Golden Crinoid, Davidaster rubiginosa

by | Feb 25, 2016 | Reef, Science | 0 comments

Hello friends, I have a fun Caribbean reef scene for you all today with a Golden Crinoid being the main subject. I rarely see these prehistoric looking creatures any more and if I do they are usually the all black ones, these orange ones are super hard to find.

Crinoids are marine animals that make up the class Crinoidea of the echinoderms (phylum Echinodermata). Crinoidea comes from the Greek word krinon, “a lily”, and eidos, “form”. They live both in shallow water and in depths as great as 6,000 metres (20,000 ft). Sea lilies refer to the crinoids which, in their adult form, are attached to the sea bottom by a stalk. Feather stars or comatulids refer to the un-stalked forms.

Crinoids are characterized by a mouth on the top surface that is surrounded by feeding arms. They have a U-shaped gut, and their anus is located next to the mouth. Although the basic echinoderm pattern of fivefold symmetry can be recognised, most crinoids have many more than five arms. Crinoids usually have a stem used to attach themselves to a substrate, but many live attached only as juveniles and become free-swimming as adults.

There are only about 600 extant crinoid species, but they were much more abundant and diverse in the past.


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