Talk:New Zealand pea crab

What about Pinnixia?
Is this the same as the Pinnixia pea crab? When did the classification change? Was it universal? I.e. what if some biology student was told by his teacher about Pinnixia, but really couldn't find an article about it, because no-one told him about the change? (Biology teachers should keep up with every little change is impractical, maybe). Does this apply to Wikipedia on a larger scale? Just asking.