echinus

...should have a root meaning "spiny." There is a whole phylum of lower animals called echinoderms with spiny skins, of which the starfish is the paradigm.

(From Winnie-the-Pooh:
"...And all of the things which an animal likes
Have the wrong sort of flavour or too many spikes..."
but he was talking of thistles. Tiggers don't like thistles. Which, being plants, are not echinoderms, spikes or no.)