Adelaide Pyrgomorph
S14, Juvi Female, profile
Adelaide Pyrgomorph
S10, Female, Fastigium
Adelaide Pyrgomorph (Monistria discrepans)Class: Animals (Animalia) - Jointed Legs (Arthropoda) - Insects (Insecta)
Order: Crickets, Grasshoppers & Katydids (Orthoptera)
Family: Gaudy Grasshopper (Caelifera: Pyrgomorphidae)     iNaturalist Observation
Species: Adelaide Pyrgomorph (Monistria discrepans)
This Photo:     🔍S16, Male, profile🔎

Thank you Matthew Connors for identifying and David Muirhead for confirming the id of this species for us

EXTRA - Photo Specific Information:
We caught this male mating with female S15. While we didn't get the photo, it allowed us to measure them. We've never seen a male on it's own, only with another female.
Notice how the pads on it's feet are so large compared to the female. One assumes to help grip when they are mating.
General Species Information:
Found on Ellura (in the Murray Mallee, SA) and elsewhere
Adult females we've measured are ~27-33mm, male ~17mm & juv' females ~16mm
While we worked out the genus years ago, Matthew id'ed them to species
He said "... Adelaide race. Oddly enough, about 1% of adults are fully-winged whereas the rest all have tiny wings like this." We've only seen flightless specimens. Later, Matthew also id'ed a couple of our juveniles as the same. We were thinking they might be Blistered Pyrgomorphs (M. pustulifera). They are quite similar and very variable. We've included shots of most speciemens to highlight differences & similarities. To help us sort them out he said "The pronotum isn't quite sculptured enough for M. pustulifera and the sides of the fastigium are convex rather than concave (although I'm not sure how variable these features are)" ... the fastigium is the spur on the top of the forehead ... "The key difference that should still be noticeable in nymphs is that the vertex (the section between the eyes) is raised above the eyes in M. pustulifera and is "flat or weakly convex" in M. discrepans." ... "I'm not sure how much the white rings vary in nymphs but in adult M. pustulifera even the ones on the side of the pronotum should have white rings". Thanks Matthew, very useful information that has allowed us to confirm all our specimens are the same species.
We photographed 17 different specimens occuring in every month over 6 months from March to August; over 9 years. We have only ever found adult males with females. Otherwise we find adult & juveniles females on their own.
Robert has since said "Some M. discrepans also seem to have white around the spots", Comparing to M. pustulifera he said "Reliable differences are; Shape of head in profile. Shape of abdomen viewed from above. Rentz et al. state that it is pinched in M. discrepans, but so far we have not seen an image where this is visible."

Copyright © 2017-2023 Brett & Marie Smith. All Rights Reserved. Photographed 12-Apr-2017
This species is an Australian Native Species, not listed in the SA Murray Mallee Survey of 2010.