Overview
Taxonomy
The Superclass Chelicerata is a member of the Infraphylum Cheliceriformes. Here is the complete "parentage" of Chelicerata:
- Domain: Eukaryota
Whittaker & Margulis,1978 - eukaryotes
- Kingdom: Animalia
C. Linnaeus, 1758 - animals
- Subkingdom: Bilateria
(Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians
- Branch: Protostomia
Grobben, 1908 - protostomes
- Infrakingdom: Ecdysozoa
A.M.A. Aguinaldo et al., 1997 ex T. Cavalier-Smith, 1998 - ecdysozoans
- Superphylum: Panarthropoda
Cuvier
- Phylum: Arthropoda
Latreille, 1829 - Arthropods
- Subphylum: Arachnomorpha
Heider, 1913
- Infraphylum: Cheliceriformes
- Superclass: Chelicerata
- Infraphylum: Cheliceriformes
- Subphylum: Arachnomorpha
Heider, 1913
- Phylum: Arthropoda
Latreille, 1829 - Arthropods
- Superphylum: Panarthropoda
Cuvier
- Infrakingdom: Ecdysozoa
A.M.A. Aguinaldo et al., 1997 ex T. Cavalier-Smith, 1998 - ecdysozoans
- Branch: Protostomia
Grobben, 1908 - protostomes
- Subkingdom: Bilateria
(Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians
- Kingdom: Animalia
C. Linnaeus, 1758 - animals
The Superclass Chelicerata is further organized into finer groupings including:
- Class (4): Arachnida · Eurypterida · Pycnogonida · Xiphosura
Classes
Arachnida
Arachnids are a class (Arachnida) of joint-legged invertebrate animals in the subphylum Chelicerata. All arachnids have eight legs, although in some species the front pair may convert to a sensory function, while in other species, different appendages may grow large enough so as to appear like an extra pair of legs. The term is derived from the Greek words (ar?chne), meaning "spider". [more]
Eurypterida
Pycnogonida
Sea spiders, also called Pantopoda or pycnogonids, are marine arthropods of class Pycnogonida. They are cosmopolitan, found especially in the Mediterranean and Caribbean Seas, as well as the Arctic and Antarctic Oceans. There are over 1300 known species, ranging in size from 1 to 10 millimetres (0.039 to 0.39 in) to over 90 cm (35 in) in some deep water species. Most are toward the smaller end of this range in relatively shallow depths, however, they can grow to be quite large in Antarctic waters. [more]
Xiphosura
At least 10 species and subspecies belong to the Class Xiphosura.
More info about the Class Xiphosura may be found here.
Sources
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