Falcatus is an extinct genus of falcatid chondrichthyan which lived during the early Carboniferous Period in Bear Gulch bay in what is now Montana.

The same spines that were previously named P. falcatus were found on one of the morphs, identified as the male due to the presence of valvae.

[4] Other members of its family include Ozarcus from the Carboniferous of Arkansas,[5] and potentially Cretacladoides from the Cretaceous of Austria.

One is that the creatures sank to the bottom and died of asphyxiation in the oxygen poor waters, being preserved without scavenging took place.

[21] Other inverts include, mollusks like the nautiloid Tylonautilus,[22] pterioid bivalves which have been found encrusting sargassum like brown algae[23] as well as productid brachiopods,[24] Paleolimulus,[25] phyllocarids[26] and echinoderms like Crinoids, echinoids, sea stars, brittle stars and a many armed starfish called Lepidasterella montanensis.