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Free-swimming worms with developed sense organs
Answer for the clue "Free-swimming worms with developed sense organs ", 8 letters:
errantia
Word definitions for errantia in dictionaries
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Errantia \Er*ran"ti*a\, n. pl. [NL., fr. L. errare to wander. See Err .] (Zo["o]l.) A group of ch[ae]topod annelids, including those that are not confined to tubes. See Ch[ae]topoda . [Written also Errantes .]
Wikipedia
Word definitions in Wikipedia
Errantia , occasionally Aciculata , is a subclass of polychaete worms. These worms are found worldwide in marine environments and brackish water.