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The term "ocellus" (plural ocelli) is derived from the Latin oculus (eye), and literally means "little eye". In insects, two distinct ocellus types exist: [9] dorsal (top-most) ocelli, and lateral ocelli (often referred to as ocelli and stemmata, respectively), most insects have dorsal ocelli while stemmata are found in the larvae of some ...
Ocelli (the plural of ocellus) are a type of simple eye, or eyespot. They are photoreceptive, but very simple; differing from complex eyes with compound lenses, ocelli cannot morph the sensation of light into a complete image, and are utilized to sense movement and the absence and presence of light.
Some reptiles, such as the sand lizard of Europe, have eyespots; in the sand lizard's case, there is a row of spots along the back, and a row on each side. [12]Many species of cat, including Geoffroy's cats, jungle cats, pampas cats, and servals, have white markings, whether spots or bars, on the backs of their ears; it is possible that these signal "follow me" to the young of the species.
The terminology used to describe insects is similar to that used for other arthropods due to their shared evolutionary history. Three physical features separate insects from other arthropods: they have a body divided into three regions (called tagmata) (head, thorax, and abdomen), three pairs of legs, and mouthparts located outside of the head ...
The pigment molecules used in the eye are various, but can be used to define the evolutionary distance between different groups, and can also be an aid in determining which are closely related—although problems of convergence do exist. [51] Opsins are the pigments involved in photoreception.
Symbolic use: Still Life with Lobster and Oysters by Alexander Coosemans, c. 1660 Practical use: cattle carcass in a slaughterhouse. Human uses of animals include both practical uses, such as the production of food and clothing, and symbolic uses, such as in art, literature, mythology, and religion. All of these are elements of culture, broadly ...
For the counters in the game, seeds, shells, small stones are all common for use. [7] As the game proceeds, each player distributes the shells over all the pits. The players may capture the shells, as permitted by the rules of the game. The rules of capture depend on the variant of the game played.
English naturalist Charles Darwin (1809–1882) presented firm evidence for it being a variety under domestication, which is now well established and accepted. It was important for Darwin to prove that it was a colour variation rather than a wild species as it was contrary to his theory of slow modification by natural selection in the wild. [ 20 ]