Monday, August 26, 2013

Thorn-mimic Tree hopper


     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 thecicadas and the leafhoppers. About 3,200 species of treehoppers in over 400 genera are known. They are found on all continents except Antarctica; only three species are known from Europe.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.Thorn bugs, due to their unusual appearance, have long interested naturalists. Distinguishing males from females is accomplished only by looking at the male genitalia. Individual treehoppers usually live for only a few months.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. They may beserial 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 genesare involved in development of the helmet and the wings.

Behavior, feeding and habitat

     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.Even geckos form mutualistic relations with treehoppers, with whom they communicate by small vibrations of the abdomen.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.Like the adults, the nymphs also feed upon sap, and unlike adults, have an extensible anal tube that appears designed to deposit honeydewaway 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 concavanymphs 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.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 cicadasCentrotinae form the second group; they are somewhat more advanced but the pronotum still does not cover the scutellum in almost all of these. The DarninaeHeteronotinaeMembracinaeand Smiliinae contain the most apomorphic treehoppers.Several proposed subfamilies seem to be paraphyleticCentronodinae and Nicomiinae might need to be merged into the Centrotinae to result in a monophyletic group.

     A very nice living being almost looks like a Thorn on plants, when closely examined, its the Thorn Mimic Tree hopper, as very tiny insect. I observed this when I was doing Macro photography of Blue Bottlefly, in the adjacent plant. My Macro is cost effective and a smart Macro, as I solely do Extreme Close-ups with my Canon EF 50mm F1.8 II lens with 24mm, 12mm, 36mm extension tubes combined, with a Lens reversal ring, which gives me equivalent magnification of a Macro lens, so why buy a Macro lens paying a hefty price??? In addition to the improvement in my tolerance levels and patience, these microscopic beauties have even enhanced my IQ, for which I am always thankful to Nature and I am happy 2 present the best of Nature to our friends and followers across the globe.

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