Invertebrate Anatomy

noun a plural form of the noun 'acicula', which refers to a needle-like structure found in certain organisms

• The aciculae on the pine tree's needles help protect it from predators.
• I accidentally pricked myself on one of the aciculae while gardening.
• Watch out for those sharp aciculae, they can really hurt if you're not careful.
• Her words were like aciculae, piercing through his defenses and leaving him vulnerable.

noun A term used in zoology to refer to a group of jellyfish that lack tentacles

• The acraspedote jellyfish lacks tentacles and instead has a smooth bell margin.
• I learned that acraspedote jellyfish are interesting because they don't have tentacles.
• Those acraspedote jellies are so weird without tentacles!
• Being an acraspedote in a sea of tentacled creatures, she stood out in her uniqueness.

noun a specialized region of the body in certain marine invertebrates, such as sea anemones and jellyfish, that contains the mouth and tentacles

• The actinosoma is the central disc of a sea star, from which the arms radiate.
• Did you know the actinosoma is the main body part of a sea star?
• Check out the actinosoma on that sea star, it's pretty cool.
• The actinosoma can be seen as the heart of the sea star, connecting all its arms together.

adjective relating to or having actinostomes, which are the openings of radiating canals in certain marine invertebrates

• The actinostomal structure of the organism is crucial for its feeding process.
• I heard that the actinostomal thingy helps the creature eat better.
• That actinostomal setup is pretty neat, huh?
• The actinostomal design of the machine allows it to efficiently process information.

noun a class of marine animals that includes sea anemones and corals

• The actinozoan is a type of marine animal that includes corals and sea anemones.
• I saw a cool actinozoan while snorkeling in the reef.
• That actinozoan is totally rad, dude!
• Her colorful personality was like an actinozoan, vibrant and captivating.

noun a plural form of the noun actinula, which refers to a small, specialized zooid in certain colonial marine invertebrates

• The actinulas of the jellyfish are responsible for capturing prey.
• Check out the tiny actinulas on this jellyfish, they're so cute!
• Those actinulas on the jellyfish look like little tentacles waving around.
• The actinulas of the organization are the young interns who bring fresh ideas to the table.