Coleoptera: Psephenidae (Water Penny Beetles)
- Oval, extemely dorso-ventrally (top to bottom) flattened beetle larvae.
- Mouth parts and 3 pairs of jointed legs visible only from ventral side.
- 5 pairs of finely branched gills visible on ventral side of abdomen.
- EXTREMELY RARE in Illinois.
Length: 4 mm to 40 mm
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