The Giant Siphonophore, also called by its binomial name Praya dubia, is a 130-foot-long plankton. It is one of the world's largest invertebrates and appears in the abyssal regions of both games.
"This creature is made up of an umbrella called a swimming bell and extremely long, thread-like organs. It is not one single animal but is actually made up of a huge number of tiny organisms, making the species a living colony. Each individual organism has its own duties, such as feeding, reproducing, attack or defense, so it can cope with anything.
[Big or Small]
When people talk about plankton, miniscule creatures usually come to mind. However, this 130ft long species is actually a type of plankton. Plankton is actually defined as a floating creature that is unable to resist ocean currents and has no swimming ability; it is not related to size."
It can be found at the depth of 495 ft during the daytime in the Abyss.
Two are found in the Zahhab Region Depths during both the daytime and the nighttime, only in the South Crevasse. However, they are reportedly easier to find at night - and they are also only able to be seen after the cutscene introducing them has triggered, which only occurs at night. As such, it would be wiser to search for them after the sun has set.
These creatures are slow-moving and docile, unable to attack the player. They make a circuit from around 400 feet to 500 feet (122 meters to 152 meters) and back again as they swim - rather, drift along. In order to get this creature's trivia, the player has to take a photograph of it.
- With a body length averaging out at 130 feet (40 meters) in real life, these creatures are the second-longest sea organism out there - the longest being a creature called the Bootlace Worm, which doesn't appear in either game.
- Though this creature is not harmful to the player, they are capable of delivering stings to their prey in order to paralyze and then consume it. In real life, it is unknown if these stings are capable of harming humans.
- When brought to the surface, the Praya Dubia tends to burst. This odd manner of perishing is because its skeleton is hydrostatic, meaning that it is essentially held together with water pressure. This means that comparatively low water pressure will cause it to fall apart.
- This creature's existence has been known about since the 1800s, but its appearance (primarily its length) was more specifically categorized in 1987.