So this is sort of my longtime wishlist for like 8+ years now for a mod...
Names in Bold are things I’d say are the highest-priority, most interesting animals to add.
DICKINSONIA (Benthic) - the only Precambrian animal on this list. It’s food would probably be nothing or maybe just artificial reefs with plankton. Base could maybe be that Isotelus trilobite that came out. It would be a slow-moving bottomfeeder. Not a plant, but an animal.
KIMBERELLA (Benthic) - An early mollusk from the Ediacaran.
PEYTOIA (Reef) - An anomalocarid from the Cambrian.
HURDIA (Reef) - Another Cambrian anomalocarid.
(Optional) NEW VERSIONS OF ANOMALOCARIS, OPABINIA, AND AEGIROCASSIS
MARRELLA (Reef) - would eat plankton or shellfish maybe
TAMISCOLARIS (Pelagic) - A planktonivore
AYSHEIA (Benthic) - A onychophoran
ACADOPARIDOXIDES (Reef) - A trilobite
NECTOCARIS (Reef) - An early cephalopod
OMNIDENS (Reef) - Design could be based on Pambdelurion, but with Omnidens’ proportions (larger). Eats shellfish.
CAMBORASTER (Coastal) - An early hurdiid. Eats shellfish.
VETULICOLA (Coastal) - A small planktonivore vetulicolian.
YUYUANOZOON (Reef) - The largest known vetulicolian, a group absent from ZT2 modding currently. Would eat plankton.
TUZOIA (Benthic) - A bivalved arthopod from Stage 3 Cambrian. Isn’t a bottomfeeder.
TEGOPELTE (Benthic) - A soft-bodied bottomfeeding arthopod.
SCHINDERHANNES (Pelagic) - A small Devonian anomalocarid. Probabky would eat plankton.
HIBBERTOPTERUS (Wetlands) - An amphibious Carboniferous eurypterid. A real one this time.
Charnia (Benthic) - An Ediacaran.
Tribrachidium (Benthic) - An Ediacaran trilobozoan.
Funisia (Benthic) - A group of Ediacaran worms (possibly)
Vendoglossa (Benthic) - An Ediacaran organism.
Swartpuntia (Benthic) - An Ediacaran relative of Charnia.
Lyracystis (Reef) - a Cambrian eocrinoid.
Helicocystis (Reef) - A Cambrian cigar-shaped echinoderm.
Leptomitus (Coastal) - A Cambrian sponge.
Quadrolaminiella (Benthic) - A Cambrian sponge.
Vauxia (Reef) - A Cambrian sponge.
Chancelloria (Reef) - Another Cambrian sponge
Pirania (Coastal) - A Cambrian sponge
Yuknessia (Benthic) - A Cambrian pterobranch.
Marpolia (Coastal) - A Cambrian green algae.
Margarettia (Coastal) - A Cambrian organism, likely an algae.
Dalyia (Reef) - A pterobranch that was previously thought to be a red algae.
Saccorhytus (Benthic) - An early deuterostome. Looks like a potato with a horrifying face on it.