Sea scorpions (Eurypterida, Chelicerata) of the Lower Devonian (~400 Mya) lived as large, aquatic predators. The structure of modern chelicerate eyes is very different from that of mandibulate compound eyes [Mandibulata: Crustacea and Tracheata (Hexapoda
Water scorpions can be found in slow moving streams or ponds throughout the world, particularly in warmer regions. Globally, scientists have described 270 species of water scorpions. Just a dozen species inhabit the U.S. and Canada, most of which belong to the genusRanatra. Sources Borror and...
The central nervous system (CNS) is one of the most important organ systems in animals, so ensuring that it is supplied with nutrients and oxygen is a crucial matter. In arthropods, the central nervous system consists of a 'syncerebrum' and a number of free segmental ganglia which are situa...
One of the manifestations of biophobia (and biophilia as well) may be, for example, the biologically prepared learning widely discussed by Seligman [4], which is characterized by extraordinarily short reaction times to stimuli that might pose a potential danger to the person. Another intriguing pi...
This feature allows easy the collection of scorpions, as they are nocturnal animals. The UV lamp is also a measure of security in areas harbouring dangerous species. The physiological role of this fluorescence is still discussed. Internal insemination is performed after a delay, which is sometimes...