Prehistoric seacreatures
by vidartuff
Prehistoric seacreatures puts ancient marine animals into the ocean and river biomes of 1.20.1, each with its own drops, fights and crafted gear.
What it does
Liopleurodon, a large marine reptile, is the strongest of the new sea creatures. Its serrated teeth deal heavy impact damage, and a defeated liopleurodon drops teeth that craft into a serrated blade, which adds bleeding on hit. A sword can be repaired by combining it with serrated teeth, and a serrated bow fires an Orthoceras arrow.
Dunkleosteus is an aggressive armoured fish that hunts players and smaller prey such as salmon, cod and tropical fish. Its dermal plates form a new armour set that increases survivability while exploring the seas, grants faster movement underwater and the ability to breathe underwater, and can repair armour at an anvil. Trilobite, Jaekelopterus, Sacabambaspis, Ichthyosaurus and Brygmophyseter fill out the water biomes, including a rideable whale and a tameable pack hunter that needs saddles.
Installation needs Forge for 1.20.1 only. Both the server and every player must run the mod, since the environment is client and server. The mod is published under All rights reserved and is not open source.
Key features
Liopleurodon weapons
Serrated teeth from a defeated liopleurodon craft into a blade that causes bleeding.
Dunkleosteus armour
Dermal plates from a dunkleosteus craft a new armour set and can be combined with a crafting shield.
Jaekelopterus claw
A freshwater creature whose fragments combine into a claw that makes opponents hard to escape from.
Rideable marine life
An Ichthyosaurus can be tamed with Sacabambaspis meat and a saddle, and a Brygmophyseter whale can be saddled for riding.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Ocean exploration
Players who explore deep water can gather armour, food and tamed mounts from the new marine animals.
Survival food
Sacabambaspis meat cooks into a meal, giving survival players another source of food.
Who it’s for: Players who want ancient marine animals in their Forge worlds, and server owners who run the mod for both sides.
How it compares
Prehistoric Universe is server-side only and is published under All rights reserved for 1.20.1, so players join without installing it. Prehistoric Adventures is client and server, licensed under the Apache License 2.0 and also built for 1.20.1, so it is open source where this mod is not. The Past Ages (REWORK) is a client and server mod for 1.20.1 under All rights reserved, sharing this mod's environment and license.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Prehistoric seacreatures | Forge | 1.20.1 | Client and server | 2026-03-06 |
| Prehistoric Universe | Forge | 1.20.1 | Server-side only | 2025-08-13 |
| Prehistoric Adventures | Forge | 1.20.1 | Client and server | 2025-12-06 |
| the past ages (REWORK) | Forge | 1.20.1 | Client and server | 2026-03-06 |
Questions
Does Prehistoric seacreatures need to be installed on the server?
Which Minecraft version does Prehistoric seacreatures support?
How is the Ichthyosaurus tamed for riding?
In the catalog
Prehistoric seacreatures is one of 11,058 Mobs mods on ModsFinder, and one of 6,527 Mobs mods for Forge. 34,764 mods support Minecraft 1.20.1.
Similar mods
What the author says
The liopleurodon has serrated teeth that deals massive damage on impact. If defeated, the liopleurodon will award you with their teeth that can be used to craft the serrated blade.
Official listing
- Modrinth page
- modrinth.com/mod/prehistoric-seacreatures
- Owner
- vidartuff
- Published
- 2026-02-15
- Updated on Modrinth
- 2026-03-06
- Facts verified
- 2026-10-15