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From Metroid Wiki
23 June 2014
9 November 2013
5 November 2013
31 July 2013
19 July 2013
18 July 2013
23 October 2012
18 April 2012
They don't look too related to me, though it appears to be the general fan consensus.
m+19
The name "Sheegoth Prime" was apparently conjectural, and not a whole lot is known, but it's pretty obviously a third stage of the Sheegoth's life cycle, so that can at least go in a gallery.
m+99