Small Zebra Spider Wasp
S1, Female, profile
Ellura
Small Zebra Spider Wasp
S1, Female, Wing Venation
 
                      
Small Zebra Spider Wasp (Ctenostegus sp)Class: Animals (Animalia) - Jointed Legs (Arthropoda) - Insects (Insecta)
Order: Ant Bee Wasps (Hymenoptera)
Family: Zebra Spider Wasp (Wasp: Pompilidae: Pompilinae)     iNaturalist Observation
Species: Small Zebra Spider Wasp (Ctenostegus sp)
This Photo:     🔍S3, Male, profile🔎

Thank you Dr Paul Whitington for confirming the id of this species for us

General Species Information:
Found on Ellura (in the Murray Mallee, SA) and elsewhere
See the other Zebra Spider Wasp (Pompilinae sp) for a discussion of variations in this sub-family.
S1 was ~9mm long (body & head), wingspan ~15mm. S2 was slightly larger ~10.5, while S3 was smaller again ~9mm. Significantly smaller than the Turneromyia sp we found.
Note the stripes are less distinct, more grey that silvery white.
We cannot be sure but S3 has quite a different abdomen shape to S1 & S2, as well as proportionally thicker antennae. As such, we suspec S1 & S2 are female, while S3 is a male.
Also note the 2 sub-marginal cells on the wing venation; diagnostic for this genus.
Paul said "Wing venation is a match to figs.2-12 in Evans, H.E. "A revision of spider wasps of the genus Ctenostegus" Aust.J.Zool. Suppl.Ser. 1976, 43: 1-107. In his paper "A revision of spider wasps of the genus Turneromyia" Aust.J.Zool. Suppl.Ser. 1984, 101: 1-59, Evans states that the distinguishing feature to the closely related pompilid species Turneromyia is the presence of 3 submarginal cells in the forewing of Turneromyia vs. 2 submarginal cells in Ctenostegus."

Similar Species: Large Zebra Spider Wasp (Turneromyia sp)

Copyright © 2020-2023 Brett & Marie Smith. All Rights Reserved. Photographed 30-Oct-2020
This species is an Australian Native Species, not listed in the SA Murray Mallee Survey of 2010.