Also Dr Seow i'd like to apologise for sounding rude; i probably misconstrued your tone as being condescending when i was asking a genuine question to clarify matters, which is why i reacted.
I realised after looking at this key and discussing the matter with others, that because of the poor wording, it is actually not easy to understand what they mean by how the vein originates and in practice it is also not easy to see where the vein originates. And that's just one way of interpreting it
I think it's best to just rely on the dorsal characters, which are always trustworthy. The key probably needs to be reworded in a manner that is unambiguous, so that these diagnostic characters will also be useful on the ventral side
I'm gonna leave this for now
