蜘蛛綱

蜘蛛綱 (Arachnid) 又叫蛛形綱，節肢動物門中嘅其中一綱。大約有 65,000-73,000 個物種，包括咗蜘蛛、蠍子、牛痺、蟎等等。

How to read a taxobox 蜘蛛綱
"Arachnida" from Ernst Haeckel's Kunstformen der Natur, 1904
物種分類
界 動物界 門 節肢動物門 亞門(Subphylum): 螯肢亞門 綱 蜘蛛綱 Cuvier, 1812
Orders
蟎目 Acarina 鞭蛛目 Amblypygi 蜘蛛目 Araneae 盲蛛目 Opiliones 須腳目 Palpigradi 寄蟎目 Parasitiformes 擬蠍目 Pseudoscorpionida 節腹目 Ricinulei 疥瞞亞目 Sarcoptiformes 裂盾目 Schizomida 蠍形目 Scorpiones 避日目 Solifugae 恙蟎亞目 Trombidiformes 有鞭目 Uropygi

蜘蛛綱同昆蟲係好易分－蜘蛛綱嘅物種有 8 隻（或 4 對）腳，昆蟲淨係得嗰 6 隻（3 對）。

蜘蛛綱嘅品種大部份食肉，有啲蜘蛛綱嘅物種係有毒，有啲對人畜有害。

分類

• Trigonotarbida - extinct
• Amblypygi - "blunt rump" tailless whip scorpions with front legs modified into whip-like sensory structures as long as 25 cm or more
• Araneae - spiders (40,000 species)
  • Mesothelae - very rare, basal spiders, with abdomen segmented and spinnerets median
  • Opisthothelae - spiders with abdomen unsegmented and spinnerets located posteriorly
    • Araneomorphae - most common spiders
    • Mygalomorphae - tarantulas and tarantula-like spiders
• Phalangiotarbida - extinct
• Opiliones - phalangids, harvestmen or daddy-long-legs (6,300 species)
• Palpigradi - microwhip scorpions
• Pseudoscorpionida - pseudoscorpions
• Ricinulei - ricinuleids, hooded tickspiders
• Schizomida - "split middle" whip scorpions with divided exoskeletons
• Scorpiones - scorpions (2,000 species)
• Solifugae - solpugids, windscorpions, sun spiders or camel spiders (900 species)
• Haptopoda - extinct
• Uropygi - whip scorpions, with first legs modified as whip-like sensory organs and with a long thin tail at end of abdomen (100 species)
• Acarina - mites and ticks (30,000 species)
  • Acariformes
    • Sarcoptiformes
    • Trombidiformes
  • Opilioacariformes
  • Parasitiformes - holothyrans, ticks and mesostigmatic mites

蜘蛛綱大約有 110,000 品種，可能有好多未有人發現嘅。