Pitfall trap

Pither plant
Pitcher plants are carnivorous plants with a pitfall trap, a deep depression filled with liquid that they use to catch their prey. Pitfall traps have evolved widely as a result of epiascidiation, with selection pressure favoring more deeply cupped leaves throughout time. The pitcher trap originated in three eudicot lineages and one monocot branch separately, demonstrating convergent evolution. Some pitcher plant families (such as Nepenthaceae) are classified as clades dominated by flypaper traps, implying that some pitchers may have evolved from the common ancestors of today’s flypaper traps via mucilage loss.