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Arachnida

File:Arachnida_collage.png · Wikimedia Commons · See Wikimedia Commons

EntityQ1358· pop 105· linked from 19,078 articles

Also known as arachnid, arachnids, Arachnid

Arachnids are arthropods in the class Arachnida () of the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegaroons.

AI overview

Arachnids are a large group of arthropods that includes spiders, scorpions, ticks, mites, and several other related creatures. They are important members of ecosystems worldwide, filling roles as predators, parasites, and decomposers that affect both human health and natural environments.

AI-generated from the Wikipedia summary — may contain errors.

Species

arachnids

Arachnida

CLASS

  1. KingdomAnimalia
  2. PhylumArthropoda
  3. ClassArachnida
Habitatmarine, brackish, freshwater
Observations recorded12,769,705

蛛形綱(學名:Arachnida)又名蜘蛛綱,是節肢動物下的一個綱,有65,000~73,000左右的物種,包括了蜘蛛、蠍子、壁蝨、螨等。蜘蛛、蠍子等常被大眾誤解為昆蟲,雖然同屬節肢動物門,可是它們都獨立於昆蟲綱之外,屬於蛛形綱。蛛形綱動物的特徵是擁有八隻腳,半變態,卵一孵化就是成體的縮小版了。蛛形綱動物大多在陸地生活,大部分為肉食性。有一些蜘蛛和蠍子有毒,主要用作自衛及捕獵用途,但大部分的蛛形綱都是無毒的。 分類 根據2011年的分類,現時蛛形綱(Arachnida Cuvier, 1812)有物種112,201種,當中化石種有†1,586,可作以下分類[2]: Order 1 Order 1.1 盲蛛目 Opiliones Sundevall, 1833: (6,519 species, of which †35 species)11 Order 1.2 蝎形目 Scorpiones C.L. Koch, 1851: (2,068 species, of which †121 species)12 跑足亚纲 Dromopoda Order 2.1 避日目 Solifugae Sundevall, 1833: (1,116 species, of which †3 species)13 Order 2.2 拟蝎目 Pseudoscorpiones de Geer, 1778: (3,494 species, of which †40 species)14 Order 3 鬚腳目 Palpigradi Thorell, 1888: (83 species, of which †1 species)15 Order 4 †古怖目 Phalangiotarbida Haase, 1890: (†31 species )16 Order 5 节腹目 Ricinulei Thorell, 1876: (73 species, of which †15 species)17 寄蟎總目 Parasitiformes[3] Order 6.1 節腹蟎目 Opilioacarida Zakhvatkin, 1952: (37 species, of which †2 species)18 Order 6.2 巨蟎目 Holothyrida Thon, 1905: (27 species) Order 6.3 真蜱目 Ixodida Leach, 1815: (896 species, of which †5 species) 19 Order 6.4 革蟎目 Mesostigmata G. Canestrini, 1891: (11,424 species) 蟎形總目 Acariformes Order 7.1 恙螨目 Trombidiformes Reuter, 1909

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Wikidata facts

Image
Haeckel Arachnida.jpg
Show 5 more facts
Commons category
Arachnida
taxon name
Arachnida
Commons gallery
Arachnida
taxon common name
pajkovci
start time
380000000-
Sources (7)

via Wikidata · CC0

~17 min read

Article

13 sections
Contents
  • Morphology
  • Locomotion
  • Physiology
  • Diet and digestive system
  • Senses
  • Reproduction
  • Taxonomy and evolution
  • Phylogeny
  • Fossil history
  • Taxonomy
  • See also
  • References
  • External links

Arachnids are arthropods in the class Arachnida () of the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegaroons.

Adult arachnids have eight legs attached to the cephalothorax. In some species the frontmost pair of legs has converted to a sensory function, while in others, different appendages can grow large enough to take on the appearance of extra pairs of legs.

Gallery (53)

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