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2.3 Class Arachnida (Arachnids) ... 4.10 Class Malacostraca (Malcostracans, such as crabs and lobsters) 4.10.1 Subclass Eumalacostraca. 4.10.2 Subclass Hoplocarida.
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 .
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.
The order Trigonotarbida is a group of extinct arachnids whose fossil record extends from the late Silurian to the early Permian (Pridoli to Sakmarian). [1] [2] [3] These animals are known from several localities in Europe and North America, as well as a single record from Argentina.
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).
Ricinulei is a small order of arachnids.Like most arachnids, they are predatory; eating small arthropods.They occur today in west-central Africa and the Americas (Cryptocellus and Pseudocellus) from South America to as far north as Texas, where they either inhabit leaf-litter or caves.
Some species of amblypygids, particularly Phrynus marginemaculatus and Damon diadema, may be among the few examples of arachnids that exhibit social behavior. Research conducted at Cornell University suggests that mother amblypygids communicate with their young with her antenniform front legs, and the offspring reciprocate both with their ...
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 ...
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