Guide riffle invertebrates Australian Wet Tropics streams

2A. Mollusca: Gastropoda (snails) (based on Smith 1996, Williams 1980)
1. Shell coiled .......................................................................................................................................................2
− Shell not coiled ..........................................................................................freshwater limpets, Ancylidae (1a)
1a. Ancylidae (< 5 mm)
2. Shell with elevated spire ....................................................................................................................................3
− Shell without elevated spire, coiled in one plane ............................................................... Planorbidae (2a,b)
2a. Planorbidae: Amerianna sp.
(< 15 mm)
2b. Planorbidae: Gyraulus sp.
(< 10 mm)
3. Shell smoothly rounded without sculptured surface ...............................................................Hydrobiidae (3a)
− Shell with sculptured surface .................................................................................................... Thiaridae (3b)
3a. Hydrobiidae (< 5 mm) 3b. Thiaridae (< 20 mm)
2B. Bivalvia (mussels) (based on Smith 1996, Williams 1980)
1. Shell thin, without concentric ridges, often transparent, colourless ....................................... Sphaeriidae (1a)
− Shell not thin, with concentric ridges, often coloured .......................................................... Corbiculidae (1b)
1a. Sphaeriidae (< 10 mm) 1b. Corbiculidae (>10 mm)
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