Feeding on Centrosema pubescens aka Mexican butterfly-pea.
Happy to be corrected on the ID :)
On top of water
About .5cm in body length
Appendages out the back about 1cm long
Per key by Dean (1999)- horns with no spines except tubercle at base, four rows of black patches dorsally with no black midline, clear black ventral midline (some fading from preservation)
P. hypodelum per key by Webb & Suter (2011)- no gill on first ab segment, dorsal pattern, thin femora, single row of dorsal femoral spines, labrum unspined, location
Wundacaenis dostini per key of Suter (1999). Lateral projections on anterior of mesothorax distinct, non-angulate; no projections on hind coxae; longitudinal (rather than transverse) row of setae on foreleg femora
Prosopistoma pearsonorum only prosopistomatid species in Aust
Keyed per MDFRC. Only species of teloganodid in Aust.
Cloeon fluviatile per key by Webb & Suter (2011).
Bungona narilla per Webb & Suter (2011). Single gill lamella per segment, tarsal claws short and non-denticulate, labrum not deeply divided, tarsi with row of fine, long setae (latter two features not well-documented here but well observed at the time).