Hatschek's pit

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.[2]

References

Jefferies, R.P.S. (December 1, 1986). The Ancestry of the Vertebrates. London, England: Intercept Ltd.
Goodrich, Edwin S. (1934-01-01). "Memoirs: The Early Development of the Nephridia in Amphioxus: Introduction and Part I, Hatschek's Nephridium". Journal of Cell Science. s2-76 (303): 499–510. doi:10.1242/jcs.s2-76.303.499. ISSN 1477-9137.

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[1] Jefferies, R.P.S. (December 1, 1986). The Ancestry of the Vertebrates. London, England: Intercept Ltd.

[2] Goodrich, Edwin S. (1934-01-01). "Memoirs: The Early Development of the Nephridia in Amphioxus: Introduction and Part I, Hatschek's Nephridium". Journal of Cell Science. s2-76 (303): 499–510. doi:10.1242/jcs.s2-76.303.499. ISSN 1477-9137.