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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Hexapoda
Classis: Insecta
Cladus: Dicondylia
Subclassis: Pterygota
Cladus: Metapterygota
Infraclassis: Neoptera
Cladus: Eumetabola
Cladus: Endopterygota
Superordo: Coleopterida
Ordo: Coleoptera
Subordo: Polyphaga
Superfamilia: Curculionoidea

Familia: Curculionidae
Subfamilia: Baridinae
Tribus: Madarini
Genus: Zyzzyva
Species (3): Z. ochreotecta – Z. rufula – Z. squamosa

[source: Catalogue of Life: 2013 Annual Checklist]
Name

Zyzzyva Casey, 1922

Primary references

Casey 1922: Mem. Col., 10, 369.

Zyzzyva /ˈzɪzɪvə/ is a genus of South American weevils, often found on or near palm trees.[1] It was first described in 1922 by Thomas Lincoln Casey, Jr., based on specimens obtained in Brazil by Herbert Huntingdon Smith.[2]: 2, 369 

Casey describes Zyzzyva ochreotecta in his book Memoirs on the Coleoptera, Volume 10:[2]: 369–370 

Rather broadly oblong-oval, convex, densely clothed with scales, ochreous and very uniform above, completely concealing the sculpture; beak (♂) scarcely longer than the prothorax, thick, distinctly arcuate, compressed basally, finely, closely punctate, longitudinally furrowed and carinate above; antennae obscure rufous; prothorax two-fifths wider than long, the sides parallel and nearly straight in basal two-fifths, thence oblique and nearly straight to the apex, which is truncate and much less than half as wide as the base; parallel scales dense and directed longitudinally in great part; elytra a third longer than wide, a fifth or sixth wider than the prothorax and nearly two and one-half times as long, the sides parallel, broadly, circularly rounded in apical third, the sutural angle not reëntrant; pygidium closely but not densely clothed with slender and suberect pale squamules; under surface without sexual mark, the first ventral suture fine but very distinct throughout, the others coarse, the fourth not reflexed at the sides. Length 4.3 mm.; width 2.0 mm. Brazil (Santarem). One specimen.

Zyzzyva has achieved notoriety for being the last word in several English-language dictionaries.[3][4][5] Casey is commonly credited with naming the genus, although the etymology of the word is unclear.[5][3][1] One theory is that the word was inspired by Zyzza, a former genus of leafhoppers.[3] An entomologist at New York's Museum of Natural History speculated that Casey made up the word as a joke, "to have the last word."[5]
See also

Aaaaba
Aaadonta
Zyzzogeton, a leafhopper, another "last entry"
Zyzzyxdonta alata
Zyzzyzus
Zzyzx (disambiguation)

References
Look up zyzzyva in Wiktionary, the free dictionary.

Andrews, Travis M. (2017-06-27). "The Oxford English Dictionary has a new last word. Bet you can't pronounce it". Washington Post. Archived from the original on 2017-06-27. Retrieved 2021-06-27.
Casey, Thomas L. (1922). Memoirs on the Coleoptera. Vol. 10. Lancaster, PA: New Era. doi:10.5962/bhl.title.15993. BHL page 15912352.
Martin, Katherine Connor (2017-06-16). "New words notes June 2017". Oxford English Dictionary. Oxford University. Archived from the original on 2021-06-27. Retrieved 2021-06-27.
"What is the absolute last word in any dictionary?". Dictionary.com. Archived from the original on 2014-08-23. Retrieved 2021-06-27.
Storer, Doug (1981-04-24). "He Looks Like A Pig, A Bear, Kangaroo..." Amazing But True. The Evening Independent. St. Petersburg, FL. p. 6-B. Retrieved 2021-06-27.

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