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[[Image:450px-Spider black yellow.jpg|thumb|right|Spider in its web]]

[[Image:450px-Spider black yellow.jpg|thumb|right|Spider in its web]]

An '''arthropod''' is an invertebrate with an [[exoskeleton]], a segmented body and jointed limbs.  Prominent groups of arthropods are the [[insect]]s, [[crustacean]]s, [[arachnid]]s ([[spider]]s and [[scorpion]]s), and the [[extinct]]  [[trilobite]]s.

An "'arthropod'" is an invertebrate animal defined by several morphological and biochemical features. Among these features are: segmented body covered by a hard [[exoskeleton]], periodically molt (a process known as [[ecdysis]]), [[tagmosis]], paired jointed appendages on varying segments, [[hemocoelic]] [[body cavity]] containing the hear, striated (for the most part) muscles, and epithelial tissue (which is usually non-ciliated).

Arthropods are classified under the [[phylum]] [[Arthropoda]] in the kingdom [[Animalia]].

Within the phylum Arthropoda are the classes commonly known as [[insect]]s, [[crustacean]]s, [[arachnid]]s ([[spider]]s and [[scorpion]]s), and the [[extinct]]  [[trilobite]]s.

[[Category:Invertebrates]]

[[Category:Invertebrates]]