[thaumasiotes]

I thought orcas were traditionally divided into three types. There is no standard for what is or isn't a "species".

But it doesn't matter at all; the difference between the taxonomic level of "sharks" and the taxonomic level of "orcas" is unimaginably large regardless of what you want to call the levels.

[oefnak]

I thought the standard was that they had to produce fertile offspring.

[thaumasiotes]

Not at all. Without even mentioning plants and bacteria, wolves are canis lupus and dogs are canis familiaris. But interfertility is often a bigger problem between two types of dog than it is between a dog and a wolf.