Tethys Shallows
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
Starting species(17)
Mudfish
π Fish
A small, hardy fish of the tidal shallows that grubs through silt for plankton and detritus.
Reed-Grazer
𦬠Grazer
A placid, broad-jawed creature that mows the algal mats coating the lagoon reeds.
Silt-Burrower
𦫠Burrower
A worm-like dweller of the oxygen-poor muck, sifting buried detritus from the silt.
Dart-Swimmer
π¬ Swimmer
A streamlined, restless swimmer that chases plankton clouds through open water.
Shoal-Hunter
π Predator
A patient ambush predator that lurks at channel edges and lunges at passing shoals.
Skip-Glider
π¦ Flyer
Leaps from the water on stiffened fins, gliding over the surface to snatch drifting insects.
Tide-Crawler
π¦ Tetrapod
Hauls itself across exposed mudflats at low tide on four stubby limbs, gulping air.
Reed-Skater
π¦ Arthropod
Skims across the lagoon's surface film on six slender legs, snatching tiny prey.
Brine Pincer
π¦ Crustacean
A small armored scavenger that sidles through tidepools cleaning up the dead.
Shore Spinner
π·οΈ Arachnid
Strings silk between reed stalks to snare drifting insects above the water.
Lagoon Squidling
π Cephalopod
A tiny, quick-witted hunter that jets through the shallows, flushing its skin with color.
Reed Snail
π Gastropod
Rasps algal films from reed stalks with a toothed radula, sheltering in a coiled shell.
Silt Threadworm
πͺ± Worm
A segmented worm that threads through the oxygen-starved muck, eating buried detritus.
Drifter-Jelly
πͺΌ Cnidarian
Pulses gently through the warm shallows, trailing stinging tentacles to catch plankton.
Tideweed
πΏ Plant
A photosynthetic mat that roots across the sunlit mudflats, binding the silt.
Muckcap
π Fungus
A decomposer fungus that blooms on rotting detritus, casting spores on the tide.
Mat-Builder
π¦ Microbe
A colonial microbe that layers itself into living stromatolite mats on the seafloor.
All species (31)
- MudfishEvo 1A small, hardy fish of the tidal shallows that grubs through silt for plankton and detritus.
- Reed-GrazerEvo 1A placid, broad-jawed creature that mows the algal mats coating the lagoon reeds.
- Silt-BurrowerEvo 1A worm-like dweller of the oxygen-poor muck, sifting buried detritus from the silt.
- Dart-SwimmerEvo 1A streamlined, restless swimmer that chases plankton clouds through open water.
- Shoal-HunterEvo 1A patient ambush predator that lurks at channel edges and lunges at passing shoals.
- Skip-GliderEvo 1Leaps from the water on stiffened fins, gliding over the surface to snatch drifting insects.
- Tide-CrawlerEvo 1Hauls itself across exposed mudflats at low tide on four stubby limbs, gulping air.
- Reed-SkaterEvo 1Skims across the lagoon's surface film on six slender legs, snatching tiny prey.
- Brine PincerEvo 1A small armored scavenger that sidles through tidepools cleaning up the dead.
- Shore SpinnerEvo 1Strings silk between reed stalks to snare drifting insects above the water.
- Lagoon SquidlingEvo 1A tiny, quick-witted hunter that jets through the shallows, flushing its skin with color.
- Reed SnailEvo 1Rasps algal films from reed stalks with a toothed radula, sheltering in a coiled shell.
- Silt ThreadwormEvo 1A segmented worm that threads through the oxygen-starved muck, eating buried detritus.
- Drifter-JellyEvo 1Pulses gently through the warm shallows, trailing stinging tentacles to catch plankton.
- TideweedEvo 1A photosynthetic mat that roots across the sunlit mudflats, binding the silt.
- MuckcapEvo 1A decomposer fungus that blooms on rotting detritus, casting spores on the tide.
- Mat-BuilderEvo 1A colonial microbe that layers itself into living stromatolite mats on the seafloor.
- Mud-StalkerEvo 2A patient predator that burrows into the warm mudflats, ambushing prey that ventures too close.
- Drought-DwellerEvo 2A smaller, more resilient grazer that can survive brief periods out of water by burrowing into damp mud.
- Gasping MudfishEvo 2A slightly larger variant of the Mudfish, this descendant has evolved to cope with fluctuating oxygen levels by supplementing its gill respiration.
- Tidewallow GulpfishEvo 2A larger, more robust version of the Mudfish, this species has adapted to capitalize on the abundant food sources of the Tethys Shallows.
- Spore-TideweedEvo 2This Tideweed has evolved to release buoyant, spore-like structures that drift on the currents, seeking new patches of mudflat to colonize. Its mat-forming tendency is reduced, prioritizing dispersal over dense anchoring.
- Tideweed BloaterEvo 3A larger, faster-reproducing grazer that exploits the abundant Tideweed, laying large clutches of eggs to ensure offspring survival.
- Famine FinsEvo 3This descendant has a leaner build and a more aggressive foraging strategy to maximize calorie intake in lean times.
- Lagoon-Bound GulpfishEvo 3This isolated Gulpfish has adapted to a more sedentary life, relying on its enlarged mouth to exploit any available food source in its shrinking territory.
- GulpfinEvo 4A generalist fish blending opportunistic feeding with a larger mouth for gulping prey, suited for the fluctuating conditions of Tethys Shallows.
- Tethys Bloom-EaterEvo 4This Gulpfish has shifted its focus to the abundant algae and detritus of the shallows, developing a more efficient feeding apparatus.
- Verdant Tidewallow GulpfishEvo 5A larger, faster-reproducing generalist fish that exploits abundant food sources, investing in rapid growth and more offspring.
- Tethys GlimmerfinEvo 5This fish has developed vibrant, iridescent scales and enlarged dorsal fins, used in dazzling courtship displays to attract mates.
- Brackish Glimmer-GhastEvo 6A sluggish, iridescent fish adapted to low-oxygen mudflats, with a mouth capable of both filter-feeding and grasping small prey.
- Tidal ShifterEvo 7A more active, elongated fish with robust gills and streamlined fins, adapted for a life increasingly spent in fluctuating water levels.
Tree of life
- resilient
- strained
- fragile
- β canon
- 𧬠hybrid
- π extinct
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.

