Science Struck
Science Struck: Decomposers in the Ocean: Role and Examples
Describes five different types of decomposers that feed on decaying organic matter in the oceans and that are at the bottom of the ocean food chain.
BiologyWise
Biology Wise: Reproduction Process of Sea Urchins
Describes the physical characteristics of sea urchins and how reproduction takes place.
Other
Hawaii Coral Reef Network: Ophiuroidea, Brittle Stars
This page simply contains a picture of a spiny brittle star. A good example of this echinoderm.