Acacia Shield Bug
S3: Pronotum
Spined Acacia Shield Bug
Acacia Shield Bug (Alcaeus lignicolor)Class: Animals (Animalia) - Jointed Legs (Arthropoda) - Insects (Insecta)
Order: True Bugs (Hemiptera)
Family: Stink Bug (Pentatomoidea, Pentatomidae)     iNaturalist Observation
Species: Acacia Shield Bug (Alcaeus lignicolor)
This Photo:     S2: ventral

General Species Information:
Found on Ellura (in the Murray Mallee, SA) and elsewhere
~17mm long. Notice the side spines one the pronotum are very much reduced compared with A. varicornis.
It's surprisingly difficult to see, but the leading edges of the pronotum also have small spines/teeth (this occurs on both Alcaeus species we have depicted here). Note though the edges of the abdomen seem less serated compared to most pentatomids, looking almost smooth edged.
We have found 3 adults in Oct, Dec & Feb. We also found 3, what we think are nymphs, in May & June.

Copyright © 2016-2022 Brett & Marie Smith. All Rights Reserved. Photographed 06-Dec-2016
This species is an Australian Native Species, not listed in the SA Murray Mallee Survey of 2010.