See text Armigatus is an extinct genus of marine clupeomorph fishes belonging to the order Ellimmichthyiformes.

[1] These fishes lived in the Cretaceous (Albian to Campanian, about 103-72 million years ago); their fossil remains have been found in Mexico, Europe, the Middle East and North Africa, suggesting the genus ranged across the Tethys Sea.

[2] The Latin generic epithet Armigatus, means bearer of armor.

The specific epithet brevissimus signifies "shortest, smallest".

Armigatus has an osteoglossid-like tooth patch, a large foramen in the anterior ceratohyal and a series of subtriangular dorsal scutes, giving rise to their scientific name.