Guide riffle invertebrates Australian Wet Tropics streams
1709Guidetotheriffleinvertebrates
1709Guidetotheriffleinvertebrates
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5. Larval Odonata (damselflies and dragonflies) (based on CSIRO 1991)<br />
1. Body usually slender, bearing three leaf-like or sac-like tracheal gills attached to tip of abdomen (see 2a,b) ..<br />
………………………………………………………………………………………..suborder Zygoptera …2<br />
− Body usually stout, without external tracheal gills, but with three conspicuous substantial spine-like or<br />
triangular processes at tip of abdomen, forming anal ‘pyramid’ surrounding anus (see 4a,b) ..........................<br />
………………………………………………………………………………………suborder Anisoptera …3<br />
2. Caudal gills sac-like ..................................................................................................... Amphipterygidae (2a)<br />
− Caudal gills flattened, leaf-like ............................................................................................... Synlestidae (2b)<br />
2a. Amphypterygidae 2b. Synlestidae<br />
sac-like gills<br />
leaf-like gills<br />
3. Labium deeply concave, ladle-shaped; labial palps broadened (3c), forming mask in front of head when<br />
closed (3a, 3b); prementum bearing large setae ...............................................................................................4<br />
3a. Concave labium retracted 3b. Labium extended 3c. Concave labium<br />
labial palp<br />
prementum<br />
bearing setae<br />
−<br />
Labium flat, lying beneath head when closed (3d, 3e); labial palps not broadened (3f); prementum without<br />
setae .................................................................................................................................................................5<br />
3d. Flat labium retracted 3e. Labium extended 3f. Flat labium<br />
labial palp<br />
prementum<br />
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