Wild animals






Other interesting subjects,
use "search for..."

English Setter Puppies Mn Maine Coon Ebay Yellow Baby Ducks Clip Art X Snake Game Bouvier Des Flandres W Potrzebie Nice Shark Cartoon Quincunx Laperm Functions Of Human Resource Management White Tiger Animal Print Ultimate Spider Man Tv Series Lizard Manatee Arrest Wolf Wallpaper Hd 1080p Penguins Catching Fish Wolf Costume For Kids Homemade Quarkxpress 9 Mountain Lion Yorkshire Terrier Vector Leopard T Strap Sandals


Latest updated pages





Description of Arachnid

´╗┐Arachnids belong to the phylum Arthropoda, and as such have the basic characteristics of this assemblage. These characteristics include having jointed appendages, an exoskeleton, an open circulatory system, and a ventral nerve cord. The Arachnida are a subgroup within the subphylum Cheliceriformes, those arthropods with a pair of primitively pincerlike chelicerae mouthparts. Arachnids are considered to have an aquatic origin, but most present-day forms are terrestrial in nature. Arachnids all have the following characteristics: a body that is divided primitively into a prosoma and an opisthosoma; a pair of chelicerae used as mouth parts, a pair of pedipalps that often end in pincerlike claws and are modified for prey manipulation and sperm transfer; four pairs of walking legs in the adult (juveniles may have three pairs) originating from the prosoma; absence of antennae; simple eyes in most; coxial glands at base of the legs and malpighian tubules extending between the hemocoels and gut tube used for excretion and osmoregulation; gut tube with diverticula; breathing accomplished by book gills (aquatic forms), book lungs, or tracheal tubes; and a dorsal heart. The following orders comprise the Arachnida: Scorpiones (scorpions), Uropygi (whip-tailed scorpions), Schizomida (schizomids), Amblypygi (whip spiders), Palpigradi, Araneae (spiders), Ricinuleids, Pseudoscorpionida (false scorpions), Solpugida (wind scorpions), Opiliones (daddy longlegs), and Acari (ticks and mites).

Thanks for description - Animal life club

Photo Gallery of Arachnid