Global Ocean

Location:

Worldwide

(pretty much the largest ecosystem in this series spanning half the globe)

Biome:

Ocean

(Which is technically multiple biomes in one, but here we focus on the rocky coasts, the open ocean, and the deep sea)

Climate:

Warm and stable due to the greenhouse effect.

Hazards:

Predatory sharks, venomous silverswimmers, massive filter feeders, and stinging jellyfish descendants.

Bestiary:

Silverswimmers

(Larval Crustacean Descendants that practiced neoteny, Taking up the majority of niches once occupied by fish. Although fish are still present in the seas of 200 million AD, they are no longer the dominant marine organism. most of the remaining fishes of the Global Ocean are descendants of deep sea species which were spared from the gamma ray burst mass extinction, however by the time the fish returned to the surface waters Silverswimmers had already supplanted a lot of their original niches)

Common Silverswimmer (Crustalaria minima)

Size: 10 cm (4 in).

Appearance: Metallic body with krill-like mouthparts for filtering plankton.

Niche: Shoaling filter-feeder forming the base of the food chain.

Open Ocean Silverswimmer (Pelagocrusta rapida)

Size: 40 cm (16 in).

Appearance: Slender body with fin-like appendages and a streamlined head.

Niche: Predatory free-swimmer feeding on plankton and small fish.

Predatory Silverswimmer (Carnivopoda serpentina)

Size: 1.5 m (5 ft).

Appearance: Long, eel-like body with sharp mandibles.

Niche: Fast predator targeting smaller silverswimmers and fish.

Swordfish Silverswimmer (Gladiocrustacea pisciformis)

Size: 3 m (10 ft).

Appearance: Streamlined body with a long, spear-like rostrum.

Niche: Apex predator competing with Sharkopaths.

Scavenger Silverswimmer (Detritophaga lamproides)

Size: 1 m (3.3 ft).

Appearance: Hagfish-like body adapted for scavenging carcasses.

Niche: Feeds on dead animals and parasites on larger silverswimmers.

Seabed Silverswimmer (Rayomorpha limosa)

Size: 2 m (6.6 ft).

Appearance: Flattened, ray-like body camouflaged in sand.

Niche: Benthic predator buried in sediment.

Spike-backed Silverswimmer (Aculeata gregaria)

Size: 80 cm (31 in).

Appearance: Armored body with dorsal spines.

Niche: Shoaling predator with defensive spines.

Spiny Silverswimmer (Spinochelia solitaria)

Size: 1.5 m (5 ft).

Appearance: Solitary with spines on head and tail.

Niche: Ambush predator lurking near reefs.

Wide-headed Silverswimmer (Planocrustacea expansis)

Size: 60 cm (24 in).

Appearance: Broad head with enlarged feeding appendages.

Niche: Slow-moving filter-feeder near reefs and Driftshroud beds.

Other Invertebrates

Rainbow Squid (Chromocephalus leviathan)

Ancestor: Squid.

Size: 25 m (82 ft).

Appearance: Gigantic squid with color-changing skin and bioluminescent patterns.

Niche: Apex filter-feeder rivaling Bladewhales for plankton and shoaling prey.

Titanautilus (Titanocirrus spiralis)

Ancestor: Nautilus.

Size: 1 m (3.3 ft) shell diameter.

Appearance: Massive, coiled shell with tentacles extending outward.

Niche: Deep-sea scavenger, providing shelter for smaller creatures.

Glowmantis (Lucimantis aquatica)

Ancestor: Mantis Shrimp.

Size: 50 cm (20 in).

Appearance: Bioluminescent hunter with spiked raptorial claws.

Niche: Ambush predator feeding on Driftftclaws and small Silverswimmers in the shallows.

Driftclaw (Limulus abyssalis)

Ancestor: Horseshoe Crab.

Size: 40 cm (16 in).

Appearance: Hard-shelled, bottom-dwelling scavenger.

Niche: Feeds on decaying matter in the shallows, preyed upon by Glowmantises and Silverswimmers. they come ashore to mate and lay their eggs in the surf where they are easy prey for Ocean Flish.

Tendrilfin (Medusoformis serpentina)

Ancestor: Jellyfish.

Size: 1.5 m (5 ft) bell diameter, tendrils up to 10 m (33 ft).

Appearance: Pulsating bell with long stinging tentacles.

Niche: Free-floating predator targeting shoaling silverswimmers.

Driftstalker Octopus (Ambustopus camouflagia)

Ancestor: Octopus.

Size: 70 cm (28 in).

Appearance: Camouflaged body with grasping tentacles for ambushing prey.

Niche: Ambush predator hiding in Driftshroud mats.

Dartspear Squid (Pelagoteuthis hastile)

Size: 3 meters

Ancestor: Squid

Appearance: Sleek, torpedo-shaped body with iridescent skin; long, streamlined fins for speed; tentacles with sharp, retractable barbs.

Niche: Agile mid-level predator of silverswimmers and small fish.

Weedscuttler (Laminisopoda marina)

Ancestor: Marine isopod

Size: Up to 30 cm (12 inches) long.

Appearance: Flattened, oval body with a carapace-like exoskeleton camouflaged in shades of green and brown to blend with the seaweed.

Niche: Herbivore; it grazes on seaweed in the shallows of the Global Ocean.

Beachcrawler (Holothurios locomotus)

Ancestor: Sea Cucumber.

Size: 80 cm (31 in).

Appearance: Leathery, segmented body with muscular legs for crawling.

Niche: Scavenger and decomposer on beaches and reefs.

Fish

Ocean Flish (Volapiscis alata)

Ancestor: Flying Fish.

Size: 40 cm (16 in).

Appearance: Streamlined body with wing-like pectoral fins for gliding.

Niche: Aerial predator filling the niche of seagulls, snatching prey near the surface.

Duck Flish (Anatidocodamus natator)

Ancestor: Flying Fish.

Size: 60 cm (24 in).

Appearance: Paddle-like pectoral fins for gliding and sturdy pelvic fin-derived "legs" for waddling along shores and shallow waters.

Niche: Surface-skimmer and bottom-feeder, scooping up plankton and silverswimmers near the water's edge with its duck-like bill.

Grebe Flish (Podicipiscis dives)

Ancestor: Flying Fish.

Size: 50 cm (20 in).

Appearance: Compact body with webbed pelvic fins adapted for walking and diving.

Niche: Semi-aquatic predator, stalking crustaceans and small fish both underwater and along muddy shorelines

Albatross Flish (Diomedeocodamus volans)

Ancestor: Flying Fish.

Size: 2 m (6.5 ft).

Appearance: Long, slender wings adapted for gliding long distances.

Niche: Open-water scavenger and predator, soaring above the sea.

Skua Flish (Stercoraripiscis rapax)

Ancestor: Flying Fish.

Size: 1 m (3.3 ft).

Appearance: Aggressive build with hooked jaws for tearing flesh.

Niche: Kleptoparasite, stealing food from other Flish and scavenging carcasses.

Tern Flish (Sternocodamus acutus)

Ancestor: Flying Fish.

Size: 70 cm (28 in).

Appearance: Slim and agile with pointed wings for quick dives.

Niche: Surface hunter preying on small fish and crustaceans.

Avocet Flish (Recurvirocodamus benthos)

Ancestor: Flying Fish.

Size: 50 cm (20 in).

Appearance: Slender build with long, curved pectoral fins for gliding and thin, leg-like pelvic fins for wading.

Niche: Shallow-water sifter, using its curved, elongated mouthparts to probe sediment for invertebrates.

Cormorant Flish (Phalacrocorapiscis profunda)

Ancestor: Flying Fish.

Size: 80 cm (31 in).

Appearance: Streamlined body with sharp jaws, webbed pelvic fins for underwater propulsion, and hooked claws for perching.

Niche: Diving predator, chasing fish and silverswimmers beneath the surface and resting on rocky outcrops.

Spikeflier (Aeropiscis rapax)

Ancestor: Flying Fish.

Size: 50 cm (20 in).

Appearance: Slender, winged body adapted for aerial pursuit. more closely resembles its ancestor than its relatives, a basal offshoot of the Flish family.

Niche: Predatory flyer preying on smaller flish species.

Sharkopath (Luminoselachus ferox)

Ancestor: Kitefin Shark.

Size: 5 m (16 ft).

Appearance: Sleek body with glowing bioluminescent patches for communication.

Niche: Pack-hunting predator targeting silverswimmers and fish.

Riptide Shark (Thalassorhynchus velocis)

Ancestor: Thresher Shark.

Size: 4 m (13 ft).

Appearance: Long tail fin used to stun schools of prey.

Niche: Migratory predator targeting silverswimmer shoals.

Bonejaw Shark (Lamnipiscis serratus)

Ancestor: Cookiecutter Shark.

Size: 1 m (3 ft).

Appearance: Small, stocky body with circular, serrated jaws.

Niche: Parasite and scavenger feeding on wounds of larger animals.

Bladewhale (Gigantopiscis filterus)

Ancestor: Ribbonfish (Largehead Hairtail).

Size: 15 m (49 ft).

Appearance: Massive eel-like body with a tall, undulating dorsal fin extending to the length of its back for slow swimming.

Niche: Filter-feeder competing with Rainbow Squids for plankton and silverswimmers.

Ribbonfin (Thalassopiscis elegantis)

Ancestor: Oarfish.

Size: 12 m (39 ft).

Appearance: Neotenic fish with long, trailing ribbon-like fins.

Niche: Migratory filter-feeder competing with Bladewhales.

Needleflesh (Sagittapiscis tenuis)

Ancestor: Hatchetfish.

Size: 60 cm (24 in).

Appearance: Thin, knife-like body adapted for slicing through water. capable of turning invisible using photophores far more advanced than those of its ancestors.

Niche: Midwater predator targeting Silverswimmers while avoiding larger predators.

Spikefin (Venomipiscis armatus)

Ancestor: Scorpionfish.

Size: 70 cm (28 in).

Appearance: Camouflaged body with venomous spines for defense.

Niche: Ambush predator nestled among driftshroud mats targeting small fish and juvenile Silverswimmers.

Lashfang (Anguillimonstrum lumina)

Ancestor: Anglerfish.

Size: 1.5 m (5 ft).

Appearance: Bioluminescent predator with whip-like tendrils for luring prey.

Niche: Deep-sea predator feeding on Silverswimmers, hunted by Sharkopaths.

Chasmfang (Abyssorictus vorax)

Ancestor: Gulper Eel.

Size: 3 m (10 ft).

Appearance: Large, expandable mouth for swallowing prey whole.

Niche: Deep-sea ambush predator competing with Shadowfins.

Shadowfin (Cryptelachus obscura)

Ancestor: Goblin Shark.

Size: 4 m (13 ft).

Appearance: Pale, elongated body with long, sensitive snouts for detecting electrical signals.

Niche: Deep-sea hunter stalking Silverswimmers and Chasmfangs.

Bristlejaw (Dentilumbricus ferox)

Ancestor: Dragonfish.

Size: 90 cm (35 in).

Appearance: Thin body with glowing patches and needle-like teeth.

Niche: Midwater predator using bioluminescence to attract prey.

Plants

Driftshroud (Sargassodriftus fluitans)

Ancestor: Sargassum Seaweed.

Size: Floating mats spanning kilometers.

Appearance: Dense, tangled fronds forming floating islands.

Niche: Shelter for juvenile Silverswimmers and predators like Spikefins and Driftstalker Octopuses.