, 2003) A narrow and elongate species with proportionally long elytra, Head, thorax and elytra brilliant metallic green appearing blue at some angles. Appendages black with a metallic green reflection. Head with fine punturation which is denser laterally and basally, pubescence pale and recumbent, in our specimen directed towards centre of vertex. Front margin of clypeus brown, clypeus and labrum produced forward. Front margin of eyes weakly emarginate but not encompassing antennal insertions. Antennae 11 segmented in both sexes, inserted in front of eyes. Ventral surface of segments 1 and 2 brown, segment 3 about twice as long as 2. Last segment of palps characteristic, furrowed on apical inner margin. Pronotum widest before middle, constricted to front and hind margins which are finely bordered, surface with three large and shallow depressions; on either side of middle and one in front of base. Densely punctate, more so laterally, and with recumbent pale pubescence which is mostly directed laterally. Elytra broadest behind middle and with well developed shoulders, side margins almost straight to rounded apex. Each with five raised longitudinal lines (including sutural border), three of which are visible from above, almost to apex. Surface densely and rugosely punctate. Pubescence short and very fine, mostly directed backwards, that between suture and first raised line directed backward or slightly obliquely towards the lateral margins , this is diagnostic in I.cinarescens (Pandelle) this pubescence is longer, more conspicuous and directed laterally at 45. Legs long and slender, entirely finely pubescent. Each tibia with two fine spurs at apex. Tarsi 5-5-4, penultimate segment deeply bilobed. Claws weakly toothed at base, this is diagnostic; in I.caerulea (L.) they are much more strongly toothed at base.

This can be difficult to appreciate, try lighting the specimen from the side and looking at the shaded surface.

Description from 1 specimen at X20

References
Vazquez-Albalte, 2003. European fauna of Oedemeridae. Argania.

I.cyanea Claw

I.caerulea Claw

Home