Orders within this class are distinguished by the shape and function of the pedipalps, and some members of this class take in oxygen through soft overlapping flaps inside the abdominal cavity known as book lungs.
Animals in this class have bodies that consist of a prosoma and opisthosoma (oh-PISS-thoh-soh-muh), and the largest of them that ever lived were aquatic species called eurypterids (yoo-RIHP-tuh-ridz). Orders within this class are distinguished by the shape and function of the pedipalps, and some members of this class take in oxygen through soft overlapping flaps inside the abdominal cavity known as book lungs. Apulmonate members of this class include the Acari, which consists of mites and ticks. The species Androctonus in this class can kill humans with a neurotoxin; that species is better known as the fat-tailed scorpion. More famous for the ability of some of its members to spin silk, name this class that includes harvestmen and spiders.
Animals in this class have bodies that consist of a prosoma and opisthosoma (oh-PISS-thoh-soh-muh), and the largest of them that ever lived were aquatic species called eurypterids (yoo-RIHP-tuh-ridz).
{Arachnida} [or {Arachnids}]