#arachnids

• Acariform — Having the form, appearance, or characteristic structure of a mite. In the hierarchical taxonomy of arthropods, the term defines organisms belonging to the superorder Acariformes, the largest and most diversified group of mites, notable for their distinct body segmentation (proterosoma and hysterosoma) and specific morphological traits of the mouthparts and legs.
• 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.
• Argas — A genus of soft-bodied parasitic ticks in the family Argasidae, lacking a chitinous dorsal shield, which primarily attack domestic and wild birds, but also accidentally mammals or humans. These hematophagous arachnids are nocturnal, hiding in the cracks of shelters during the day, and represent major biological vectors for transmitting dangerous pathogens, such as bacteria and viruses.
• Arthropod — An invertebrate animal characterized by the presence of an articulated chitinous exoskeleton and legs or appendages made of movable segments. As an adjective, the term describes an organism or anatomical structure specific to this group of creatures, which includes insects, arachnids, crustaceans, and myriapods, representing the most numerous and diverse phylum in the animal kingdom.