Draygon

Draygon is a major boss from Super Metroid. It is a sort of waterborn crustacean, with a hard outer shell and soft underbelly. Just as well, it seems to be a fully developed Evir, and even has a few hatchlings, which are present in the chamber that it dwells in. It is found in the last accessible room of Maridia. Its defeat allows access to the room which holds the Space Jump ability, and is one of the four bosses necessary to defeat in order to enter Tourian as it is depicted on the Gold Statue. This has led to the possibility that Draygon, along with Phantoon, are high-ranking Space Pirates in the same way Kraid and Ridley are. It may indicate that Draygon and Phantoon are not mindless creatures, but intelligent beings, despite their monstrous appearances.

Manual
"The Draygon has an armor-like hard shell which gives it a lot of defensive strength."

Battle Tactics
Once Samus enters the chamber, a small group of dark green Evirs will be swimming around near the floor, and will swim out of sight after a few moments. Their highly protective mother Draygon will swim in with great haste just moments later. Draygon will quickly jet back and forth in the chamber, disappearing past the walls, swimming in swift arcs. Draygon's body is nearly completely covered in a tough impenetrable shell, save for its soft underbelly, which is susceptible to Super Missiles.

Occasionally, between the swift swimming arcs, Draygon will release several dozen globs of gray mucus from its mouth once it reappears, resembling Boyons. These can attach themselves to Samus, slowing her movement and allowing Draygon to grab onto her and deal massive damage with its claws and tail.

Throughout the battle, Draygon's stomach will gradually change from a pale yellow to a very bright crimson, depending on how much damage Samus has inflicted. Once defeated, Draygon will begin to self-destruct, releasing its final cries and floating down to the seafloor. Its children will slowly reappear and carry off the body, without a sound.

Samus can defeat Draygon easily by destroying the turrets on the walls. By allowing Draygon to grab her, she can then fire the Grapple Beam at the sparking wreckage of the turrets. The Power Suit will act as an electricity conductor, transferring a high voltage charge of electricity into Draygon's body. After a few moments of intense shocking, Draygon's health will rapidly deplete to nothing, and end the battle rather quickly. Note that the electrocution of Draygon will also cause a noticable amount of damage to Samus as well.

Another method can be used to defeat Draygon, but Samus needs the Plasma Beam and X-Ray Scope. She must simply fire a shot while having the Scope selected, and keep turning the Scope on and off quickly. Every shot should deal massive damage, taking Draygon down.