Dark Grenchler

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Dark Grenchlers are Grenchlers that the darklings have possessed. Although they are tougher than the original animal, their shell is still vulnerable to Missile blasts. They have the common darkling weakness to Light Beam attacks as well. The spikes on the back are sharper than a Grenchler's and the horn has a blue tint to it. The Grapple Guardian is an adult Dark Grenchler.

[edit] Metroid Prime 2 Logbook Entry

"Darklings are drawn to possess vicious predators, making the Grenchler a prime candidate. Despite the added toughness gained from possession, the Dark Grenchler retains its one weakness. Remove the back shell with explosive blasts to expose its pain center, then attack the pain center to quickly dispatch the creature."

Grenchlers are amphibious predators that live in Dark Torvus Bog,  Dark Aether. They will attack anything that moves with their jaws and fire energy bursts when it can't reach its prey.

The shell on the Granchler's back is susceptible to explosives and once its shell is removed, the Grenchler is vulnerable to attack from behind. However, it is usually a better strategy to use Charge Beam shots - even the charged Light Beam or Annihilator Beam shots does more damage than missiles, and although missiles achieve a better fire rate, this usually does not mean much as the shell is usually vulnerable for short periods of time, so when fighting them it is best to keep the equipped beam charged, and attack when they become vulnerable. Interestingly Grenchlers fade away more slowly than other enemies so they can be scanned even when dead.