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NatureServe Explorer Species Index: Phylum Chelicerata.
Cheli. 1 i Subphylum CHELICERATA i Questo subphylum dartropodi i fa parte dei Merostomata i, oggi rappresen- tati da soli tre generi, che vivono in ambienti marini marginali.
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Acari A brief introduction to the Acari or Mites. AmblypygiAn introduction to the Amblypygi or Whip Spiders. Arachnid An introduction to the Arachnida. Arachnophobia Notes on the fear of spiders. Araneae An introduction to the true spiders. Chelicerata An introduction to the Chelicerata.
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very reduced abdomen - typically have 1 pair chelicerae (3-segmented), 1 pair ovigers, 4 pair walking legs, and simple eyes - unusual reproductive biology: males brood embryos on special legs (ovigers); only arthropod group with sole male parental care!
The 75000 species within this subphylum belong to three diverse classes. The Classes Merostomata and Pycnogonida include relatively minor, aquatic organisms, the Class Arachnida comprises the vast majority of species (74000 + ) and includes spiders, scorpions, mites and ticks.