The researchers used genetic material from 34 species of bedbugs, collected over 15 years, to trace back the insect’s evolutionary tree.

Initially called archaebacteria, now just archaea, these microorganisms formed a whole new, third branch of the evolutionary tree.

We do not know how to identify the various fossils with particular branches of the evolutionary tree.

Here we take a look through the microscope to see if they have progressed any further up the evolutionary tree.

Here we take a look through the microscope to see how they are progressing up the evolutionary tree.