#arachnida

• Arachnids — An alternative spelling variant for arahnide (arachnids); a major class of terrestrial or aquatic chelicerate arthropods, characterized by a body segmented into a cephalothorax and abdomen, the lack of antennae, the presence of two pairs of mouth appendages (chelicerae and pedipalps), and exactly eight articulated legs. The class includes spiders, scorpions, harvestmen, mites, and ticks, playing a vital ecological role as insect predators.
• Aranea — A historical genus of spiders originally described by Carl Linnaeus in the 18th century, which in early nomenclature encompassed most species of web-weaving arachnids. Subsequently, the designation was taxonomically reorganized, with many species redistributed into modern genera such as Araneus (orb-weaver spiders), while remaining a foundational reference in the history of biological systematics.