Chaetognath Head Anatomy
Erik V. Thuesen, Ph.D.
This figure shows the basic head anatomy of a sagittid chaetognath.
The hooks and teeth are labeled in the first figure below, and the various pores and microstructures are labeled in the second figure.

The teeth and hooks function in prey capture as shown in this figure of Flaccisagitta hexaptera eating a larval fish.

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