My bad, I meant to say 18S ribosomal RNA. Indeed 16S is for bacteria.

As for my rattlesnake example:

I wanted to say that if you ASSUME humans and rattlesnakes share a CLOSE common ancestor, you can build a phylogenetic tree, based on 18S rRNA comparison, and put them on the same tree.

So again ,if you assume Death Adders are elapids, when you compare 18S rRNA, you can put them on the same tree as other elapids. What I want to see is a comparison of Death Adder 18S rRNA, an asiatic elapid 18S rRNA and an asiatic viper 18S rRNA so that we can see which is more closely related. Comparing compelete genomes and looking for homology would be much better but it is also much harder.

I am not aware of a study like this but it may be due to my ignorance.
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