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Re: Favorite Paleotrivia?
At least one species of the Recent plate-shaped xenophyophore _Stannophyllum_
gets even larger - nearly a foot across (but only a few millimetres deep).
Again, like _Nummulites_ (and most forams, for that matter) it's coenocytic
rather than mononucleate (unicellular vs. multicellular can be a surprisingly
difficult thing to define for coenocytic organisms).
Now I think of it, hexactinellid sponges are also coenocytic, which would make
them arguably unicellular. The central spicule of _Monorhaphis chuni_ gets up
to three metres in length.
----- Original Message -----
From: "David Marjanovic" <firstname.lastname@example.org>
To: "DML" <email@example.com>
Sent: Friday, 13 March, 2009 7:39:44 AM GMT +08:00 Perth
Subject: Re: Favorite Paleotrivia?
> Fossils of the marine protozoan genus Nummulites (a single-celled
> organism) are up to 15 cm across, making them larger than many fossil
> birds and mammals
Well, "single-celled"... it cheats. Each of the tiny chambers has a nucleus
of its own.