Title says all. Yes yes, they're not the most popular animals, but I feel considering they're in at least quite a few images, having a tag for this phylum could have a use. Echinoderms include:

• sea stars/starfish (also since it's related: sea star should be aliased to starfish)
• sea urchins
• sand dollars
• sea cucumbers
• crinoid/sea lilies

The tag would be implicated to marine, and the above tags could be implicated to echinoderm.

Thoughts?

I agree with having that tag.
We have posts featuring individuals of all non-extinct classes of this phylum (except ophiuroids, also know as ophiurus, serpent stars or brittle stars), what justify having it, at minimum, as an umbrella tag.

We should alias 'crinoid' to 'sea_lily' as well, sice we usually prefer using common names when they exist.

Perhaps we also should alias 'sand_coin', 'sea_cookie' and 'sand_biscuit' to 'sand_dollar' to facilitate searching and tagging, because those animals are known as 'sand dollars' only in USA and Australia.

O16 said:
I agree with having that tag.
We have posts featuring individuals of all non-extinct classes of this phylum (except ophiuroids, also know as ophiurus, serpent stars or brittle stars), what justify having it, at minimum, as an umbrella tag.

We should alias 'crinoid' to 'sea_lily' as well, sice we usually prefer using common names when they exist.

Perhaps we also should alias 'sand_coin', 'sea_cookie' and 'sand_biscuit' to 'sand_dollar' to facilitate searching and tagging, because those animals are known as 'sand dollars' only in USA and Australia.

Ah! I never even knew sand dollar wasn't their universal name, the more you know I suppose.

Anyways I agree with your reply; aliasing to the most common names for them would be for the best and helpful for taggers.