A group of marine tardigrades have specialized in eating the cells of sponges. They have adapted to become immune to the sponge's poisons, giving them practically infinite food and shelter. Most species of Sponge Eating Tardigrade eat the cells of only one species of sponge. Large mature sponges can have hundreds of Sponge Eating Tardigrades and still be able to grow them back faster than they're being eaten. Young sponge colonies however are susceptible to tardigrade infestations and can be eaten to death. This new animal group is vital to the reef ecosystem, successfully controlling sponge populations to a degree. This allows other reef builders to establish territory.

Slingshot worms are a large benthic nematode species that lives around coasts all over the world. They filter feed using an extended pharynx with a mucus net between two throat protrusions. Some may also build tubes for shelter out of surrounding sand grains and pebbles. The worms broadcast spawn on summer nights, their planktonic larvae are very similar to their parents.

The Veinverm comes from a group of slingshot worms that moved deeper into the ocean. The secrete a calcified cuticle for protection and support. The worms will typically live attached to reef rocks in tropical and cold water environments. They have a mucus coated, eversible, branched pharanx for filter feeding. Veinvermi grow in a curved posture with the anus and reproductive organs pointed away from the mouth, most species broadcast spawn though deep sea varieties will practice wormbagging (the larvae grow inside the adult and eat their parent). The nematode's larvae are planktonic, once they reach adulthood they will settle on a hard surface and shed their final cuticle. In their soft state they will secrete mucus to stick to the rock and then grow their calcified skeleton in these few critical days. The larva's mucus is toxic but some predatory clownworms are immune to it. Adults can live for many years and produce millions if sex cells in a lifetime.

Grorgs are typically microscopic nematodes with specialized stylets and suction-cup faces used to suck blood and/or other fluids from larger animals. Grorgs can either be external or internal parasites. The majority if not all Grorg species correspond to one other host animal species.

Xenacoelomorph diversity. The simpler flatworms have diversified quite a bit despite the existence of more complex animals, though most do not exceed 15 centimeters. The Limpacoelomorphs have evolved a simple blind gut comparable to cnidarians, same goes for the Deepstaria worms but not the rest of Platytoda.

○ Platytoda

• Enigma worms (center left) are a small colorful group similar to the nemertean Clown Worms, mainly differentiated by diets and size. They are exclusive to tropical reefs and most commonly consume specific species of Clownworm, other Enigma Worm, coral, Colonifer, or other sessile invertebrates. They possess protrusions for chemical detection and eye spots to sense light. All species are hermaphrodites and will strangle each other to impregnate their partner during copulation, sometimes resulting in splitting.

• Fork Feathers (Top left) are closely related to the Enigma Worms, their main difference is the Feather's hooked tentacles. The group mostly contains ectoparasites which attach to other organisms by sinking their hooks into their skin. They reproduce by broadcast spawning, feed by filter feeding through the skin, and have planktonic larvae. Some may also live inside the digestive systems of other organisms. No species consume blood.

• Deepstaria worms (bottom center) are a mainly deep sea group that live a peaceful solitary life style. The worms will consume marine snow or small prey depending on species and aren't preyed on often due to lack of predators and nutritional value. They broadcast spawn and produce offspring identical to the adults.

○ Limpacoelomorpha

• Calcified Limpacoels (right center) are xenacoelomorphs which secrete a calcified shell and for the most part live on marine rocky coasts. They fill niches analogous to chitons or limpets on Earth, breaking down algae on rocks with enzymes. Though it lacks an anus, their digestive system is complex and contains many branches and chambers. Under the shell they have furled skin for oxygen absorption as well as excretory pores to filter waste and produce sex cells. Most species will broadcast spawn close to each other during high tide. Larvae are either planktonic, adult-like, and/or fully marine only to become coastal later in life.

• Leather Limacoelomorphs (top right) are the most complex of the xenacoelomorph descendants. Unlike their shelled relatives, their outer covering is leathery in texture and clear. Most of the group has retained symbiotic algae and uses it to supplement their diet which also includes microscopic organisms, bark, fungi, and terrestrial algae. To survive on land, they spend half of their time in wet damp places and the other half out in the sun to gather algal nutrients using the leather shield for protection. To reproduce, hundreds will gather on a log or stem and exchange sex cells through their sides. Larvae lack a shell and need to stay under logs and rocks to avoid desiccation. Freshwater varieties do not need to worry about dehydrating, but do need great camouflage to protect themselves against motifers and croissant worms.

Attachiferans are microscopic parasitic Loriciferans that afflict Motifers. They attach themselves on to the gill branches of the Motifers and filter feed from the water that's brought to them. They usually do not negatively affect their hosts but can suffocate them if they gather in extraordinary numbers. Attachiferan larvae are planktonic and have low chances of making it to adulthood. Once in a blue moon, they reach their hosts and begin spewing tons of sex cells into the water. Some of which create larvae which typically try to stay inside the Motifer's gill cavity without a risk of being eaten.

Hydrothermal vent environments have not changed much since the end of the Neoediacaran due to these ecosystems functioning separately without the surface's influence. However, the constant shift of tectonic plates and slight differences in water composition overtime require that animals continue to adapt to an ever changing biosphere. Clampifers, croissant worms, and ephyrazoans are all still successful and diverse here in the Rhizophorean vents, though other groups have taken refuge in these nutrient-rich waters. In particular, the arthroteans and sponges have diversified and conquered the hydrothermal vents. The fuzz sponges for instance are a successful group of soft demosponges with chemosynthetic bacterial symbionts. Long filaments with spicules at the base grow on the face of the colony facing toward hydrothermal gasses in order to collect nutrients. All fuzzy sponges lack filter feeding cells and rely entirely on their bacterial symbionts for food. The growth of fuzzy sponge colonies on hydrothermal vents can sometimes smother their openings, preventing other animals like clampifers from settling and growing onto these structures.