{{Short description|Superfamily of true bugs}} {{Automatic Taxobox | name = Froghopper | image = Prosapia bicincta Kaldari.jpg | image_caption = ''Prosapia bicincta'' | fossil_range = {{fossilrange|Early Jurassic|Present}} | taxon = Cercopoidea | authority = Leach, 1815 | subdivision_ranks = Families | subdivision = *Aphrophoridae *Cercopidae *Clastopteridae *Ischnorhinidae *Machaerotidae *†Procercopidae *†Sinoalidae }} [[File:Phymatostetha Deschampsi Karalakam.jpg|thumb|''Phymatostetha deschampsi'' from India]]
The superfamily '''Cercopoidea''', some members of which are called '''froghoppers''' and still others known as '''spittlebugs''', are a group of hemipteran insects in the suborder Auchenorrhyncha. Adults are capable of jumping many times their height and length, giving the group their common name, but many species are best known for their plant-sucking nymphs which produce foam shelters, and are referred to as "spittlebugs".
==Taxonomy== {{cladogram| |align=left |caption=Relationships with other groups based on Cryan (2005).<ref name=Cryan2005>{{cite journal|doi=10.1111/j.1365-3113.2004.00285.x|title=Molecular phylogeny of Cicadomorpha (Insecta: Hemiptera: Cicadoidea, Cercopoidea and Membracoidea): Adding evidence to the controversy|year=2005|last1=Cryan|first1=Jason R.|journal=Systematic Entomology|volume=30|issue=4|pages=563–574}}</ref> |cladogram= {{clade|style=font-size:75%;line-height:75% |label1= |1={{clade |1=Membracoidea |label2= |2={{clade |1=Cicadoidea |label2='''Cercopoidea''' |2={{clade |label1= |1={{clade |1=Machaerotidae |2=Clastopteridae }} |label2= |2={{clade |1=Cercopidae |2=Aphrophoridae (incl. Epipyginae) }} }} }} }} }}
}} Traditionally, most of this superfamily was considered a single family, the Cercopidae, but this family has been split into three families for many years now: the Aphrophoridae, Cercopidae, and Clastopteridae. The tribe Epipygini was removed from the Aphrophoridae and elevated to family rank in 2001,<ref name=Hamilton2001>{{Cite journal | title = A new family of froghoppers from the American tropics (Hemiptera: Cercopoidea: Epipygidae) | date = 2001 | last1 = Hamilton | first1 = K. G. Andrew | journal = Biodiversity | volume = 2| issue = 3| pages = 15–21 | issn = 1488-8386 | doi = 10.1080/14888386.2001.9712551 | s2cid = 84721507 }}</ref> but four subsequent phylogenies all showed this lineage was firmly nested within Aphrophoridae (e.g.<ref name=Cryan2005 /><ref name=Cryan2010>Cryan, J.R., Svenson, G.J. (2010) Family-level relationships of the spittlebugs and froghoppers (Hemiptera: Cicadomorpha: Cercopoidea). Systematic Entomology, 35: 393-415. https://doi.org/10.1111/j.1365-3113.2009.00520.x</ref><ref name=Hamilton2016>Hamilton, K.G.A. (2016) Neotropical spittlebugs related to Neaenini (Hemiptera, Cercopidae) and the origins of subfamily Cercopinae, Zootaxa 4169: 201-250. https://doi.org/10.11646/zootaxa.4169.2.1</ref><ref name=Crispolon2023>Crispolon, E. S. Jr., Soulier-Perkins, A., & Guilbert, E. (2023). Molecular phylogeny of Cercopidae (Hemiptera, Cercopoidea). Zoologica Scripta, 52, 494–516. https://doi.org/10.1111/zsc.12597</ref>). More recently, in 2023, a phylogenetic analysis concluded that Cercopidae was not monophyletic, with the New World lineages representing the sister taxon to all other cercopoids, and accordingly raised from subfamily to family status as Ischnorhinidae in order to keep all of the cercopoid families monophyletic.<ref name=Crispolon2023 />
==Spittlebug nymphs{{anchor|Cuckoo spit}}== These families are best known for the nymphal stage, which produces a cover of foamed-up plant sap visually resembling saliva; the nymphs are therefore commonly known as spittlebugs and their foam as cuckoo spit, frog spit, or snake spit. This characteristic spittle production is associated with the unusual trait of xylem feeding. Whereas most insects that feed on sap feed on the nutrient-rich fluid from the phloem, Cercopidae utilize the much more dilute sap flowing upward from the roots via the xylem. The large amount of excess water that must be excreted and the evolution of special breathing tubes allow the young spittlebug nymphs to grow in the relatively protective environment of the spittle.<ref>{{cite book |last1=Marshall |first1=Stephen A. |title=Insects: Their Natural History and Diversity |date=2017 |publisher=Firefly Books |location=Buffalo, NY |isbn=978-1-77085-962-3 |page=104 |edition=Second}}</ref> Normally an animal should not be able to survive on a diet so low in nutrients, but the insects' digestive system contains symbiotic bacteria that provide them with the essential amino acids.<ref>[https://www.sciencedaily.com/releases/2020/05/200528172000.htm Two bacteria allow spittlebugs to thrive on low-nutrient meals] May 28, 2020 www.sciencedaily.com accessed 11 May 2023</ref>
The foam serves a number of purposes. It hides the nymph from the view of predators and parasites, and it insulates against heat and cold, thus providing thermal control and also moisture control; without the foam, the insect would risk dehydration. The nymphs pierce plants and suck sap causing very little damage; much of the filtered fluids go into the production of the foam, which has an acrid taste, deterring predators. A few species are serious agricultural pests.
A small family in the group, the Machaerotidae, known as the tube spittlebugs, is an outlier among the Cercopoidea because the nymphs live in calcareous tubes rather than producing foam as in the other families.
<gallery widths="170px" heights="200px"> File:Spittlebug nymph (unknown species), East Lyn River, Devon, UK - Diliff.jpg|Spittlebug nymph Image:Spittlebug4383.JPG|Spittlebug nymph surrounded by foam for protection and moisture File:Spittlebug.webm|thumbtime=193|Spittlebug nymph reforming its protective bubble covering </gallery>
==Adults== Adult froghoppers jump from plant to plant; some species can jump up to {{cvt|70|cm}} vertically: a more impressive performance relative to body weight than fleas. The froghopper can accelerate at {{cvt|4,000|m/s2}} over {{cvt|2|mm}} as it jumps (experiencing over 400 gs of acceleration).<ref>{{cite journal|last1=Burrows|first1=Malcolm |title=Jumping performance of froghopper insects |journal=The Journal of Experimental Biology |date=December 1, 2006|volume=209 |issue=23 |pages=4607–4621 |doi=10.1242/jeb.02539 |pmid=17114396 |s2cid=41497245 |url=http://jeb.biologists.org/content/209/23/4607.full|doi-access= |url-access=subscription }}</ref> Spittlebugs can jump 100 times their own length.<ref>[https://gardenambition.com/how-to-get-rid-of-spittlebugs/ Spittlebugs] Lucy M. Clark (April 29, 2017) Garden Ambition, accessed 11 May 2023</ref>
Many species of froghopper resemble leafhoppers, but can be distinguished by the possession of only a few stout spines on the hind tibiae, where leafhoppers have a series of small spines. Members of the family Machaerotidae greatly resemble treehoppers, due to a large thoracic spine, but the spine in machaerotids is an enlargement of the scutellum, where treehoppers have the pronotum enlarged. Members of the family Clastopteridae have their wings modified to form false heads at the tail end, an antipredator adaptation. Many adult Cercopidae can bleed reflexively from their tarsi, and the hemolymph appears to be distasteful; they are often aposematically colored.
== Evolutionary history == The oldest froghoppers are known from the Early Jurassic. Mesozoic froghoppers are divided into two main families, Procercopidae known from the Early Jurassic to early Late Cretaceous of Asia, which are thought to be ancestral to living froghoppers, and Sinoalidae, which is known from the late Middle Jurassic and early Late Cretaceous of Asia.<ref name=":0">{{Cite journal|last1=Chen|first1=Jun|last2=Wang|first2=Bo|last3=Zheng|first3=Yan|last4=Jiang|first4=Hui|last5=Jiang|first5=Tian|last6=Bozdoğan|first6=Hakan|last7=Zhang|first7=Junqiang|last8=An|first8=Baizheng|last9=Wang|first9=Xiaoli|last10=Zhang|first10=Haichun|date=February 2020|title=Taxonomic review and phylogenetic inference elucidate the evolutionary history of Mesozoic Procercopidae, with new data from the Cretaceous Jehol Biota of NE China (Hemiptera, Cicadomorpha)|journal=Journal of Zoological Systematics and Evolutionary Research|language=en|volume=58|issue=1|pages=174–193|doi=10.1111/jzs.12349|issn=0947-5745|doi-access=free}}</ref> The genus ''Qibinius'' the Middle Jurassic Yanan Formation of China mixes characters of both families and cannot be assigned to either.<ref>{{Cite journal|last1=Fu|first1=Yanzhe|last2=Huang|first2=Diying|date=2020-05-28|title=A new fossil cercopoid from the middle Jurassic Ordos and Jiyuan basins, northern China (Hemiptera, Cicadomorpha)|url=https://www.tandfonline.com/doi/full/10.1080/08912963.2020.1765167|journal=Historical Biology|volume=33 |issue=10 |language=en|pages=2025–2030|doi=10.1080/08912963.2020.1765167|s2cid=219747247 |issn=0891-2963|url-access=subscription}}</ref> The genus ''Cercopion'' from the Aptian aged Crato Formation of Brazil appears to be derived from the Procerocopidae and closely related to the crown group.<ref name=":0" />
==References== {{Reflist}}
==Further reading== * Thompson, Vinton. 2026 "[https://www.cornellpress.cornell.edu/book/9781501786099/spittlebugs/#bookTabs=1 ''Spittlebugs'']" Cornel University Press, Ithaca and London, ISBN 97815017786099
==External links== {{Wikispecies|Cercopoidea}} {{Commons category|Cercopoidea}} * [https://news.bbc.co.uk/2/hi/science/nature/3110719.stm BBC: "Garden insect is jump champion"] * [http://www.catalogueoflife.org/annual-checklist/2008/search_results.php?search_type=browse_by_classification&kingdom=Animalia&phylum=&tax_class=&order=&superfamily=Cercopoidea&family=&genus=&species=&infraspecies=&match_whole_words=on&Submit=Search+%3E%3E List of all Cercopoidea species from COOL database by A Soulier-Perkins in the 2008 Catalogue of Life] * [http://www.lib.ncsu.edu/specialcollections/digital/metcalf/index.html DrMetcalf: a resource on cicadas, leafhoppers, planthoppers, spittlebugs, and treehoppers] * {{Cite NIE|wstitle=Froth-fly|year=1906 |short=x}}
{{Hemiptera|1}} {{Taxonbar|from=Q137213}}
Category:Aposematic animals Category:Cicadomorpha Category:Cercopoidea