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Tethys Shallows

🌐 Open world

A warm, shallow inland sea under a yellow sun and Earth-like gravity. Tidal mudflats meet brackish lagoons; oxygen is plentiful in the water, scarce in the thick muck.

31 species Β· 17 starting species

Mudfish

🐟 Fish

A small, hardy fish of the tidal shallows that grubs through silt for plankton and detritus.

gilled12 cmfilter-feeder
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Reed-Grazer

🦬 Grazer

A placid, broad-jawed creature that mows the algal mats coating the lagoon reeds.

algae-grazer8 cmbroad jaws
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Silt-Burrower

🦫 Burrower

A worm-like dweller of the oxygen-poor muck, sifting buried detritus from the silt.

burrowing6 cmdetritivore
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Dart-Swimmer

🐬 Swimmer

A streamlined, restless swimmer that chases plankton clouds through open water.

fast-swimming10 cmplanktivore
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Shoal-Hunter

πŸ… Predator

A patient ambush predator that lurks at channel edges and lunges at passing shoals.

predatory18 cmambush jaws
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Skip-Glider

πŸ¦… Flyer

Leaps from the water on stiffened fins, gliding over the surface to snatch drifting insects.

gliding9 cmwinged fins
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Tide-Crawler

🦎 Tetrapod

Hauls itself across exposed mudflats at low tide on four stubby limbs, gulping air.

four-limbed14 cmair-gulping
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Reed-Skater

πŸ¦— Arthropod

Skims across the lagoon's surface film on six slender legs, snatching tiny prey.

six-legged3 cmsurface-skating
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Brine Pincer

πŸ¦€ Crustacean

A small armored scavenger that sidles through tidepools cleaning up the dead.

armored carapace7 cmclawed
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Shore Spinner

πŸ•·οΈ Arachnid

Strings silk between reed stalks to snare drifting insects above the water.

eight-legged2 cmsilk-spinning
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Lagoon Squidling

πŸ™ Cephalopod

A tiny, quick-witted hunter that jets through the shallows, flushing its skin with color.

tentacled8 cmjet propulsion
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Reed Snail

🐌 Gastropod

Rasps algal films from reed stalks with a toothed radula, sheltering in a coiled shell.

coiled shell4 cmradula-grazer
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Silt Threadworm

πŸͺ± Worm

A segmented worm that threads through the oxygen-starved muck, eating buried detritus.

segmented10 cmdetritivore
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Drifter-Jelly

πŸͺΌ Cnidarian

Pulses gently through the warm shallows, trailing stinging tentacles to catch plankton.

radial12 cmstinging tentacles
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Tideweed

🌿 Plant

A photosynthetic mat that roots across the sunlit mudflats, binding the silt.

photosyntheticrootedmat-forming
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Muckcap

πŸ„ Fungus

A decomposer fungus that blooms on rotting detritus, casting spores on the tide.

decomposerspore-spreading6 cm
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Mat-Builder

🦠 Microbe

A colonial microbe that layers itself into living stromatolite mats on the seafloor.

colonialmat-buildingchemo-photosynthetic
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Tree of life

🐟MudfishEvo 1🦬Reed-GrazerEvo 1🦫Silt-Burrow…Evo 1🐬Dart-SwimmerEvo 1πŸ…Shoal-HunterEvo 1πŸ¦…Skip-GliderEvo 1🦎Tide-CrawlerEvo 1πŸ¦—Reed-SkaterEvo 1πŸ¦€Brine PincerEvo 1πŸ•·οΈShore Spinn…Evo 1πŸ™Lagoon Squi…Evo 1🐌Reed SnailEvo 1πŸͺ±Silt Thread…Evo 1πŸͺΌDrifter-Jel…Evo 1🌿TideweedEvo 1πŸ„MuckcapEvo 1🦠Mat-BuilderEvo 1🐟Gasping Mud…Evo 2🐟Tidewallow …Evo 2🦬Drought-Dwe…Evo 2πŸ…Mud-StalkerEvo 2🌿Spore-Tidew…Evo 2🐟Famine FinsEvo 3🐟Brackish Gl…Evo 6🧬🐟Lagoon-Boun…Evo 3🦬Tideweed Bl…Evo 3🐟GulpfinEvo 4🧬🐟Tidal Shift…Evo 7🐟Tethys Bloo…Evo 4🐟Verdant Tid…Evo 5🐟Tethys Glim…Evo 5
  • resilient
  • strained
  • fragile
  • β˜… canon
  • 🧬 hybrid
  • πŸ’€ extinct
Drag or scroll to move Β· Tab + Enter for keyboard Β· click to select, double-click to openView as list31 species

Click a species in the tree to evolve or cross-breed it here, without leaving this world. Double-click a node to open its full page.