Rosette-Scaled Brittle Star

The Rosette-Scaled Brittle Star (Ophiolepis elegans) is a marine (saltwater) invertebrate in the Ophiuridae family of brittle sea stars (starfish). 

The Rosette-Scaled Brittle Star has a round disc with five narrow arms radiating from the disc. Its arms are brownish with dark bands. The upperside of the disc has scales in a rosette pattern. There are two large scales on each side of its arms and a column of scales between each pair of arms. It has spines on its arms. The underside disc is where the mouth is located. It is light-beige in colour. Its mouth has jaws. 

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Mediterranean Feather Star

The Mediterranean Feather Star (Antedon mediterranea) is a marine (saltwater) crinoid in the Antedonidae family of unstalked feather starfish. 

The Mediterranean Feather Star can be a range of colours, such as white, yellow, orange, red, deep purple, and brown. It has a calyx – a small cup-shaped structure that is surrounded by five pairs of feathery arms. These 10 arms have 40 grasping cirri which are curl-like tufts, feathers, or fringes. The arms are like tentacles. The arms are prehensile, which means that they can grasp objects, food, and hard surfaces. In danger, the arms can roll up. The arms are fragile, but they can regenerate (re-grow) if they break off. 

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Chocolate Chip Sea Star

The Chocolate Chip Sea Star (Protoreaster nodosus) is a marine (saltwater) starfish in the Oreasteridae family. It is also known as the Horned Sea Star. It is an invertebrate, because it does not have a backbone.It is not a fish, so scientists prefer to say that it is a sea star.

The Chocolate Chip Sea Star has five elongated tube limbs, called arms or feet. It has several black or dark-brown tubercles on its arms. It has a greyish body with dark stripes that connect the tubercles. 

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Red Knob Sea Star

The Red Knob Sea Star (Protoreaster linckii) is a starfish. It is a marine (saltwater) invertebrate, because it does not have a backbone. It is also known as the Red Knob Starfish, the Red Spine Star, or the African Red Knob Sea Star. It is not a fish, so scientists prefer to say that it is a sea star.

The Red Knob Sea Star has five elongated tube limbs, called arms or feet. It has several bright red tubercles on its arms. It has a grey body with red stripes that connect the tubercles. 

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Spineless Sea Urchin

The Spineless Sea Urchin (Abatus cordatus) is a marine (saltwater) invertebrate echinoderm. It is also known as the Kangaroo Sea Urchin because the female keeps her eggs in a pocket or pouch. It is related to starfish (sea stars). 

The Spineless Sea Urchin has a hard, spherical (ball-shaped) shell, called a test, with no backbone and no spines sticking out of its body (like the Spiny Sea Urchin). Its mouth, with a small jaw, is in the centre of the urchin on its underside. It does not have eyes. It is sensitive to touch, light, and chemicals, due to the numerous sense cells around its mouth.

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Starlet Cushion Starfish

The Starlet Cushion Starfish (Asterina gibbosa) is a small marine (saltwater) invertebrate (without an inner skeleton) echinoderm. It is not a fish.  Zoologists prefer to call it the Starlet Cushion Sea Star.

The Starlet Cushion Starfish has five short blunt arms and a puffy appearance that looks like a cushion. Its upper surface has short, sharp spines. It can be blue, brown, green, or orange. Its mouth is on its underside in the centre.

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The Starfish (Pentaceraster mammillatus) is a five-limbed marine animal. It is also called the Sea Star, because it is not a fish. It is an invertebrate animal, because it has no backbone.

The Starfish can be various colours, such as green, yellow, purple, pink and grey. It has a thick body with rounded tubercles (lumps) on its surface – often of a different colour to its body. It has five limbs radiating from a central point (its mouth) in a star-shape. Its mouth is on the underside of its body.

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