Nervous System Of Asterias. Starfish Are Marine Invertebrates. They Typically Have A Central Disc And Five Arms, Though Some Species Have A Larger Number Of Arms. The Aboral Or Upper Surface May Be Smooth, Granular Or Spiny, And Is Covered With Overlapping Plates. Many Species Are Brightly Coloured In Various Shades Of Red Or Orange, While Others Are Blue, Grey Or Brown. Starfish Have Tube Feet Operated By A Hydraulic System And A Mouth At The Centre Of The Oral Or Lower Surface. They Are Opportunistic Feeders And Are Mostly Predators On Benthic Invertebrates. Several Species Have Specialized Feeding Behaviours Including Eversion Of Their Stomachs And Suspension Feeding.

KEYWORDS

anatomy animal arm asterias beach brown closeup common copy cut decoration decorative detail dry echinodermata fish five france isolated live marine nature negative nervous north ocean one orange rubens sand sea souvenir space star starfish system tide top white