Cross references:  Prokaryotes    Prokaryote Colonies    
Eukaryote Colonies     Slime Molds      Parazoa   

Neoproterozoic (Wiki) 
1 billion to 542 million years ago. 

Eukaryote (Wiki)

Eukaryota Classification 

I found the table, below, at the bottom of the article: 

Choanoflagellate (Wiki)

All of the links are active.  We humans are near the lower right-hand corner under "Metazoa>Eumetazoa".  Although links to "Archaea" and "Bacteria" are provided at the top, all the other links are to Eukaryota.   

Eukaryota classification

Domain : Archaea - Bacteria - Eukaryota



I don't know how much use I'll be making of this table, but I wanted to put it someplace where I could find it quickly if I wanted to, and this seemed like the logical place.  Although I vaguely realized that there are lots of different kinds of eukaryotes, this is more than I expected.   

Difference between Prokaryotes and Eukaryotes (Goog) 

    Cells Alive (Goog) 
    This is one of the links available from the "Difference..." link, above. 

Microbiota from Snowball Earth (Wiki) 
There is already fossil evidence for Eukaryotes 700Ma (million years ago), almost 200ma before the Cambrian Explosion. 

It is well known that several key clades of eukaryotic autotrophs (e.g., algae) and heterotrophs (e.g., testate amoebae) predate the first severe Neoproterozoic glaciation (known as the Sturtian glaciation, ≈750–700 Ma).

Historylines Eukaryote (Goog) 

Choanoflagellate (Wiki)
"The choanoflagellates are a group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of the animals."  See:  Parazoa  .  It seems to be widely agreed that the Parazoa, which are the simplest multi-cellular animals, evolved from the choanoflagellates and that the more complex animals, the Eumetazoa, then evolved from the Parazoa. 


Although PubMed identified only
160 articles when I searched for the term "prokaryotes hormone", it identified 1,039,104 articles when I searched for "eukaryote hormone".   Narrowing the search to "eukaryote hormone receptor evolution" still yielded 1,419 articles.      

Similarly, PubMed identified only 58 articles when I searched for the term "prokaryote neurotransmitter", but 914,601 when I searched for "eukaryote neurotransmitter".  Narrowing the search to "eukaryote neurotransmitter evolution" still yielded 3368.