The annual cicadas are species that emerge every year. The unusual duration and synchronization of their emergence may reduce the number of cicadas lost to predation, both by making them a less reliably available prey (so that any predator that evolved to depend on cicadas for sustenance might starve waiting for their emergence), and by emerging in such huge numbers that they will satiate any remaining predators before losing enough of their number to threaten their survival as a species. One exclusively North American genus, Magicicada (the periodical cicadas), which spend most of their lives as underground nymphs, emerge in predictable intervals of 13 or 17 years, depending on the species and the location. Only a rare few species are known to be nocturnal. The vast majority of species are active during the day as adults, with some calling at dawn or dusk. They typically live in trees, feeding on watery sap from xylem tissue, and laying their eggs in a slit in the bark. The earliest known fossil Cicadomorpha appeared in the Upper Permian period extant species occur all around the world in temperate to tropical climates. They have an exceptionally loud song, produced in most species by the rapid buckling and unbuckling of drumlike tymbals. Cicadas have prominent eyes set wide apart, short antennae, and membranous front wings. The superfamily is divided into two families, the Tettigarctidae, with two species in Australia, and the Cicadidae, with more than 3,000 species described from around the world many species remain undescribed. They are in the suborder Auchenorrhyncha, along with smaller jumping bugs such as leafhoppers and froghoppers. The cicadas () are a superfamily, the Cicadoidea, of insects in the order Hemiptera (true bugs). una alianza para el conocimiento de la biodiversidad.Tendencias de las observaciones relativas.
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