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Are they any reconstructions of these sauropterygians that were sister groups of the plesiosaurs. Are there any known fossils that lie outside the plesiosaur-nothosaur containing clade but within the clade formed by placodonts with the former two, that is:

|----?  _ Plesio

I looked into Sander et al describing Augustasaurus where they mention a primitive plesiosaur Thalasiodracon but given not in formation. How much of this beast is known? Does it exclude all other plesiosaurs standing in clade by itself.
Thanks in advance for any one who can provide information and to all those have on former occasions.
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