Insects of Britain and Ireland: the families of Hemiptera

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L. Watson and M. J. Dallwitz

Issidae

Salient features of adults. Terrestrial.

Phytophagous (? - often on oak, whitebeam and ivy). Small; 5.5–7 mm long; fliers, or non-fliers; relatively stout bodied. Rostrum not separated from the prosternum by a gula. Antennae from the lower part of the head; longer than the head, readily visible from above; consisting of short segments with a terminal, unsegmented arista that is much longer than the segments. Ocelli absent. Tegulae present. Fore-wings well developed to vestigial or absent; in the resting insect sloping roof-like over the abdomen; more or less uniform in texture; with opaque cells; when macropterous, without costal fracture and cuneus; with a clavus; with conspicuously raised, reticulate venation. Clavus with two veins uniting posteriorly to form a Y. Hind coxae immobile. Tarsi 3 segmented.

Costa of the fore-wings bulging out in the proximal third, lending the bug a 'broad-shouldered' appearance; fore-wings distally with numerous, conspicuous cross-veins; dorsal surface without the pitting characterising Tettigometridae, and the head and scutellum keeled.

Taxonomy. Suborder Homoptera. Auchenorrhyncha. Fulgoroidea.

British representation. 1 species in Britain; genera 1. Issus. E.g., I. coleoptatus (Variegated Issus).

Illustrations. • Issus coleoptratus (Variegated Issus: B. Ent. 449). • Issus coleoptratus (detail: B. Ent. 449). • Issus coleoptratus (dissections: B. Ent. 449). • Issus coleoptratus (legend+text: B. Ent. 449). • Issus coleoptratus (text: B. Ent. 449, cont.). • Issus coleoptratus, with Cicadidae, Membracidae and Tettigometridae: Edwards.


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. Insects of Britain and Ireland: the families of Hemiptera. Version: 16th May 2016. delta-intkey.com’.

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