Jellyfields

As a result of hypoxia and algae blooms in the Holocene, Moon Jellyfish populations boomed. The increase in population and lack of predators provided a lifeline for many reef-dwelling species who lost their entire ecosystem. Eventually, the jellyfish and the colonizing species would form a new ecosytem, the Jellyfields. Jellyfields are pelagic traveling ecosystems that are found worldwide. The largest threats to jellyfields are storms, genetic isolation, and winding up in unfavorable situations like beaching and traveling into a toxic algal bloom. The only thing that prevents the jellyfield ecosystem from completely collapsing is the constant influx of creatures that are picked up along its travels. Jellyfields are also known to merge with each other along their travels. The Moon Jellyfish found in the jellyfields are larger and considerably more venomous than their ancestors. 

Peladragons

Peladragons (narevulturidae) are a small family of slugs descended from Blue Sea Dragons. They have a white underside and a light blue topside. They measure in at 3 inches in length and have 1 inch long cerata that fan out to half an inch in length.

Unlike their ancestors, Peladragons are more motile. The six cerata are less fanned out and more muscular to slowly row across the oceans surface. Their diet consists of dead jellyfish and dead fish that float on the surface. They have a sharp radula that is used to shred through their prey. Rather then float by storing gas inside of a sac in their stomach, the sac has transformed into what is essentially a life jacket. Peladragons float upside down due to their swim bladder's position near the stomach as well as to keep their countershading from failing.

They store nematocysts from the jellyfish they eat inside of their cerata. When predators approach them, they can receive painful and possibly deadly stings. Nematocysts are also used in competition with rivals over mates. Both Peladragons carry eggs and will generate mucus to attach the eggs to their stomachs. They lay about 900 tiny eggs and only one or two of the larvae will make it to adulthood.

Gulprays

Bat rays were the only survivor of the Eagle Ray family after the Holocene extinction. One of their few descendants are the Gulprays (petrabuccadae) in the jellyfields. They have a 7 foot wingspan and a length of 7 feet, which includes the 2 foot long tail. Their underside is white and their topside is a light blue and gray.

Their diet consists of small medusas. In order to adapt to the stinging, they have a very thick layer of mucus coating their skin. Their mouth is covered in thick plates made of enamel that evolved from their previous jaw structure. Once they suck up a jellyfish, they bite down to crush the tentacles and the cnidoblasts so that they wont be stung internally. Their mouth has also shifted to the front of their bodies like other fish.

Their mating season is in spring and litters range from 7-12 pups. Only 2-3 pups live to adulthood. The pups recieve a large amount of parental care and are given training for how to deal with eating jellyfish and how to utilize their venom. The toxins from the moon jellies are stored in the barb and is strong enough to paralyze a human.

Tentaclowns

Tentaclowns (filumaccus) are a genus of descendants of ocellaris clownfish found in the pacific jellyfields. They measure in at 2 inches in length and come in a blue-violet color with gray stripes. They were added into the jellyfield ecosystem when they sought protection after their anemones were killed off in the extinction. They are able to survive the stinging cells due to having them a thicker slime coat. Their morphology is less pronounced, with smaller anal, pectoral, and pelvic fins. A slight increase in size and strength of the tail makes the Tentaclowns faster in the water to make up for the decrease in fin size. 

Tentaclowns live inside of large jellyfish in a mutualistic relationship. Tentaclowns act as lures for the jellyfish to catch prey and the fish get the leftovers of whatever fish or mollusc gets caught. They live in colonies of up to 100 tiny clownfish in an almost eusocial way. The "queen" is the only female and she selects her mate of choice from the males. If the male dies, another will take his place; if the queen dies, her mate will become female and take her place. The queen and her consort's only purpose is to reproduce. The other members of the colony work to serve the queen and protect the offspring so that the colony will survive. The other males are infertile until they are chosen to mate with the queen. They serve certain roles like scouts, scavengers, mouthbrooders, and egg-carriers. The colonies will frequently absorb other members of defunct colonies to prevent inbreeding. A colony is considered defunct once it loses it's jellyfish, which causes the colony to collapse.