There is no direct significance between humans and chaetognaths. However, chaetognataha are an important part of the marine food chain, and they are used as indicators to determine the level of water from the Atlantic Ocean moving into the North Sea. Arrow worms may play a role in the oceanic distribution of tetradotoxin-producing bacteria.
1. Pterosagitta draco, 2. Sagitta enflata, S. Spadella cephaloptera, 4. Eukrohnia fowleri, B. Sagitta setosa, B. Sagitta bipunctata, l. Sagitta planc-tonis. (Illustration by Joseph E. Trumpey)
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