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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.
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.
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).
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.
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.
The oldest fossils of acariform mites are from the Rhynie Chert, Scotland, which dates to the early Devonian, around 410 million years ago [4] [5] The Cretaceous Immensmaris chewbaccei had idiosoma of more than 8 mm (0.31 in) in length and was the largest fossil acariform mite and also the largest erythraeoid mite ever recorded.
Lycosoidea is a clade or superfamily of araneomorph spiders.The traditional circumscription was based on a feature of the eyes. The tapetum is a reflective layer at the back of the eye, thought to increase sensitivity in low light levels.