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By AluminumFox
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Fig 1 - Barbed Thallus - Thalassoprodigium Spicula
The barbed thallus is a wolf-sized thallus primarily found in swamp-like areas. When threatened, it pulls up multiple pairs of barbs tipped with a deadly neurotoxin which appears bright pink.

Fig 2 - Shearhead Thallus - Thalassoprodigium Tondendas
They swim at high speeds, tearing through any organic matter with their shear-like teeth. They can be surprisingly stealthy, sneaking up on prey until they line up perfectly.

Fig 3 - Lovushka Thallus - Thalassoprodigium Captionem - (The Depiction is on its belly and viewed from above.)
They shuffle themselves into the sediment of the water. As soon as anything swims over them, they slowly slither out of their hiding, follow their target and when they relax a bit too much, the Lovushka grabs them with its powerful side-ways jaws, acting like the mandibles of arthropods.

Fig 4 - Swarming Thallus - Thalassoprodigium Coetus
The smallest genus of Thalassoprodigium, swarming Thallus are mostly docile when alone or in pairs. However, as soon as they meet more of their species and their group count grows to more than 3, they become ravenous and aggressive. However, if sustained for more than a month by a human, it will grow to become dog-like and affectionate.

Fig 5 - Reaching Thallus - Thalassoprodigium Hastam
Ambush predators, they aren't very fast or agile at all. They hunt by waiting in dark crevices and other areas that both conceal the creature and allow it to open its jaws. When something swims past this crevice, a pair of pedipalps like those of the whip spider reach out, grabbing the prey, damaging it with those spikes and drags them back to the mouth.

Fig 6 - Constricting Thallus - Thalassoprodigium Vipera
Only named so because of their resemblance to snakes and viperfish, the Constricting Thallus are a deadly and dangerous species. While seeming slow, they can unleash high bursts of speed and easily tear apart prey. Be wary when you finally get one on your fishing platform, their serpentine body structure allows them to move as easily on land as in the water and it also allows them to continue fighting you. When grabbed on its jaw, it can shed its exterior jaws and escape. When it grabs something, its outer jaws immobilise it while the inner jaws snap vicously.

Fig 7 - Cagemouth Thallus - Thalassoprodigium Depicula
An unusually docile species of Thallus, the Cagemouth is the largest species. They are found in deep water and filter feed to gain food. Because of their mouth structure, small creatures that are too big to be eaten may be able to live within them. These pose an advantage to their host, as they will eat harmful parasites and leftovers from the giants.

Fig 8 - Dracula's Thallus - Thalassoprodigium Sanguis
Like the lampreys of Earth, the Dracula's Thallus sucks blood and other vital liquids from their host, leaving an empty husk, dry of any blood or vital liquids. Their tongue has a razor-sharp appendage, able to cut through any type of armour.

Fig 9 - Basher Thallus - Thalassoprodigium Leviathan
The most iconic and the second largest. They can swim incredibly fast, breaking bones when colliding with people. They do not possess teeth in the mouth, however, in their throats are backwards-facing spines to keep prey in after sucked in through a vacuum. Beware, they can leap out of the water and break boats with ease.
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© 2020 AluminumFox
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SmurfsAss's avatar
wowww- These are really awesome fish!! very scary, indeed, and their teeth look super sharp and deadly Excellent - Hello Kitty 
AluminumFox's avatar

ive been thinking of alien species, this came to me after watching season 1 of river monsters.

SmurfsAss's avatar
Ahhh, river monsters! That's a pretty good show, they have all kinds of deadly river fish in there, lurking about in murky depths- It's mysterious as well as entertaining, I can definitely tell that it would be a great source of inspiration!