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"survival" should have a period at the end.
Is there only one "titanic baleen hunter" to justify use of the singular?
Some Minifee are poisonous. Do any of those have adaptations to poison, or do they eat non-poisonous varieties?
Did you mean "planktoids"? (Which isn't a word, but looks more like one.)
Does this replace the Gilltail itself? I'm surprised the original Gilltail has lasted so long.
Are these nocturnal or diurnal?
How many eggs do they make? Could you mention a few predators? Do they all exist in one polar area, or both? Do they have any sort of courtship? Do they breed in early, mid, or late summer? Do they have any variations in beak shape for their diets, or do they all have roughly the same omnivorous diet? Do they eat mostly flora, mostly fauna, or a mixture? Do they have any favorite foods?
Its thermoregulation is "exothermic", which seems odd. Did you mean "ectothermic"? If so, how do they live in polar waters? Antifreeze proteins, perhaps?
The description does seem rather short for a macro genus group.

This is a good idea. "Basal genera" of conservative body forms should be a more common phenomenon. I like these guys. I was actually thinking of doing a genus group like this for the shieldworm (the ancestor of the pedesorms, which I found was still extant) just before this was posted.

But the description is fairly short, other than that it looks pretty good as a concept.

Yeah it's a bit rough because there's not too much to work with off the ancestor, description-wise. I'll elaborate something

Are the newer additions good?