The Chaetognath Sagitta (IMAGE)

Okinawa Institute of Science and Technology (OIST) Graduate University

The Chaetognath Sagitta

Caption

Chaetognaths, or arrow worms, have a distinct jaw structure composed of dense protein matrix and a fibrous substance called chitin. These organisms display an ambiguous set of developmental and morphological features, making them difficult to categorize on the Tree of Life.

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