Probably the Trygon/Mawloc, these tower above any other Tyranid in your army.
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you order unit fraction like this by smallest to biggest or biggest to smallest
Any shape can be the biggest - as long as it is the biggest.
There is no such thing as the "biggest longer".
The adjective 'biggest' is the superlative form for the adjective 'big': big, bigger, biggest
there is no biggest number.