The subfamily Reynesocoeloceratinae comprises early Jurassic ammonite genera that lived during Pliensbachian stage.

They have evolved from Metaderoceras and gave rise to subfamily Dactylioceratinae.

[1] Ammonites with depressed, cadicone, or even evolute, serpenticone shells.

Some members of this subfamily show size dimorphism.

While Reynesocoeloceratinae has on dorsal side of external lobe two major secondary lobes, this is not so in Dactylioceratinae, as there is external saddle not divided, while lateral lobe is strongly trifid.