Overview
Taxonomy
The Subphylum Arachnomorpha is a member of the Phylum Arthropoda. Here is the complete "parentage" of Arachnomorpha:
- 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
- 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 Subphylum Arachnomorpha is further organized into finer groupings including:
- Infraphylum (2): Cheliceriformes · Trilobita
- Superclass (3): Chelicerata · Emeraldellida · Sidneyiida
- Class (5): Arachnida · Eurypterida · Pycnogonida · Trilobita · 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]
Trilobita
Trilobites (, /'tr?l?ba?t/; meaning "three lobes") are a well-known fossil group of extinct marine arthropods that form the class Trilobita. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (526 million years ago), and they flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, almost all trilobite orders, with the sole exception of Proetida, died out. Trilobites finally disappeared in the mass extinction at the end of the Permian about 250 million years ago. The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years. [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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