The existence of a membrane separating the pharynx from the stomach ca... - dofaq.co
diaphragmatic

The existence of a membrane separating the pharynx from the stomach ca...

 wikipedia - 26 Sep 2020
The existence of a membrane separating the pharynx from the stomach can be traced widely among the chordates. Thus the model organism, the marine chordate lancelet, possesses an atriopore by which water exits the pharynx, which has been claimed (and disputed) to be homologous to structures in ascidians and hagfishes.[14] The tunicate epicardium separates digestive organs from the pharynx and heart, but the anus returns to the upper compartment to discharge wastes through an outgoing siphon.

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