Magicicada tredecim

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I5klogo4.jpg Magicicada tredecim

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i5K Comments for Magicicada tredecim
Periodical cicadas have the longest life cycle from egg to adult of any insect and appear synchronously and periodically. They are probably the most unusual agricultural pest in that in any given orchard, adults appear only once every 13- or 17-years; however nearly every year periodical cicadas appear somewhere in the eastern US. Although infrequent in any one location, the effects are devastating. Female oviposition scars cause fruit laden branches to break off and millions of periodical cicada nymphs underground have been shown to cause orchard decline. In addition to their agricultural interest, periodical cicadas are of ecological and evolutionary biological interest. The cicadas themselves have quite large genomes (6500-6600 Mb recently estimated by Spencer Johnston & Shawn Hanrahan), but their obligate endosymbionts have the smallest genomes known (144kb). Periodical cicadas are known to be major players in nutrient cycling in forest ecosystems and their unusual life cycles cries out for molecular study. The genetic basis of their extraordinary molecular clock and of their 13- versus 17-year life-cycle difference is completely unknown. Even stranger is the fact that these cicadas are known to switch between life cycles via 4-year jumps. This has happened at least three times in the last million years resulting in speciation due to allochrony. We suggest sequencing a 13-year cicada (Magicicada tredecim) because this life cycle is hypothesized to be the ancestral condition but if there is space, it would be really fascinating to sequence both a 13-year (Magicicada tredecim) and a 17-year cicada (Magicicada septendecim). We have plenty of fresh frozen tissue; these insects are large and we can easily get more than 10 ug of DNA from a single individual thorax (so as to rule out sperm or endosymbionts). Chris Simon

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Magicicada tredecim
13-year cicada


Taxonomic classification
Class: Insecta
Order: Hemiptera
Family: Cicadidae
Genus: Magicicada
NCBI taxid: 485px-US-NLM-NCBI-Logo.png 52805
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Information
Nomination: i5K initiative
Date: 2011/08/05


I5klogo4.jpg  i5K Arthropod Sequencing Initiative
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