Golden-shouldered Backswimmer
S5, Front Legs
Ellura
Golden-shouldered Backswimmer
S2, Rear Leg Hairs
 
                      
Golden-shouldered Backswimmer (Anisops cf deanei)Class: Animals (Animalia) - Jointed Legs (Arthropoda) - Insects (Insecta)
Order: True Bugs (Hemiptera)
Family: Backswimmer (Nepomorpha: Notonectidae)     iNaturalist Observation
Species: Golden-shouldered Backswimmer (Anisops cf deanei)
This Photo:     S2, Rear Legs

Thank you Dr Matthew Pintar for confirming the id of this species for us

General Species Information:
Found on Ellura (in the Murray Mallee, SA) and elsewhere
~6mm long
It can be difficult to determine, but the back legs are covered in long hairs that look a bit like fins when they swim. They serve the same purpose.
Matthew said "Maybe but these really need closer inspection to verify"
Further we asked Matthew why we were seeing them in our area, being semi-arid and no sitting water for kms it seemed strange they'd land here. We suggested they fly high up in the rain clouds and saw our roof and interpretted as a lake. In response Matthew said "Yes, they can be attracted to the polarization of light off of flat shiny surfaces when they fly at night".
This would also explain why we found them on the newer attached shed roof, but not on the older (~7 year old) house roof.

Copyright © 2014-2024 Brett & Marie Smith. All Rights Reserved. Photographed 05-Mar-2014
This species is an Australian Native Species, not listed in the SA Murray Mallee Survey of 2010.