However, mites range in their eating habits from the classic predators to a multitude of parasites, fungivores, and phytophages that often reach pest status, and they have thousands of species secondarily invading freshwater and marine habitats. Additionally, extant arachnids are generally terrestrial, found in every conceivable habitat on land. Most arachnids, and chelicerates in general, are predacious and have developed a multitude of strategies for catching prey. So while mites have a maximum of six legs as larvae and eight legs as adults, some mites have secondarily lost leg pairs, so there are examples of mites with all known combinations from eight pairs of legs to none. Most arachnid generalizations (and animal generalizations, for that matter) can be broken by at least one mite species. Finally, arachnids generally have four pairs of legs, but larval ricinuleids and mites have six legs. Behind the chelicerae, there are two pedipalps that can be significantly modified among different orders. Unlike in all other arthropods, the first appendages in chelicerates are not sensory antennae but pincer-like mouthparts known as chelicerae (hence the subphylum name). The prosoma holds six pairs of appendages. These regions have been subdivided in some groups (e.g., solifugids, scorpions).
There are eleven living arachnid orders, and Arkansas has representatives of five of these including Scorpiones ( scorpions), Pseudoscorpiones ( pseudoscorpions), Opiliones ( harvestmen), Aranea (spiders), and Acari ( mites).Īrachnid bodies are divided into two main regions called the prosoma (cephalothorax) and opisthosoma (abdomen). The other three groups are Crustacea, Myriapoda ( centipedes and millipedes), and Hexapoda ( insects and relatives). Arachnids belong to Chelicerata, one of four groups of living arthropods.
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