Cnidarian Life Cycle Vocabulary

noun a small, tentacle-like structure found in certain cnidarians such as hydras

• The actinula is a larval form of certain hydroids that is capable of swimming.
• Have you ever seen an actinula swimming around in the water?
• I heard actinulas are like the little swimmers of the ocean.
• The actinula represents a stage of growth and development in the life cycle of hydroids.

noun small tentacle-like structures found on certain marine invertebrates

• The actinulae are specialized structures found in certain marine invertebrates.
• I read about actinulae in my marine biology class.
• Those actinulae thingies are pretty cool, huh?
• The actinulae of society are the individuals who stand out and make a difference.