Does anyone know the easiest way to differentiate morphologically Caribbean reef octopus (Octopus briareus) and common octopus (Octopus vulgaris)?

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Manuel Nande

I think that it's Octopus vulgaris, especially by the size of the mantle

Franz Cardoso

Octopus vulgaris is more likely, by the size of the mantle, eye size, and umbrella

Ricardo Pliego-Cárdenas

Estoy de acuerdo con Manuel. Ademas algo caracteristico del genero Octopus es el patron de parches y surcos lo que le da la apariencia de estar reticulado. Octopus briareus actualmente no pertenece al genero Octopus.

Godfried Van Moorsel

The reticulated pattern identifies this Octopus vulgaris indeed. I also think the horizontal stripe through the eyes is not present in Octopus briareus.