Mercaticeras is an extinct genus of ammonites belonging to the family Hildoceratidae.

The genus name Mercaticeras derives from Michele Mercati (a Tuscan physician who lived in the 16th century, superintendent of the Vatican Botanical Gardens) and ceras = horn, therefore the genus name means horn of Mercati.

The shell is averagely evolute, with a spiral that grows more rapidly in the internal whirls.

[2] Fossils of this genus can be found in Albania, Algeria, Austria, Bulgaria, Canada, France, Germany, Greece, Herzegovina, Hungary, Italy, Morocco, Portugal, Spain, Switzerland, Tunisia, Turkey.

Researchers of the Toarcian Mediterranean domain agree that Mercaticeras belongs to the subfamily Mercaticeratinae Guex, 1974 (Hildoceratidae) with genera Praemercaticeras Venturi, 1981, Pseudomercaticeras Merla, 1932, Merlaites Gabilly, 1974, Crassiceras Merla, 1932, and Pseudocrassiceras Rulleau et Jattiot, 2019.