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The Seashore

Chaetognatha - Arrowworms

Chaetognatha - Arrowworms

Sagitta species

Up to a centimetre in length they are transparent and so easily overlooked. With care two eyes are visible and possibly food in the gut. They can be quite common in plankton samples.

They belong to an ancient group of animals and as they are so different to other animal species they are given their own phylum group, the chaetognatha. The name suggests a bristly mouth! They use this as a predator to catch prey and in turn are eaten by fish. They move by contracting longitudinal muscle in the body and are hermaphrodite.


About 50 species are known.

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