It is clear to me, give the tone of the debate, that the usual naming convention should apply for species, to wit, only the first word in a title should be capialized unless the word is a proper noun, which species names are not. This is in line with the usual Wikipedia practice, making an exception in this (or any other case) is only a source of heat and detracts from the work at hand.
I don't propose any big effort to "correct" articles, but just making plain that species names are not an exception to the general rule with editing changes as the opportunity arrises.
Fred