To me, THAT is a huge message. There's folks in Japan who buy these because they think these creatures are interesting! You can even buy deep-sea biology books at 7-11 in Japan!
Plush toys are gaining momentum, there's even a set of Paleozoic invertebrate plushies!!
The National Museum of Nature and Science of Tokyo had a fun set of Paleozoic invertebrates made into plushies! Here's a carpoid! (Paleozoic echinoderm) But there was a whole Cambrian set which I'm not showing here...
4. But the BIGGEST THING? small toys. Also known as gashapon! As mentioned earlier, tiny little 2-6 cm replicas of the real thing. Part of different sets following various themes for collectors..
For example, highly detailed Paleozoic invertebrates! Eurypterids and trilobites! (carpoids & others are also available).