9.3: Cnidarians Difficulty Level: At Grade Created by: CK-12 % Progress MEMORY METER This indicates how strong in your memory this concept is Practice Progress % % Practice Now MEMORY METER This indicates how strong in your memory this concept is Share Add to Library Turn In Read Practice Resources Details Loading... Notes/Highlights Having trouble? Report an issue. Color Highlighted Text Notes Show More Vocabulary Language: English ▼ English TermDefinition cnidarians Invertebrate animals including jellyfish and corals; they are characterized by radial symmetry and stinging cells called nematocysts. gastrovascular cavity Internal space that is the site of digestion and distribution of nutrients. medusa Bell-shaped body plan of some Cnidarians with mouth and tentacles facing downward. nematocyst Stinging cells characteristic of the Cnidarians. polyp Cup-shaped body plan of some Cnidarians with mouth and tentacles facing upward. Image Attributions Show Hide Details Description Covers the main characteristics of cnidarians. Learning Objectives None Related Materials Cnidarians - Advanced Cnidarians Difficulty Level: At Grade Authors: Jessica Harwood Douglas Wilkin, Ph.D. Contributors: Doris Kraus, Ph.D. Niamh Gray-Wilson Jean Brainard, Ph.D. Sarah Johnson Jane Willan Corliss Karasov Editors: Douglas Wilkin, Ph.D. Tags: Cnidarians nematocysts SCI.BIO.821.2.L.2 (1 more) SCI.LSC.821.2.L.1 Subjects: science Life Science Concept Nodes: SCI.LSC.821.2 (Cnidarians) Grades: 7 , 8 Date Created: Nov 29, 2012 Last Modified: Aug 30, 2016 Vocabulary None Save or share your relevant files like activites, homework and worksheet.To add resources, you must be the owner of the Modality. Click Customize to make your own copy.