• Webster's Revised Unabridged Dictionary
    • n. pl Arctisca (Zoöl) A group of Arachnida. See Illust. in Appendix.
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Century Dictionary and Cyclopedia
    • arctisca The water-bears, or bear-animalcules, otherwise known as the Tardigrada, Macrobiotida, or Colpoda, a group of uncertain value and position, formerly associated with the rotifers, but now usually considered an order of Arachnida, and located in the vicinity of the Acarida. They are microscopic aquatic creatures, living in moss and wet sand, often in company with rotifers. They have a vermiform body, with four pairs of very short feet terminated by hooked claws, no distinction of cephalothorax and abdomen, and a suctorial mouth with two stylets, resembling that of a tick or mite. The young usually have the same number of legs as the adult. The arctisca are mostly hermaphrodite, and are oviparous. They are represented by a single family, Macrobiotidæ, of which Macrobiotus is the leading genus.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. bear