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Starfish do not appear to have any mechanisms for osmoregulation, and keep their body fluids at the same salt concentration as the surrounding water. Although some species can tolerate relatively low salinity , the lack of an osmoregulation system probably explains why starfish are not found in fresh water or even in many estuarine environments.
The common sunstar (Crossaster papposus) is a species of sea star (aka starfish) ... It will eat almost anything including smaller starfish and sunstars, swallowing ...
Patiria miniata, the bat star, sea bat, webbed star, or broad-disk star, is a species of sea star (also called a starfish) in the family Asterinidae. It typically has five arms, with the center disk of the animal being much wider than the stubby arms are in length. [2] Although the bat star usually has five arms, it sometimes has as many as ...
The common starfish, common sea star or sugar starfish (Asterias rubens) is the most common and familiar starfish in the north-east Atlantic. Belonging to the family Asteriidae, it has five arms and usually grows to between 10–30 cm across, although larger specimens (up to 52 cm across) are known. The common starfish is usually orange or ...
Tube feet (technically podia) are small active tubular projections on the oral face of an echinoderm, such as the arms of a starfish, or the undersides of sea urchins, sand dollars and sea cucumbers; they are more discreet though present on brittle stars, and have only a feeding function in feather stars. They are part of the water vascular system.
In the Indo-Pacific waters, white-spotted puffers, and Titan triggerfish have also been found to eat this starfish. [38] Triton's trumpet, a very large gastropod mollusk, is a known predator of Acanthaster in some parts of the starfish's range. The Triton has been described as tearing the starfish to pieces with its file-like radula. [39]
Experts say the discovery will help them understand what animals were eating during the Cretaceous period. ... an underwater species related to starfish and sea urchins - in a piece of chalk ...
Underside of a sunflower sea star. Sunflower sea stars can reach an arm span of 1 m (3.3 ft). They are the heaviest known sea star, weighing about 5 kg. [4] They are the second-biggest sea star in the world, second only to the little known deep water Midgardia xandaros, whose arm span is 134 cm (53 in) and whose body is 2.6 cm (roughly 1 inch) wide. [7]