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Arachnids are arthropods in the class Arachnida (/ ə ˈ r æ k n ɪ d ə /) of the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegaroons. [2] Adult arachnids have eight legs attached to the cephalothorax.
Species Mesotarbus hindi Pocock, ... Arachnida. pp. 42–162 in Treatise on Invertebrate Palaeontology, part P ... 10.1017/S0263593300000651 - PDF available on ...
Mites are tiny members of the class Arachnida; most are in the size range 250 to 750 μm (0.01 to 0.03 in) but some are larger and some are no bigger than 100 μm (0.004 in) as adults. The body plan has two regions , a cephalothorax (with no separate head) or prosoma, and an opisthosoma or abdomen.
Pseudoscorpions belong to the class Arachnida. [2] They are small arachnids with a flat, pear-shaped body, and pincer-like pedipalps that resemble those of scorpions. They usually range from 2 to 8 mm (0.08 to 0.31 in) in length. [3] The largest known species is Garypus titanius of Ascension Island [4] at up to 12 mm (0.5 in).
Some species have wings. They are an extremely diverse group, with up to 10 million species. Arthropods are invertebrate animals with a chitinous exoskeleton, segmented bodies, and jointed legs. The phylum Arthropoda contains numerous taxonomic orders in over 20 classes.
Trombidiidae, also known as red velvet mites, true velvet mites, [2] or rain bugs, are small arachnids (eight-legged arthropods) found in plant litter and are known for their bright red color.
[10] [13] As in other scorpions, the venom of H. tamulus consists of a complex mixture of proteins. Some major components have been isolated, including the toxin tamapin . Scorpion envenomation with high morbidity and mortality is usually due to either excessive autonomic activity and cardiovascular toxic effects or neuromuscular toxic effects.
For example, certain Desis species spend the high tide in an air-filled underwater retreat made from silk and forage on land in the intertidal zone during low tide. [ 10 ] [ 14 ] [ 15 ] Some spiders living in periodically flooded habitats can survive for an extended period underwater by entering a coma-like state, up to 16–36 hours in Arctosa ...