endostyle
noun
en·do·style ˈen-dō-ˌstī(-ə)l 
: a pair of parallel longitudinal folds projecting into the pharyngeal cavity in lower chordates (such as the tunicates) that secrete mucus for trapping food particles
Example Sentences
Recent Examples on the Web Unlike spiders that spin their feeding webs, these grazers have a special organ, called an endostyle, that secretes their mucous mesh. 
Kelly Sutherland, Smithsonian, 3 May 2018
Kelly Sutherland, Smithsonian, 3 May 2018 Word History
Etymology
International Scientific Vocabulary end- + Greek stylos pillar — more at steer
First Known Use
1854, in the meaning defined above