Magicicada cassinii

Magicicada cassinii,[lower-alpha 1] sometimes called the 17-year cicada, Cassin's periodical cicada or the dwarf periodical cicada,[8] is a species of periodical cicada. It is endemic to the United States. It has a 17-year lifecycle but is otherwise indistinguishable from the 13-year periodical cicada Magicicada tredecassini. The two species are usually discussed together as "cassini periodical cicadas" or "cassini-type periodical cicadas." Unlike other periodical cicadas, cassini-type males may synchronize their courting behavior so that tens of thousands of males sing and fly in unison.[9][10] The specific name cassinii was in honour of John Cassin, an American ornithologist.

Magicicada cassinii
A Magicicada cassinii female ovipositing

Near Threatened  (IUCN 2.3)
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Hemiptera
Suborder:
Auchenorrhyncha
Infraorder:
Cicadomorpha
Superfamily:
Cicadoidea
Family:
Cicadidae
Subfamily:
Cicadettinae
Tribe:
Lamotialnini
Genus:
Magicicada
Species:
M. cassinii
Binomial name
Magicicada cassinii
(Fisher, 1852)
Main article: Cassini periodical cicadas

Description

The adult Magicicada cassinii is very similar in appearance to other periodical cicadas. It is between 24 and 27 mm (0.94 and 1.06 in) long, measured from the front of the head to the tip of the wings folded over the abdomen. The head is black, the eyes are large and red, the pronotum is black apart from a narrow orange band at the edge of the sternites, and the abdomen is black. The legs are orange and the wings are translucent, with orange veins and dusky markings near the tips.[10]

Distribution and habitat

Magicicada cassinii is endemic to North America, its range extending across the northern belt of the United States and the southern part of Canada.[10]

Life cycle

These cicadas are true bugs and after having emerged from underground, the adults feed on sap sucked from trees and shrubs. Males amass in great numbers and sing in unison to attract females. The call lasts for two to four seconds and is a series of ticks followed by a drawn-out buzz which rises and falls in pitch. At the end of a chorus, males move to a new perch before starting the song again. After mating, the females insert their ovipositors into shoots and lay their eggs. These hatch about two months later and the first instar nymphs drop to the ground where they move underground and suck xylem sap from small rootlets. This sap is very low in nutritive value and the nymphs grow very slowly. They will moult five times, moving on to larger roots deep in the soil as they grow over a period of seventeen years. Finally, they all tunnel up through the soil and emerge into the open air, before climbing up the vegetation and shedding their skins for a final time to become adults. Although each population has a seventeen year life cycle and emerges in synchrony, past environmental events have occasionally disrupted this pattern and there are several different broods in existence in various parts of the insect's range which emerge in different calendar years.[10][11]

The different broods have been numbered, and the next emergence of Brood X is due to occur in Delaware, Georgia, Illinois, Indiana, Kentucky, Maryland, Michigan, North Carolina, New Jersey, New York, Ohio, Pennsylvania, Tennessee, Virginia, and West Virginia in May and June, 2021.[11][8] Many broods have a sub-brood that emerge a few years before the regular brood. The Brood XIII sub-brood in the Chicago area emerged 4 years early in 2020.

Damage

In outbreak years, the cicadas do significant damage to the trees on which they lay eggs, especially saplings. The female cuts a slit in a twig in which to insert her eggs and this often causes the shoot to droop and defoliate. In larger twigs it may allow entry of disease organisms. The burden of feeding of the nymphs is also considerable. However, it has been shown that there is little long-term harm to mature trees.[12]

Notes
  1. While the original and correct spelling for Fisher's 17-year species is cassinii,[1] with two 'i's, a large majority of publications have spelled the name cassini since the mid-1960s. However, the original spelling has been maintained throughout by taxonomic catalogues,[2][3][4][5] and the rules of nomenclature support the priority of cassinii (Article 33.4).[6] The correct spelling for the 13-year relative is tredecassini.[7]
gollark: No, I can draw *slightly* mentally and offload more complicated stuff to paper.
gollark: Not really.
gollark: Did you not know of this? It's quite common. Some people don't have internal monologues either.
gollark: (it is called aphantasia)
gollark: So, I can't actually mentally visualize anything more complicated than assemblages of lines.

References
  1. Fisher, J. C. 1852. On a new species of Cicada. Proceedings of the Academy of Natural Sciences of Philadelphia 5: 272-275.
  2. Sanborn, A. F. 2013. Catalogue of the Cicadoidea (Hemiptera: Auchenorrhyncha). With contributions to the bibliography by Martin H. Villet. Elsevier. Inc., Academic Press, San Diego, CA.
  3. Duffels, J.P., and P. A. van der Laan. 1984. Catalogue of the Cicadoidea (Homoptera, Auchenorhyncha) 1956-1980. Series Entomologica vol. 34. 414 pp. Junk, Dordrecht, Netherlands
  4. Metcalf, Z.P., 1963. General Catalogue of the Homoptera. Fasc. 8. Cicadoidea. Part 1: Cicadidae. vii, 919 pages. Part 2: vi, 492 pages. [Species index by Virginia Wade, 1964, 26 pp.] University of North Carolina State College, Raleigh, U.S.A.
  5. Dmitriev, D. 2003. 3I Interactive Keys and Taxonomic Databases.
  6. ICZN, 1999. International Code of Zoological Nomenclature, 4th Edition Archived 2009-05-24 at the Wayback Machine. International Trust for Zoological Nomenclature, Natural History Museum, London.
  7. Alexander, R.D., and T. E. Moore. 1962. The evolutionary relationships of 17-year and 13-year cicadas, and three new species (Homoptera, Cicadidae, Magicicada). Miscellaneous Publications of the Museum of Zoology of the University of Michigan 121: 1-59.
  8. "Cicada Mania". 14 April 2020. Retrieved 4 August 2020.
  9. "Periodical Cicada Page". University of Michigan. Retrieved 10 June 2011.
  10. Capinera, John L. (2008). Encyclopedia of Entomology. Springer. p. 2792. ISBN 1-4020-6242-7.
  11. Post, Susan L. (2004). "A Trill of a Lifetime". The Illinois Steward. Archived from the original on 10 May 2007. Retrieved 30 July 2020.
  12. Cook, William M.; Holt, Robert D. (2002). "Periodical Cicada (Magicicada cassini) Oviposition Damage: Visually Impressive yet Dynamically Irrelevant" (PDF). American Midland Naturalist. 147: 214–224. doi:10.1674/0003-0031(2002)147[0214:PCMCOD]2.0.CO;2. Archived from the original (PDF) on 7 August 2011.CS1 maint: multiple names: authors list (link)
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