Webster's Revised Unabridged Dictionary
- n. pl Araneida (Zoöl) See Araneina.
Century Dictionary and Cyclopedia
- araneida A superfamily and subgroup of the class Arachnida, now usually called an order, containing the spiders as distinguished from the mites, scorpions, and other arachnidans: practically synonymous and conterminous with Dimerosomata or Pulmotrachearia. The spiders breathe by two or more pulmonary sacs, combined or not with tracheæ. The abdomen is not segmented, and is distinctly separated from the cephalothorax; they have no antennæ, as such, but a pair of palps; they have from 2 to 8 simple eyes, and 8 legs of 7 joints each. The abdominal appendages are modified into an arachnidium or spinneret, the apparatus by which cobweb, gossamer, and other kinds of spider-silk are spun from a secretion of glandular organs. There are also always poison-glands connected with the mouth-parts. The division of the group varies with every leading writer as to number of suborders or families and their arrangement, some admitting but two or three families, others several suborders and upward of twenty families, while the diversities of detail are endless. A prime division is into Dipneumones, those having two pulmonary sacs (the great bulk of the order), and Tetrapneumones, with four; or according to the number of stigmata, those having two pairs (Tetrasticta) or only one pair (Tristicta); or according to the number of eyes, whether 2, 4, 6, or 8; or, finally, according to the way in which they move about and spin their webs. Some authors adopt three families: Araneidœ, Lycosidœ, and Mygalidœ. Also Araneidea, Araneina.