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Phoresis

Phoresis or phoresy is a temporary commensalistic relationship when an organism attaches itself to a host organism solely for travel. It has been seen in ticks and mites since the 18th century, and in fossils 320 million years old. It is not restricted to arthropods or animals; plants with seeds that disperse by attaching themselves to animals are also considered to be phoretic.

Mutualism, parasitism, and predation
The strict definition of phoresis excludes cases in which the relationship is permanent (e.g. that of a barnacle surviving on a whale), or those in which the phoront gains any kind of advantage from the host organism (e.g. remoras attaching to sharks for transportation and food). ==Examples of phoretic relationships==
Examples of phoretic relationships
Examples may be found in the arthropods associated with sloths. Coprophagous sloth moths, such as Bradipodicola hahneli and Cryptoses choloepi, are unusual in that they exclusively inhabit the fur of sloths, mammals found in central and South America. The sloth provides transport for the moths, the females of which oviposit in the droppings of sloths, which the larvae feed on, and the newly hatched moths move into the forest canopy in search of a new sloth host. Larvae of the blister beetle (Meloe franciscanus) need to find the nests of their host, the solitary bee (Habropoda pallida), to continue their life cycle. The larvae gather in colonies, and emit chemicals that mimic the pheromones of the female solitary bee. Larvae attach to the attracted males when they visit the false source of pheromones, and then subsequently to any female the male mates with. The blister beetle larvae then infest and parasitize the female bee's nest. of the bee mite Chaetodactylus krombeini shows distinct morphological adaptations for phoresy relative to other parts of its life cycle. Some mites in the clade Astigmatina have a stage of their life cycle (the deutonymph or hypopus) that is modified specifically for phoresis. This stage has reduced mouthparts, a well-sclerotised body that resists desiccation, and usually a posteroventral organ for attaching to the host animal (which may be an invertebrate or a vertebrate). Astigmatans often live in patchy and ephemeral habitats such as fungal fruiting bodies, dung, carrion, animal nests, tree sap flows and decaying wood. Phoresis allows these mites to quickly leave a depleted habitat and travel to a new one. A specific example is deutonymphs of Lardoglyphus dispersing on beetles in the genus Dermestes to reach new habitats (both phoront and host feed on animal materials). A specialist mite (Parasitellus fucorum) that parasitizes bumble bees (Bombus spp.) avoids inbreeding depression in a single hive, and remains genetically independent of any specific host lineage by travelling to a new hive. This is accomplished by travelling on a foraging bee to a flower and detaching, and waiting for and attaching to another bee which may be from another hive, and infesting the new hive. These mites can survive on flowers for up to 24 hours, and have shown a preference for opened flowers, where they would be most likely to find a host. The pseudoscorpion Cordylochernes scorpioides is frequently found riding harlequin beetles (Acrocinus longimanus). Initially, there were a number of alternate hypothesis for why the pseudoscorpions were found on the beetles: by accident, to forage for mites inhabiting the beetle, or as an obligate parasite. Evidence suggested, however, that the pseudoscorpions were using beetles to travel from tree to tree, where they preyed upon other beetle larvae. The largest mammalian example of phoresis is human beings directly riding on horses or other animals, or using them to pull vehicles with humans in them. == See also ==
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