Arthropods have bilateral symmetry. When divided into two equal sections, both sides of the arthropod body are mirror images of each other. More »

Types of arthropods include crustaceans, spiders and their kin, and insects. These are animals with a segmented exoskeleton and many legs. Most animals on earth are arthropods. In order to grow, arthropods need to moult ... More »

There are about a million known species of arthropods as of 2015. Estimates of the total number of arthropod species, including undiscovered ones, range from as low as 5 million to as high as 30 million. More » Pets & Animals Bugs

The characteristics of arthropods include an exoskeleton, well-developed sense organs, jointed appendages, tagmata body regions, a ventral nervous system and bilateral symmetry. Scientists believe that the ancestors of t... More »

Spanish fly is the common name for a type of beetle in the Melodiae family, also known as the blister beetle. Spanish fly is best known for its reputed aphrodisiac and medicinal properties; however, the active ingredient... More » Pets & Animals Bugs Beetles

The number of lines of symmetry a triangle has depends on the type of triangle. An equilateral triangle has three lines of symmetry, while an isosceles has one line of symmetry, and a scalene triangle has none. More »

The number of lines of symmetry of a parallelogram depends on the type of parallelogram. A non-special parallelogram does not have any lines of symmetry. This includes any quadrilateral with two pairs of parallel and equ... More »