Australian Institute of Marine Science - Coral Fact Sheets and ID Friday, 18 September 2015 21:26 Guest Coral Identification / Keeping
The Meat of the Matter - " If anything, these animals are weirder on the inside than they are on the outside (Hyman, 1955; Kozloff, 1990, Ruppert et al., 2003). "
Echinoderm Biology - A very good overall site covering this group of animals.
Protoreastor nodosus - Commonly called the chocolate chip starfish. As with the majority of starfish, this family group is predatory and is not to be considered reef safe, consuming a wide variety of prey including corals and inverts. I would only keep this species as part of a fish only aquarium. They also come in a wide variety of colorations.
Archaster typicus ( Sand Sifting Starfish ) - Usualy purchased to help with keeping the top of the sandbed cleaned, which is a very bad reason to purchase them since they do not eat surface algae and are predators of the life found within a live sandbed. Not a good thing to have happen to the sandbed.
Echinaster luzonicus ( predator )
Acanthaster planci (crown of thorns starfish) Shown below is a 1cm juvenile - As juveniles, they will eat surface algae, but as they grow, they become very efficient predators of corals.
Crinoids ( feather stars ) and please, do not buy one, our enclosed and filtered systems do not provide them with the constant planktonic food supply that they need and will slowly starve to death in a typical reef aquarium.
Yet to be identified A Juvenile Ophiomastix variabilis Ophiomastix variabilis
Ophiarthrum elegans Ophiomastix annulosa Ophiolepis superba
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