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  • Arthropod leg

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    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. 1. Biramous and uniramous ------------------------- Diagram of biramous leg of a trilobite; Agnostus spp. The appendages of arthropods may be either biramous or uniramous. A uniramous limb comprises a single series of segments attached end-to-end.

  • List of film and television accidents

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    This is intended to be a list of notable accidents that occurred during the shooting of films and television, such as cast or crew fatalities or serious accidents that plagued production. It is not intended to be a list of every minor injury an actor or stuntman suffered during filming. Stuntwork accounts for over half of all film-related injuries, with an average of five deaths for every 2,000 injuries. From 1980 to 1990, there were 37 deaths relating to accidents during stunts; 24 of these deaths involved the use of helicopters.

  • Fire ant

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    Fire ant is the common name for several species of ants in the genus Solenopsis. They are, however, only a minority in the genus, which includes over 200 species of Solenopsis worldwide. Solenopsis are stinging ants and most of their common names reflect this, for example, ginger ants and tropical fire ants. Many species also are called red ants because of their light brown color, though species of ants in many other genera are similarly named for similar reasons. Examples include Myrmica rubra and Pogonomyrmex barbatus. None of these names apply in all countries nor to all species of Solenopsis, nor only to Solenopsis species; for example the colloquial names for several species of weaver ants in the genus Oecophylla in Southeast Asia include "fire ants" because of their red color and painful sting; the two genera, however, are not closely related. Also, Wasmannia auropunctata is commonly called the "little fire ant".

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