Guide riffle invertebrates Australian Wet Tropics streams
1709Guidetotheriffleinvertebrates
1709Guidetotheriffleinvertebrates
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7. Larval Ephemeroptera (mayfly nymphs) (based on Dean and Suter 1996)<br />
1. Nymph (larva) oval in dorsal view, upper surface strongly convex, carapace enclosing thorax and anterior<br />
segments of abdomen ................................................................................................. Prosopistomatidae (1a)<br />
1a. Prosopistomatidae<br />
carapace<br />
−<br />
Nymph not as above.........................................................................................................................................2<br />
2. Abdomen with gills on segments 1-6; operculate gills present on segment 2, covering more posterior gills<br />
................................................................................................................................................... Caenidae (2a)<br />
2a. Caenidae<br />
operculate gill<br />
− Abdomen without operculate gills; all abdominal gills exposed .....................................................................3<br />
3. Abdominal gills oval, plate-like, with tuft of filaments on lower inner margin; maxillae with four long,<br />
needle-like apical spines ................................................................................................ Ameletopsidae (3a,b)<br />
3a. Ameletopsidae: Mirawara sp. 3b. Ameletopsidae: head and thorax<br />
abdominal gill<br />
maxilla with<br />
apical spines<br />
− Abdominal gills not as above; maxilla without long apical spines ..................................................................4<br />
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