What is another word for Phylum Sipuncula?
Pronunciation: [fˈa͡ɪləm sɪpˈʌnkjʊlə] (IPA) 
Phylum Sipuncula, also known as "peanut worms," is a group of marine invertebrates with a cylindrical body and a retractable introvert. There are several synonyms used to refer to this phylum, including Sipunculida, Sipunculoidea, and Sipunculiformes. These synonyms indicate a classification system based on different characteristics or evolutionary relationships. Sipuncula is part of the deuterostome superphylum and shares some similarities with other invertebrate groups like annelids and mollusks. The name "peanut worm" comes from the worm's shape, which resembles a peanut when its introvert is fully extended. These worms play an essential role in marine ecosystems, serving as prey for many larger animals and participating in nutrient cycling processes.
