Overview

Brief Summary

There are around 3,200 species of treehopper or thorn bug. These insects have a pointy horn on their backs that looks like a thorn. The thorn probably helps them hide from birds and other predators. Treehoppers feed on sap by cutting plants with their sharp beaks.

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Comprehensive Description

Taxon images

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Distribution

Afrotropical, Australian, Indomalayan, Neotropical, Nearctic, Palearctic, and Oceanic regions. All subfamilies are restricted to the New World, except for the large family Centrotinae, which is predominately Old World in distribution.
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Physical Description

Diagnostic Description

Diagnostic characters

Frontoclypeus flat or convex. Distance from eye to base of forewing usually greater than half eye width (exceptions: Deiroderes and many Nicomiinae). Pronotum usually produced posteriorly over scutellum (exceptions: Endoiastinae, Nicomiinae, Deiroderes, Abelus, and Hemicentrus), often also with anterior, lateral, or dorsal projections. Scutellum usually concealed and reduced, if visible, posterior apex rounded, acuminate, emarginate, or grooved medially. Forewings with vein M fused with Cu basally (share common stem; exceptions: some Nicomia and some Smiliinae). Prothoracic trochanter and femur not fused. Male abdominal segment IX usually with lateral plates discrete from pygofer (exceptions: fused to pygofer in few members of various tribes; lateral plates absent in Anchistrotus and some Stegaspidini). Female pygofer not strongly produced posteroventrally. Nymph with abdominal tergum IX forming sheath around segment X, anal opening dorsal or posterior.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records: 1359
Specimens with Sequences: 969
Specimens with Barcodes: 714
Species: 293
Species With Barcodes: 269
Public Records: 663
Public Species: 264
Public BINs: 129
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Barcode data

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Wikipedia

Treehopper

Treehoppers (more precisely typical treehoppers to distinguish them from the Aetalionidae) and thorn bugs are members of the family Membracidae, a group of insects related to the cicadas and the leafhoppers. About 3,200 species of treehoppers in over 400 genera are known.[1] They are found on all continents except Antarctica; only three species are known from Europe. Individual treehoppers usually live for only a few months.

Morphology[edit]

Thorn bugs, due to their unusual appearance, have long interested naturalists. They are best known for their enlarged and ornate pronotum, which most often resembles thorns, apparently to aid camouflage. In some species, the pronotum grows to a horn-like extension, but even more bizarre and hard-to-describe shapes are also found. The specialised pronotum (or helmet) may not be simply an expansion of the prothoracic sclerite, but a fused pair of dorsal appendages of the first thoracic segment.

These may be serial homologues of insect wings, which are dorsal appendages of the second and/or third thoracic segments. Evidence for this theory includes the development of the helmet, which arises as a pair of appendages attached to each side of the dorsal prothorax by an articulation with muscles and a flexible membrane that allow it to be mobile. Also, the same genes are involved in development of the helmet and the wings.[2] Distinguishing males from females is accomplished only by looking at the genitalia.

Ecology[edit]

Treehoppers pierce plant stems with their beaks, and feed upon sap. The immatures can frequently be found on herbaceous shrubs and grasses, whereas the adults more often frequent hardwood tree species. Excess sap becomes concentrated as honeydew, which often attracts ants. Some species have a well-developed ant mutualism, and these species are normally gregarious, as well, which attracts more ants. The ants provide protection from predators. Treehoppers mimic thorns to prevent predators from spotting them.

Others have formed mutualisms with wasps, such as Parachartergus apicalis.[3] Even geckos form mutualistic relations with treehoppers, with whom they communicate by small vibrations of the abdomen.[4]

Eggs are laid by the female with her saw-like ovipositor in slits cut into the cambium or live tissue of stems, though some species lay eggs on top of leaves or stems. The eggs may be parasitised by wasps, such as the tiny fairyflies (Mymaridae) and Trichogrammatidae. The females of some membracid species sit over their eggs to protect them from predators and parasites, and may buzz their wings at intruders. The females of some gregarious species work together to protect each other's eggs. In at least one species, Publilia modesta, mothers serve to attract ants when nymphs are too small to produce much honeydew. Some other species make feeding slits for the nymphs.[5]

Like the adults, the nymphs also feed upon sap, and unlike adults, have an extensible anal tube that appears designed to deposit honeydew away from their bodies. The tube appears to be longer in solitary species rarely attended by ants. It is important for sap-feeding bugs to dispose of honeydew, as otherwise it can become infected with sooty moulds. Indeed, one of the evident benefits of ants for Publilia concava nymphs is that the ants remove the honeydew and reduce such fungal growth.

Most species are innocuous to humans, although a few are considered minor pests, such as Umbonia crassicornis (a thorn bug), the three-cornered alfalfa hopper (Spissistilus festinus), and the buffalo treehopper (Stictocephala bisonia), which has been introduced to Europe. The cowbug Oxyrachis tarandus has been recorded as a pest of Withania somnifera in India.[6]

Systematics[edit]

The diversity of treehoppers has been rather little researched, and their systematic arrangement is tentative. It seems three main lineages can be distinguished; the Endoiastinae are the most ancient treehoppers, still somewhat resembling cicadas. Centrotinae form the second group; they are somewhat more advanced but the pronotum still does not cover the scutellum in almost all of these. The Darninae, Heteronotinae, Membracinae and Smiliinae contain the most apomorphic treehoppers.

Several proposed subfamilies seem to be paraphyletic. Centronodinae and Nicomiinae might need to be merged into the Centrotinae to result in a monophyletic group.

References[edit]

  1. ^ Treehoppers. Dr. Metcalf. NCSU Libraries. North Carolina State University.
  2. ^ B. Prud'homme et coll (2011). "Body plan innovation in treehoppers through the evolution of an extra wing-like appendage". Nature 473 (7345): 83–86. doi:10.1038/nature09977. 
  3. ^ Wetterer, J. K., et al. (2000). "Diel shifts in treehopper-tending by ants and wasps in Costa Rica (Hymenoptera)" (PDF). Sociobiology 36: 1. 
  4. ^ BBC documentary Life in Cold Blood, episode Dragons of the Dry, minute 22
  5. ^ Lin, C., et al. (2004). "Molecular phylogenetics and evolution of maternal care in membracine treehoppers" (PDF). Systematic Biology 53 (3): 400–421. doi:10.1080/10635150490445869. PMID 15503670. 
  6. ^ Sharma. A. and P. K. Pati (2011). "First report of Withania somnifera (L.) Dunal, as a new host of cowbug (Oxyrachis tarandus, Fab.) in plains of Punjab, northern India" (pdf). World Applied Sciences Journal 14 (9): 1344–1346. ISSN 1818-4952. 


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