From the Super Mario Wiki
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Pit Plants are a dark green colored variety of Big Piranha Plants with spikes on their faces that live in quicksand pits in the desert. Only one Pit Plant appears, in Mario Kart: Double Dash!! in Dry Dry Desert, where it is located in the quicksand pit waiting for racers to fall in.
Due to its behavior, it may be inspired from the real-life antlion. Similarly-acting regular Piranha Plants also appear in Yoshi Desert in Mario Kart: Super Circuit, although they spit out the karts they eat.