Gleaming Tortoise Cockroach
S1, Juv, dorsal
Ellura
Gleaming Tortoise Cockroach
S3, Adult Female, profile
 
                 
Gleaming Tortoise Cockroach (Euzosteria subreflexa)Class: Animals (Animalia) - Jointed Legs (Arthropoda) - Insects (Insecta)
Order: Cockroaches (Blattodea)
Family: Cockroach (Blattidae)     iNaturalist Observation
Species: Gleaming Tortoise Cockroach (Euzosteria subreflexa)
This Photo:     🔍S3, Adult Female, dorsal🔎

Thank you Matthew Connors (Matthew_Connors) for confirming the id of this species for us

General Species Information:
Found on Ellura (in the Murray Mallee, SA) and elsewhere
The nymphs we found were ~12 & 15mm. The adult female was the chunkiest cockroach we've found at 35mm long! We have found a different cockroach that was 41mm (truely massive) but we think this one was heavier. Both were HUGE.
The surface had a metalic lusture and appeared somewhat bronze like; we had to get the lighting just right to show this in the photo's.
Notice the extensive divits in the upper shell of the pronotum, called Pronotal Sulci, which extend to the 2nd & 3rd segments.
Also notice the trailing tubercles of the pronotum, horn like.

Copyright © 2026 Brett & Marie Smith. All Rights Reserved. Photographed 14-Sep-2026
This species is an Australian Native Species, not listed in the SA Murray Mallee Survey of 2010.