Froghopper

The froghoppers, or the superfamily Cercopoidea, 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 they are best known for their plant-sucking nymphs which encase themselves in foam in springtime.

Froghopper
Prosapia bicincta
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Hemiptera
Suborder:
Auchenorrhyncha
Infraorder:
Cicadomorpha
Superfamily:
Cercopoidea

Leach, 1815
Families

Taxonomy

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. More recently, the family Epipygidae has been removed from the Aphrophoridae.[1]

Spittlebug nymphs

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.[2] Normally an animal shouldn't be able to survive on a diet so low in nutrients, but the insects' digestive system have two symbiotic bacteria that provides them with the essential amino acids.[3]

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 quickly dry up. 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.

  • The spittlebug nymph
  • Nymphal form of spittlebug encased in foam for protection and moisture

Adults

Adult froghoppers jump from plant to plant; some species can jump up to 70 cm vertically: a more impressive performance relative to body weight than fleas. The froghopper can accelerate at 4,000 m/s2 over 2 mm as it jumps (experiencing over 400 gs of acceleration).[4] Spittlebugs[5] can jump 100 times their own length.

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 (see photos).

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References
  1. Hamilton, K. G. Andrew (2001). "A new family of froghoppers from the American tropics (Hemiptera: Cercopoidea: Epipygidae)". Biodiversity. 2 (3): 15–21. doi:10.1080/14888386.2001.9712551. ISSN 1488-8386.
  2. Marshall, Stephen A. (2017). Insects: Their Natural History and Diversity (Second ed.). Buffalo, NY: Firefly Books. p. 104. ISBN 978-1-77085-962-3.
  3. Two bacteria allow spittlebugs to thrive on low-nutrient meals
  4. Burrows, Malcolm (December 1, 2006). "Jumping performance of froghopper insects". The Journal of Experimental Biology.
  5. Spittlebugs Lucy (April 29, 2017) Garden Ambition
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