""Gavia" portisi" from the Late Pliocene of Orciano Pisano, Italy, is known from a cervical vertebra that may or may not have been from a loon. If so, it was from a bird slightly smaller than the common loon. Older authors were quite sure the bone was indeed from a "Gavia" and even considered "G. concinna" a possibly junior synonym of it. This is now regarded as rather unlikely due to the quite distinct range and age. The Early Pliocene "Gavia" skull from Empoli (Italy) was referred to "G. concinna", and thus could conceivably have been of ""G." portisi" if that was indeed a loon. The holotype vertebra may now be lost, which would make ""G." portisi" a "nomen dubium".