On the ventral side, the maxilla contacts the ectopterygoid, palatine and vomer. The teeth are tiny and thin, present on the jaws, palatine, and vomer. There are no teeth on the vomer or palatine. In the palate, the vomer is keeled. The vomer () is one of the unpaired facial bones of the skull. The jaws, vomer and tongue have villiform teeth. Additionally, freshwater eels possess small, granular teeth arranged in bands on the jaws and vomer. The lookdown ("Selene vomer") is a game fish of the family Carangidae. This species has no teeth on the jawline, but some are exhibited on the vomer. "Proganochelys" had a semi-beak like structure along with teeth fused to its vomer. Teeth are nonexistent on the palatines and vomer; which make up the hard palate. The vomer, palatines, endopterygiod, and ectopterygiods all lack teeth. The choanae are separated in two by the vomer.