Data Deficient

Doedicurus

Ice Age armadillo with a mace tail

Desmostylus

Pillar-toothed grazer of Miocene coasts

Archaeoindris

Madagascar's lost giant sloth lemur

Josephoartigasia monesi

Uruguay's titan rodent

Viper Boa

Looks like a viper, hugs like a boa.

Executioner Wasp

Big paper wasp, bigger attitude

Titan Beetle

Rainforest titan with iron jaws

Golden Tortoise Beetle

Real gold-made of light.

Tentacled Snake

Tentacles that trick fish

Herrerasaurus

A Triassic hunter at dinosaur dawn

Eurypterus

Paddles, claws, Paleozoic power

Phytosaurs

Croc-lookalikes of the Triassic

Barinasuchus

A land-hunting crocodile relative

Thalassomedon

Long neck, open sea, Cretaceous hunter

Barosaurus

Long-neck legend of the Morrison

Rim Rock Crowned Snake

Small snake, big appetite for bugs

Lancetfish

Sail-fin hunters of the midwater

Brazilian Treehopper

Tiny bug, wild helmet.

Xenoceratops

Alien horns from ancient Alberta

Xenacanthus

The head-spined hunters of Pangea

Cephalaspis

Head-shielded pioneer of vertebrates

Dinosaurs

One name, a million body plans

Hallucigenia

Cambrian's spiky little evolution clue

Xenoposeidon

England's one-bone sauropod mystery