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Answer for the clue "Arrowworms a group of small active transparent marine worms ", 12 letters:
chaetognatha

Word definitions for chaetognatha in dictionaries

Wikipedia Word definitions in Wikipedia
Chaetognatha , meaning bristle-jaws , and commonly known as arrow worms , is a phylum of predatory marine worms which are a major component of plankton worldwide. About 20% of the known species are benthic , and can attach to algae and rocks. They are found ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Chaetognatha \Chae*tog"na*tha\, ||Chaetognatha \Ch[ae]*tog"na*tha\, n. pl. [NL., from Gr. ? hair + ? jaw.] (Zo["o]l) a phylum consisting of the arrowworms, a group of small active transparent free-swimming marine worms, of which the genus Sagitta is the ...