subfamily Polycestinae » tribe Astraeini » subtribe Astraeina
Astraeus subgenus: Depollus
Astraeus irregularis Adult images
10.5 – 10.8
| n = 3||12.4|| n = 1|
10.25 – 10.5
| n = 2||12.2|| n = 1|
4 – 4.1
| n = 3||4.8|| n = 1|
|Legend ||L1||length from clypeus/frons to elytral apex (mean, range, sample size)|
|L2||length from anterior of edge of eyes to elytral apex|
|W||maximum width with elytra fully closed|
Astraeus irregularis Distinctive features
A highly variable configuration of yellowish lacunae on a on a blackish background.
A widespread species on foliage of Casuarinas. Well known in WA and first reported for SA by Barker 1977 from east of Kimba, Eyre Peninsula, where there is a localised patch of the shrubby Allocasuarina helmsii. Hawkeswood & Peterson 1982 pointed to the earlier report from Victoria by Goudie 1920, and the species was later recorded in Queensland by (Barker 1989).
Recent records presented here show Astraeus irregularis to be more common in SA than previously thought, being found here also on Allocasuarina muelleriana (Slaty Oakbush), a common and widespread shrub of mallee heath vegetation on sandy soils and dune crests of Eyre Peninsula and the Murray Region.
Beetles often sit on upper stems within the canopy where they are well camouflaged amongst the dappled shadows, but they are shy and readily drop when approached.
Australian States: WA, SA, VIC, QLD
Southern South Australia distribution
|Legend||P.J.Lang collection vouchered records|
|other private collection or museum specimens, or sightings|
Adult activity records for Astraeus irregularis (total of 44 beetles)
|Legend||live emerged adults, count > median value of 18 per quarter month|
|live emerged adults, count <= median value of 18|
|live non-emerged adults only, for that quarter month|
|number of active beetles for that quarter month|
Adult host plants
|Allocasuarina muelleriana ssp. muelleriana||32||3||EP, MU||C||
|Legend||beetles||count of beetles collected from, or sighted on, host plant taxon|
|sites||count of major sites (unique 10 km grid cells +/- some distinct approximate localities)|
Position on adult host
|on foliage or non-flowering plant||39||4|
|on plant (unspecified)||5||2|
Host plant notes
In SA, Astraeus irregularis has only been recorded in the foliage of two shrubby Casuarina species, Allocasuarina helmsii and A. muelleriana. These are most likely its larval hosts also. Goudie 1920 reported: 'One of my specimens was taken (at Birchip) in its tunnel in a branch of the 'bull-oak,' Casuarina luehmanni [= Allocasuarina luehmannii]. Two others were taken on the foliage of the same tree at Green Lake, near Sea Lake, 21/1/16.'
|¹ Legend||regions||SA State Herbarium regions (map)|
EA: Eastern, EP: Eyre Peninsula, FR: Flinders Ranges, GT: Gairdner-Torrens, KI: Kangaroo Island, LE: Lake Eyre, MU: Murray, NL: Northern Lofty, NU: Nullarbor, NW: North-Western, SE: South-Eastern, SL: Southern Lofty, YP: Yorke Peninsula
|size||The ellipse is the correct size when printed, indicative on a desktop screen, and likely to be wrong on a mobile device.|