Are "none-of-the-above" species classifications possible?

Let's not delve into specific genuses, families, orders etc.
Broaden your definition of "classifications" to words like "mammal" or "fish", "crustacean" or "avian".

Science fiction depictions of species often resemble Earthlike categories - there will be some variation of a mammal, or some slightly altered fish, or maybe crabs with an extra pair of arms - but generally these categories (classes, etc) are adhered to.

Is there a good reason for this, or are there scientifically plausible, drastically different "categories" of organisms that evolution may produce?

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Are "none-of-the-above" species classifications possible?

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