Proposal (663) to South American Classification Committee
Change English name of Ramphastos ambiguus
Our current Note under Ramphastos ambiguus, which we call ‚ÄúBlack-mandibled Toucan‚Äù, is as follows:
25. Called "Yellow-throated Toucan" by Haffer (1974), Short & Horne (2001), Short & Horne (2002b), and del Hoyo & Collar (2014).¬† Proposal badly needed.
The reason for the different English names is that the taxon swainsonii has been treated as a separate species by many authors, and under that taxonomic treatment (e.g. Meyer de Schauensee 1970), ‚ÄúBlack-mandibled Toucan‚Äù is an appropriate name.¬† However, treatment of swainsonii as a subspecies of R. ambiguus, following Haffer (1974), renders ‚ÄúBlack-mandibled‚Äù misleading because swainsonii has a reddish mandible.¬† When treated as separate species,¬† ‚ÄúBlack-mandibled‚Äù referred nicely to the main difference between ambiguus (including abbreviatus) and swainsonii, which was known as ‚ÄúChestnut-mandibled Toucan‚Äù.¬† See our Note 24 for taxonomic history.
The authors cited in Note 25 used ‚ÄúYellow-throated‚Äù for broadly defined R. ambiguus ‚Äì all three subspecies including swainsonii have yellow throats ‚Äì and we should follow this.¬† This also leaves the ‚Äú-mandibled‚Äù names as referring only to the two-species treatment.
Van Remsen, December 2014
Comments from Zimmer: YES. "Black-mandibled Toucan" ceased to make any sense once swainsoni was lumped.‚Äù