Caudal mucous pit
![Ovachlamys fulgens (family Helicarionidae) with caudal horn on the tail end of the foot.](/Images/godic/202501/03/Ovachlamys_fulgens_32732.jpg")
![Drawing of the tail end of the body of Geomalacus maculosus showing supra-pedal grooves and triangular caudal mucous pit.](/Images/godic/202501/03/Geomalacus_maculosus_52732.jpg")
![Dorsal view of Arion vulgaris shows caudal mucous pit on its tail end.](/Images/godic/202501/03/Arion_lusitanicus,_Adultform2732.jpg")
![Arion rufus shows caudal mucous pit on its tail end.](/Images/godic/202501/03/Rød_skogsnegl2732.JPG")
The caudal mucous pit, or caudal mucous horn, is an anatomical structure on the tail end of the foot of various land snails and slugs, terrestrial pulmonate gastropod mollusks.
The function of this pit is the resorption of mucus when the gastropod is moving (see also Muratov 1999).