Ammonites with evolute, serpenticone to cadicone shells with ribs, sometimes with tubercules.

Reynesocoeloceratinae possess two major secondary lobes in dorsal side of external saddle.

This saddle is not divided this way in Dactylioceratinae, while lateral lobe is deeply trifid.

Reynesoceras oldest member of Dactylioceratinae evolved in upper Pliensbachian from Cetonoceras, or Prodactylioceras.

This subfamily died out in middle Toarcian, during Variabilis zone.