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With you resoning each Hive Fleet would be a race of itself. There would be no Tyranid race.
In a way true, Tyranid is nothing more than a designation by the Imperium that encompasses a vast numer of 'sub-species'. If you saw a Ravener and a Genestealer, would you call them the same race?
At that point what defines race, evidently not species?
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One Hive Fleet would have Gaunts but as there is no communication between other Hive Fleets, as you say, then no other Hive Fleet would have developed Gaunts but something completely different.
But they all have Gaunts, at some point in the past they where one fleet.
Ants in the US and ants in France are very similar (but with divergences), and follow similar organisation. Does this mean they are still in communication?
At some point in the Tyranid past (undoubtably in another galaxy) Fleet X expanded to the point it had to diverge and separate in order to sustain all bodies- to attack multiple worlds in different systems as one system couldn't sustain the whole fleet.
At some point the Tyranids were small enough in number to be a single fleet, indeed, at some point they were likely just one sub-sect of animals on a single world.
These split fleets eventually 'set sail' for the Imperial galaxy, Behemoth hitting first, etc.
Common species like Gaunts, Warriors, etc evidently date from a time when the Tyranid fleet or species was singular.
Behemoth was annihilated, so that evolutionary tail died.
Kraken was the main one in 4th Ed and earlier, when it was defeated tendrils split into separate fleets, carrying the common species, but also evolving new ones like the Red Terror, etc.
These Splinter Fleets explain my position clearly, they could quite easily all have the same Gaunts from an earlier mother fleet, but be separate fleets.
I should stress that the above is 30% background and 70% my extrapolation of the background. The background itself being 90% Imperial conjecture.
I like to think of our conversations as two wily Ordo Xenos Inquisitors putting forward pet theories on the Tyranid menace to the Conclave-
