As interesting as seashrogs are, the emphasis on seashrogs and things that interact with seashrogs in the Bonegrove's description makes Seashrogs seem to be the human-equivalent protagonists of Sagan 4 Alpha.
I like how it differentiates Fermi Temperate Beach's coast and beach environments, and how it may make a new sub-environment itself.
I was a little disappointed it has no relation to the boneflora (Bonephyta primus descendants), though.