Insects of Britain and Ireland: the families of Hymenoptera

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L. Watson and M. J. Dallwitz

Trigonalidae

Adults small to medium sized.

Head. Antennal segments 15–25. Antennae not geniculate.

Thorax. Pronotum long, extending back to the tegulae. The spiracle cover lobe of the pronotum margined with close fine hairs. Cenchri absent. Fore-wings with a conspicuous pterostigma; with the venation well developed. Hind-wings with closed cells. Hind femur with a clear trochantellus. Hind tibiae without specialised spurs.

Abdomen. The abdomen with a marked basal constriction. The ‘waist’ simple. Ovipositor of females not visibly protruding; adapted for piercing.

Larvae. Larvae legless or the legs vestigial; parasitic on hosts selected by the mother (some primary parasites, but mostly hyper-parasites of sawflies through ichneumonid or tachinid primary parasites).

British representation. Species in Britain 1; Pseudogonalos.

Classification. Suborder Apocrita; Series Parasitica; Superfamily Trigonaloidea.


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 Hymenoptera. Version: 16th May 2016. delta-intkey.com’.

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