David Attenborough continues exploring the aquatic invertebrates. He sometimes does not identify an animal while describing it.
For example, he neglects to identify the shrimp-like Morocco fossil as a Trilobite, but later refers back to the Trilobite.
And what is the "round worm" burrowing in the sand? Looks like an Annelid (segmented worm) rather than a Nematode, but we are not told.
He also makes some questionable assertions such as implying that molluscs developed shells from flatworm ancestors.
There are other annoying omissions. For example, he does not tell us that the British Columbia Rocky Mountain site is the famed
Burgess Shale; this is like a Louvre tour guide failing to mention that the painting everyone is looking at is called Mona Lisa.
Then, the only fossil specimen he identifies at Burgess Shale is an obscure creature called Peripatus (he should have told us it is really
Aysheaia), omitting to identify the Hallucigenia and Opabinia.
Overall, he makes strong arguments for the relationships among the invertebrates, especially the crustaceans, especially emphasizing
the adaptability of a segmented body.
The highlight of this episode is the electron microscope view of a fossil Trilobite eye.
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