Guide riffle invertebrates Australian Wet Tropics streams
1709Guidetotheriffleinvertebrates
1709Guidetotheriffleinvertebrates
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4. Labial palps toothed distally; anal pyramid short; cerci usually at least half as long as paraprocts (4b) ...........<br />
…….. ..................................................................................................................................... Corduliidae (4a)<br />
− Labial palps not toothed distally or, if toothed, then anal pyramid long; cerci usually less than half as long as<br />
paraprocts (4c) ....................................................................................................................... Libellulidae (4d)<br />
Note: It is very difficult to distinguish between these two families.<br />
4a. Corduliidae 4b. Corduliidae: Anal pyramid 4d. Libellulidae<br />
cercus<br />
paraproct<br />
4c. Libellulidae: Anal pyramid<br />
5. Antennae 4-segmented, usually flattened; fore-tarsi 2-segmented ......................................... Gomphidae (5a)<br />
− Antennae 6 or 7-segmented, with distal segments thread like; all tarsi 3-segmented .............. Aeshnidae (5b)<br />
5a. Gomphidae 5b. Aeshnidae<br />
Gomphidae<br />
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