The part of the digestive system that excludes the hepatobiliary system.
Comment:
[homology-note] "All metazoans (with degenerate exceptions) have some sort of digestive cavity with a means of entrance to and exit from it.[well established][VHOG]" xsd:string {date_retrieved="2012-09-17", external_class="VHOG:0000412", ontology="VHOG", source="ISBN:978-0721676685 Sherwood Romer A and Parsons T, Vertebrate body (1977) p.3", source="http://bgee.unil.ch/"}