Abstract
Larvae of the antlion Callistoleon manselli New build pitfall traps that have attached radiating furrows. In order to evaluate this unique trap-building behaviour from an evolutionary viewpoint, we analysed the shape of,traps in the field, then examined the process of trap construction and the efficiency of the pitfalls in prey capture. Larvae of C manselli construct the radiating furrows after building the central pit. Larvae provided with food ad libitum tend not to construct furrows at all. Capture efficiency for the pits with furrows was greater than for pits without furrows. The pitfall traps constructed by C. manselli evidently represent a more advanced development than the simple pits of other species.
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