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Can you edit the details for this observation so that it shows in the invertebrate group. I think that it is an Ascidian and that it could be Botryllus schlosseri.
Assidians are in the Phylem Chordata = Subphylem Urochordata so should they be invertebrates?
Yes they are still invertebrates but I appreciate why you are asking. The Phylum Chordata is structured as follows:
Subphylum Urochordata (Tunicates)
Subphylum Cephalochordata (Lancets)
Subphylum Vertebrata (the vertebrates)
All of the chordates share certain characteristics but only the vertebrata have a backbone.
Lat/Lng: 50.34074, -4.7045
OS grid ref: SX076524