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Many arthropods bite or sting in order to immobilize their prey or deter potential predators as a defense mechanism. Stings containing venom are more likely to be painful. Less frequently, venomous spider bites are also associated with morbidity and mortality in humans. Most arthropod stings involve Hymenoptera (ants, wasps, and bees). While ...
For example, in North America the estimated number of insect species exceeds 163,000, of which only about two thirds are taxonomically known. [4] An even greater discovery awaiting, over 72 percent of North American arachnids are yet to be named and described. [4] The total number of living arthropod species is probably in the tens of millions. [3]
The group is generally regarded as monophyletic, and many analyses support the placement of arthropods with cycloneuralians (or their constituent clades) in a superphylum Ecdysozoa. Overall, however, the basal relationships of animals are not yet well resolved. Likewise, the relationships between various arthropod groups are still actively debated.
List of threatened and endangered arthropods, including insects, arachnids, and crustaceans under the United States Endangered Species Act as of October 2013. [1] Key to Listing Status codes: [2] E - Endangered. An animal or plant species in danger of extinction throughout all or a significant portion of its range. T - Threatened. An animal or ...
Poisonous fireworms were spotted along the Texas coast recently, with the Harte Research Institute for Gulf of Mexico Studies documenting the unique sighting online.
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Hippos are native to Africa and live mainly in sub-Saharan regions. They are semi-aquatic mammals and spend much of their time in slow-moving bodies of water like swamps, lakes, estuaries ...
Arthropod eyes Head of a wasp with three ocelli (center), and compound eyes at the left and right. Most arthropods have sophisticated visual systems that include one or more usually both of compound eyes and pigment-cup ocelli ("little eyes"). In most cases, ocelli are only capable of detecting the direction from which light is coming, using ...