The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. Many of the terms used for arthropod leg segments (called podomeres) are of Latin origin, and may be confused with terms for bones: coxa (meaning hip, plural coxae), trochanter (compare trochanter), femur (plural femora), tibia (plural tibiae), tarsus (plural tarsi), ischium (plural ischia), metatarsus, carpus, dactylus (meaning finger), patella (plural patellae).
Homologies of leg segments between groups are difficult to prove and are the source of much argument. Some authors posit up to eleven segments per leg for the most recent common ancestor of extant arthropods but modern arthropods have eight or fewer. It has been argued that the ancestral leg need not have been so complex, and that other events, such as successive loss of function of a Hox-gene, could result in parallel gains of leg segments.
Read more about Arthropod Leg: Biramous and Uniramous, Chelicerata, Crustacea, Myriapoda, Insects
Famous quotes containing the word leg:
“It is principally for the sake of the leg that a change in the dress of man is so much to be desired.... The leg is the best part of the figure ... and the best leg is the man’s.... Man should no longer disguise the long lines, the strong forms, in those lengths of piping or tubing that are of all garments the most stupid.”
—Alice Meynell (1847–1922)