Ahh, yes the minor ranks (like subgenus, subfamily) were not linked in by Charles when he created the ORGANISM table. This was mainly because it would have doubled the amount of work and these subranks are usually the most contentious and hardest to actually get agreement on. I plan to link them in eventually but I'd like a more powerful administration tool first because, although I can automatically link in most using the checklists, there will be thousands of taxa who do not occur on a major checklist and these will have to all be tidied up manually.