| CPIE Project | Page A10 |
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BEETLES Order Coleoptera. When completed, the following key will cover both adult and immature stages. Adult aquatic beetles are air-breathing. The dytiscid pictured here is obtaining air through the posterior tip of its abdomen, which is seen just breaking the surface as the animal hangs head down in the water. The hind legs are adapted for swimming: more or less flattened and heavily fringed with hairs.
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| 131a | Antennae long and filiform (narrow, filament-like); maxillary palps short. In the water, frequently seen hanging head downward at the surface, or swimming by moving both hind legs together ~ Family DYTISCIDAE |
[132] | ||
| 131b | Antennae short and club-shaped; maxillary palps as long or longer than the antennae. In the water air carried in a film on the ventral surface; swimming by moving hind legs alternately ~ Family HYDROPHILIDAE |
[134] | ||
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| 132a | Adult beetle about 1 cm long or slightly more. Males (only) with as many as 30 sucker discs on the underside of fore and middle tarsi Rhantus pacificus
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| 132b | Adults smaller, less than 0.5 cm long and closer to 0.25 cm. Males with far fewer sucker discs on tarsi | [133] | ||
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| © 2000 AECOS, Inc. [FILE: invert8.html] | Arthropods, Insects |
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