Blobsquid

The blobsquid has split from it's ancestor, it's body having adapted to the abyssal waters of the ocean. It has grown dramatically smaller, losing much of it's body length. It's tentacles have shortened, but have become extremely thick and muscular, and have developed minuscule hooks along their length, so as to further decrease the chance of snagged prey escaping. Another noticeable change is the development of several false bioluminescent eyespots along the blobsquid's body, which serve multiple purposes. First, they disguise the blobsquid's true eyes, tricking predators into attacking non-vital spots. Secondly, they attract the blobsquid's prey close to it, since it's inky body is invisible against the black backdrop of the water. The blobsquid has also evolved a swarming behavior, causing hundreds to coalesce en masse, turning the black void of the abyssal ocean into a sparkling, glittering galaxy. However, the most important change is it's breathing mechanism, which involves a porous head-sac on it's body, which absorbs water and squeezes it through fine filters, which collect oxygen and diffuse it throughout the blobsquid's body. The sac is constantly clenching and unclenching to collect oxygen from the oxygen-deprived waters of the deep. The blobsquid has changed the way it breeds. When the breeders meet a carrier, they impregnate it multiple times. Once a month, the carrier releases all the eggs it has been carrying at once, flooding the waters with hundreds of microscopic orbs of life. Several thousand of these are doomed to die, but the ones that hatch soon form their own swarms and repeat the process.