Marine Invertebrates

noun a type of marine worm that resembles an acorn in shape

• The acorn worm is a marine invertebrate that burrows in the ocean floor.
• I saw a weird-looking acorn worm while snorkeling at the beach.
• That acorn worm is one funky critter, dude.
• The acorn worm wriggled through the sand like a tiny alien exploring a new world.

noun a larval form of a phoronid worm characterized by a band of cilia used for locomotion

• The actinotrocha is a larval stage in the life cycle of certain marine animals.
• Have you ever seen an actinotrocha swimming in the ocean? It's quite fascinating!
• That actinotrocha larva is like a tiny alien swimming in the sea.
• The actinotrocha represents the beginning of a new chapter in the animal's life.

noun Aeolosomatid - a type of marine annelid worm belonging to the family Aeolosomatidae

• The aeolosomatid is a type of marine worm that is commonly found in sandy seabeds.
• I heard that the aeolosomatid worm is really tiny and hard to spot.
• Those aeolosomatids are like little sand noodles wriggling around in the ocean.
• The aeolosomatid's movements in the sand are like a delicate dance choreographed by nature.