Identification and Ecology of Australian Freshwater Invertebrates

Major Groups \| Insecta (insects)
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5(3). Abdomen with 2 or 3 caudal filaments (CF), long or short, beaded or thin OR 3 long caudal gills (CG), flattened or saccoid OR 3 short triangular caudal processes (CP); more mature nymphs will have clearly visible wing pads (WP)

Note: Ephemeroptera:Propistomatidae:Propistoma and Plecoptera:Austroperlidae:Acruroperla atra do not have distinct caudal filaments
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Plecoptera - nymph

2 short, beaded caudal filaments

Plecoptera - nymph

2 long, thin caudal filaments

Ephemeroptera - nymph

3 long, thin caudal filaments

Odonata - nymph

3 long, flattened caudal gills

Odonata nymph

3 long, saccoid caudal gills

Odonata -larva

3 short triangular caudal processes

Ephemeroptera:Propistomatidae:
Propistoma sp.
no distinct caudal filaments

Plecoptera:Austroperlidae:
Acruroperla atra
no distinct caudal filaments

-Abdomen with 1 caudal filament OR caudal filaments, caudal gills and caudal processes absent; wing pads absent; INCLUDING animals with terminal prolegs or lobes

Note: Coleoptera:Dytiscidae larvae have 2 long caudal filaments
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