In biology, dactyly is the arrangement of digits (fingers and toes) on the hands, feet, or sometimes wings of a tetrapod animal. It comes from the Greek word δακτυλος (dáktylos) = "finger". Sometimes the ending "-dactylia" is used. The derived adjectives end with "-dactyl" or "-dactylous". As a normal feature
Pentadactyly
Pentadactyly (from Greek πέντε pénte "five") is the condition of having five digits on each limb. It is traditionally believed that all living tetrapods are descended from an ancestor with a pentadactyl limb, although many species have now lost or transformed some or all of their digits by the process of evolution. However, this viewpoint was challenged by Stephen Jay Gould in his 1991 essay "Eight (Or Fewer) Little Piggies", where he pointed out polydactyly in early tetrapods and described the specializations of digit reduction. Despite the individual variations listed below, the relationship is to the original five-digit model. In reptiles, the limbs are pentadactylous. Dogs and cats have tetradactylous paws but the dewclaw makes them pentadactyls. Tetradactyly
Tetradactyly (from Greek τετρα tetra "four") is the condition of having four digits on a limb, as in many amphibians, birds, and theropod dinosaurs. Tridactyly
Tridactyly (from Greek τρία tría "three") is the condition of having three digits on a limb, as in the rhinoceros and ancestors of the horse such as Protohippus and Hipparion. These all belong to the Perissodactyla. Some birds also have three toes, including emus, bustards, and quail.
Tumid lupus erythematosus  is a rare, but distinctive entity in which patients present with edematous erythematous plaques, usually on the trunk.Lupus erythematosus tumidus (LET) was reported by Henri Gougerot and Burnier R. in 1930. It is a photosensitive skin disorder, a different subtype of cutaneous lupus erythematosus (CLE) from discoid lupus erythematosus (DLE) or subacute CLE (SCLE). LET is usually found on sun-exposed areas of the body. Skin lesions are edematous, urticarialike annular papules and plaques. Topical corticosteroids are not effective as treatment for LET, but many will respond to chloroquine. LET  resolves with normal skin, no residual scarring, no hyperpigmentation or hypopigmentation. Cigarette smokers who have LET may not respond very well to chloroquine.It has been suggested that it is equivalent to Jessner lymphocytic infiltrate of the skin. See also
Lupus erythematosus
List of cutaneous conditions


== References ==