cydippidea

Century Dictionary and Cyclopedia

1. An order of tentaculate Ctenophora. They have the body of spherical, cylindrical, or compressed form, with 2 simple or branched tentacles retractile within tentacular sheaths, and the meridional and stomodeal canals not produced into a peripheral-canal system. The order includes the families Mertensidæ and Pleurobrachidæ.

WordNet 3.0

1. n. ctenophores having two long pinnate tentacles