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Parapiesma quadratum
Family: Piesmidae

This species is distinguished from Piesma maculatum by the shape of the pronotum, which lacks clearly indented side margins. 

Found widely throughout the UK, although local inland and mainly associated with coastal saltmarshes, this bug feeds mainly on oraches and sea purslane.
Adults overwinter, mating in the spring and producing several generations per year.

Compare:
Piesma maculatum

Adult: All year
Length 3.0-3.5 mm
 
Parapiesma quadratum
Adult: north Wales (July 2008) ©Joe Botting

Parapiesma quadratum Parapiesma quadratum
Adult: north Wales (May 2009) ©Tristan Bantock

Adult: Dorset (April 2009) ©Mark Dunkling
Parapiesma quadratum Parapiesma quadratum nymph
Adult: Essex (July 2009) ©Tristan Bantock

Nymph: Essex (July 2009) ©Tristan Bantock