Surface architecture ofthe buccal cavity and the surface organization ofthe luminalmucosa ofthe oesophagus,
stomach, and intestine of the carnivorous fish M. flavolineatus from the Red Sea were studied by
using SEM. The results revealed that M. flavolineatus has four kinds ofteeth; curved-blunt, wedge-shaped,
flattened crowns, molariform and papilliform. Three types of taste buds (type I, II and III) were recorded
in the oropharyngeal cavity. It was observed that taste buds and teeth are co-located in the pharyngeal
region. Characteristic patterns of microridges of the surface cells in the oral cavity and oesophagus were
observed. Mucous cells are distributed in the lining of the mouth cavity, oesophagus, stomach, and intestine.
Characteristic patterns of mucosal folds throughout the alimentary canal, concerning oesophagus,
stomach, and intestine were revealed. Numerous gastric pits, which represents the emergence of the
gastric glands, were recorded in the anterior and middle regions of the stomach. Complex patterns of the
folds and mucous cells were recorded in the intestinal mucosa. These results were discussed with other
teleost fishes.