See text Mercaticeratinae Guex, 1973 Hildoceratinae is an extinct subfamily of cephalopods belonging to the family Hildoceratidae.

Ammonites of this subfamily had shells with elliptical or quadrate whorl section with keel or tricarinate, bisulcate venter.

They can be interrupted by spiral groove in midlateral part of the shell.

While some species can be smooth, strongly ribbed ones can have tubercules.

[1] [1][2] Genera Praemercaticeras Venturi, 1981, Mercaticeras Buckman, 1913, Pseudomercaticeras Merla, 1932, Merlaites Gabilly, 1974, and Crassiceras Merla, 1932 have also been classified as belonging to a separate subfamily Mercaticeratinae Guex, 1974.