Questions about Seals / Pinnipeds!

How much do we know about the evolution of pinnipeds? Are there any transitional forms in the fossil record?

Also, have there been any “mega-size” fossils found? Anything substantially bigger than an elephant seal?

Thanks for any information that you can provide!

Since none of the experts have chimed in, yet, here’s a free bump:

Best evidence indicates that their closest relatives are bears. The experts will hopefully give some insight on divergence from their common ancestors, and any transitional forms that might be known.

Puijila darwini is an early ancestor. I don’t believe we have a whole lot of fossils for this taxonomic group, unlike cetaceans, for which we have a rich, detailed fossil record showing many “transitional” forms. (In quotes, because these forms only look transitional in retrospect.)