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www.chicagobotanic.org/plantinfo/periodical_cicada_17_year

The life cycle of cicadas is a mystery to entomologists. Periodical cicadas require either 13 or 17 years in the nymph stage, developing underground, and mature very slowly. They are synchronized to emerge en masse, every 13 or 17 years. Their 17-year life span makes them the longest-lived insect known.

www.cicadamania.com

The most well-known cicadas in North America are the Magicicada periodical cicadas, aka "locusts", which have amazingly long 17 or 13 year lifecycles. Brood VIII (17-year life cycle) will emerge in Ohio and Pennsylvania in 2019. Magicicada have been documented to emerge after 22 years. Read more: How long do cicadas live?

en.wikipedia.org/wiki/Periodical_cicadas

The 17-year periodical cicadas are distributed across the eastern, upper midwestern, and Great Plains states within the U.S., while the 13-year cicadas occur in the southern and Mississippi Valley states, but some may overlap slightly. For example, Broods IV (17-year cycle) and XIX (13-year cycle) overlap in western Missouri and eastern Oklahoma.

appalachianmagazine.com/2020/03/04/17-year-cicadas-set-to-emerge-this-year-in-virginia...

This year is Southwest Virginia and Southern West Virginia’s top broods’ turn, with outlier hatchings taking place as far south as North Carolina. The complicated life cycle of cicadas is one of mystery, fascination and intrigue: Nearly all cicadas spend years underground as juveniles, before emerging above ground for a short adult stage of ...

thehouseholdpests.org/cicada-life-cycle.html

Within 13 (a 13-year-old cicada) or 17 years (a 17-year-old cicada) in the soil, the mature nymphs emerge and climb right onto some vertical surface or nearby vegetation. After that they molt into winged adults, leaving their shed outer skins (exoskeletons) attached to twigs or tree trunks.

www.cicadamania.com/cicadas/where-will-17-13-year-periodical-cicadas-emerge-next

17 & 13 Year Periodical Cicadas 🛑 This page is strictly for Magicicada periodical cicadas, aka 17 & 13-year cicadas, aka "locusts" (read why they’re called locusts). This does not cover annual cicada species in North America and other parts of the world. 📅 Brood IX (Nine) will emerge in 2020 in North Carolina, Virginia and West Virginia.

www.msn.com/en-us/news/technology/here-they-come-17-year-cicadas-to-emerge-in...

Periodical cicadas can appear in 17 or 13-year intervals and cicadas of the same life cycle are classified into different broods. This year's emergence is classified as Brood IX and the largest ...

bgr.com/2020/04/15/science-news-cicadas-brood-ix-2020

Cicadas on a 17-year life cycle will emerge from the ground in several states this spring. After spending 17 years underground, the bugs will crawl up, perch on trees, and transition to winged adults.

en.wikipedia.org/wiki/Cicada

A 17-year cicada, Magicicada, Robert Evans Snodgrass, 1930. At least 3000 cicada species are distributed worldwide with the majority being in the tropics. Most genera are restricted to a single biogeographical region and many species have a very limited range. ... A specialist predator with a shorter life cycle of at least two years could not ...

www.pennlive.com/life/2019/04/when-and-where-in-pennsylvania-will-17-year...

Seven of them are periodical cicadas, three with a 17-year lifecycle and four with a 13-year life cycle. Periodical cicadas often are referred to as 17-year locusts.