730mya Ctenophores

Ctenophores are a radially symmetrical animal phylum that is more complex than sponges and less complex than bilaterians, which include almost all other animals. Unlike sponges, both ctenophores and cnidarians have cells bound by inter-cell connections and carpet-like basement membranes, muscles, nervous systems and some have sensory organs.

Ctenophores are distinguished from all other animals by having colloblasts that capture prey by squirting glue on them, although a few ctenophore species lack them.  They are variously known as comb jellies, sea gooseberries, sea walnuts, or Venus's girdles and are voracious predators although they lack stinging cells.

They are not currently under any threat but are a major threat to fish stocks where they feed on fish eggs and larvae.

For more information see:

https://animaldiversity.org/accounts/Ctenophora/