Priocnemis susterai

Priocnemis susterai is a large species of pepsine spider wasp and is, with Priocnemis perturbator and Priocnemis coriacea, one of three similar species of the subgenus Umbripennis found in Great Britain. All three of these species are characterised by having plentiful erect hair on the face and propodum.

Priocnemis susterai
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Pompilidae
Genus:	Priocnemis
Species:	P. susterai
Binomial name
Priocnemis susterai Haupt, 1927
Synonyms
Priocnemis clementi Priocnemis gasconia

Distribution

P. susterai is widespread in central and southern Europe but is difficult to distinguish from the more common P. perturbator. In Great Britain, it is widely distributed in southern and central England as far north as north-east Yorkshire and westwards to Wales and Cornwall.

Habitat

This species can be found in open woodland with dry soils, and avoids waterlogged areas.

Biology

In Great Britain the flight period is April to August, and the species overwinters as an adult. Due to confusion with P. perturbator, prey records of the two species (formerly considered a single species P. fuscus) are not reliable. However, it is probable that P. susterai preys on larger spiders of the families Lycosidae and Gnaphosidae. Although little is known about the nesting biology of P. susterai, like other Priocnemis wasps it probably excavates cells in pre-existing cavities. Like P. coriacea, the only flower it has been recorded nectaring at is wood spurge but it probably nectars at similar flowers with open corollas.