They don’t seem to have spines, though. OTOH, neither does Michelinoceras.
Did he specifically say it was something ancient/extinct? Maybe it was some kind of sea anemone or something.
Could you also clarify how he pronounced the “mesisah” / “mezzizah” part – which syllables were accented and how the vowels were pronounced, I mean?
That is, if you haven’t already found out, of course.
No, but on The Dinosaur Train show, which (if the littlest Magills are any indication) is a pretty popular show among the three to five year old set, michelinoceras do a sort-of water dance number for the Pteranodon family which may look like they have spines. If I remember tomorrow morning, I’ll ask Spike if he remembers whether michelinoceras has spikes.