They are rare enemies that only appear in Super Metroid.
 Super Metroid
Unlike the Metroids, they are not invunrable to regular beam weapons and are far weaker than real Metroids.
While they retain the power draining ability of Metroids, Samus can escape from their grip with no ease.
It is unknown if they where produced in Maridian labs which is why they are only located there, or dumped there when deemed a falilure.
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