An Invertebrate is an animal without a backbone. The group includes 95% of all animal species; all animals except those in the chordate subphylum Vertebrata (fish, amphibians, reptiles, birds, and mammals).


Precambrian supereon

In what is most likely the Proterozoic eon, the third and last part of the Precambrian, worms thrive and grow to large sizes. (Episode 2.2)

Silurian period

Giant Scorpions and Giant Millipedes live in deserts. (Episode 2.5)

Devonian period

Ammonites first emerge.

Carboniferous period

Arthropleura and Protosolpugidae, reminiscent of giant centipedes and spiders respectively, live in this period. (Episode 1.2) Insects such as the Meganeura also dwell in this period. (Episode 1.1)

Cretaceous period

Ammonites die out.

Holocene epoch

Cestoid parasites coexist with Dodos around the same time Dodos are found by Humans. (Episode 1.4)


Megopteran thrive in the ruins of human civilisation, locked in conflict with their vertebrate enemies the Future Predators. A type of Future Worm that could possibly be larvae of the Megopteran exists in this time as well. (Episode 3.8, Episode 3.10) In another Future, the descendants of Beetles became swarms of ravaging killers and fight for live underground with larger carnivorous arthropods. (Episode 5.1, Episode 5.4)



Wikipedia has a more detailed and comprehensive article on Invertebrate!

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