I did some googling yesterday evening and this morning, just being curious what exactly is prompting the move of some Generas to Ceropegia. I would love to see some articles regarding precise reasons, showing the different nomenclature and why. So far I struck out, the internet is pretty much happily ignoring these changes.
Orchids are going through this constantly, especially the last ten years or so. DNA analysis shifts nomenclature faster than you can say "What the heck"
, but there are also reports of some Orchids which simply didn't fit anywhere and where just tagged on to a different genus.