In the lancelet, Hatschek's pit, not to be confused with Hatschek's nephridium, is a deep ciliated fossa on the dorsal midline of the buccal cavity (the region of the gut behind the mouth).
[1] Among other things, it secretes mucus which entraps food particles from the water.
It is named after Berthold Hatschek, an Austrian zoologist who worked on the lancelet.
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