An insect leg

The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. In the most recent common ancestor of modern arthropods, the legs may have had up to eleven segments each, but modern arthropods have eight or fewer. Insects have only five segments per leg, with the last one, the tarsus, being divided into several tarsomeres. An appendage is, in general, an external body part that projects from the body, or a natural prolongation or projection from a part of any organism. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - trilobites (extinct) Subphylum Chelicerata Arachnida - spiders,scorpions, etc. ... Sheep walking along a road Walk redirects here. ... The most recent common ancestor (MRCA) of any set of organisms is the most recent individual which is an ancestor of all of them. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - trilobites (extinct) Subphylum Chelicerata Arachnida - spiders,scorpions, etc. ... Classes & Orders See taxonomy Insects are invertebrate animals of the Class Insecta, the largest and (on land) most widely-distributed taxon within the phylum Arthropoda. ...