Scintillating scotoma is the most common visual aura preceding migraine and was first described by 19th-century physician Hubert Airy (1838â1903). It is often confused with ocular migraine, which originates in the eyeball or socket.any variations occur, but scintillating scotoma usually begins as a spot of flickering light near or in the center of the visual field, which prevents vision within the scotoma area.
Spider monkeys live in a biome with many trees. They move around by swinging from tree to tree. Spider monkeys do not build a nest or take shelter in a cave. Instead, they sle â¦ ep high up in a tree on a wide branch. Spider monkeys mostly eat fruits and nuts.
Japanese spider crab (Macrocheira kaempferi), the largest crab alive, found on the bottom of the Pacific Ocean. Portly spider crab (Libinia emarginata), a species of crab found in estuarine habitats on the east coast of North America.Hyas, a genus of spider crabs, including the great spider crab (Hyas araneus), found in the Atlantic and the North Sea. Maja squinado, sometimes called the European spider crab.o, spider crabs are not spiders (terrestrial, and of the arachnid  class) but are crustaceans (Japanese spider crabs are strictly  aquatic). They are, however, the largest â¦ species of crab reaching  about 3.8m (12 ft) across. 1 person found this useful.