 ::The overwhelmingly large genus Geochelone was split up over a decade ago and this is now followed. The checklist when looking for justification does require you to have all versions to follow it along, the 2007 version discusses Geochelone the 2008 and 2009 versions discuss the reasons for using Aldabrachelys over Dipsochelys and the most recent 2010 version just refers to their old discussions in previous versions. Under the rules of the ICZN the valid name is Aldabrachelys (prevailing usage) until a decision is made by the ICZN regarding the current case over this species. Cheers. 