Arthropod leg

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, pl.: coxae), trochanter, femur (pl.: femora), tibia (pl.: tibiae), tarsus (pl.: tarsi), ischium (pl.: ischia), metatarsus, carpus, dactylus (meaning finger), patella (pl.: 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[1] but modern arthropods have eight or fewer. It has been argued[2][3] 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.

In arthropods, each of the leg segments articulates with the next segment in a hinge joint and may only bend in one plane. This means that a greater number of segments is required to achieve the same kinds of movements that are possible in vertebrate animals, which have rotational ball-and-socket joints at the base of the fore and hind limbs.[4]

  1. ^ Kukalova-Peck, J. (1992). "The "Uniramia" do not exist - the ground plan of the Pterygota as revealed by Permian Diaphanopterodea from Russia (Insecta, Paleodictyopteroidea)". Canadian Journal of Zoology. 70 (2): 236–255. doi:10.1139/z92-037.
  2. ^ Fryer, G. (1996). "Reflections on arthropod evolution". Biol. J. Linn. Soc. 58 (1): 1–55. doi:10.1111/j.1095-8312.1996.tb01659.x.
  3. ^ Schram, F. R. & S. Koenemann (2001). "Developmental genetics and arthropod evolution: part I, on legs". Evolution & Development. 3 (5): 343–354. doi:10.1046/j.1525-142X.2001.01038.x. PMID 11710766. S2CID 25997101.
  4. ^ Pat Willmer; Graham Stone; Ian Johnston (12 March 2009). Environmental Physiology of Animals. John Wiley & Sons. p. 329. ISBN 978-1-4443-0922-5.