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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]
Starfish, such as the ochre sea star (Pisaster ochraceus) and the reef sea star (Stichaster australis), have become widely known as examples of the keystone species concept in ecology. The tropical crown-of-thorns starfish ( Acanthaster planci ) is a voracious predator of coral throughout the Indo-Pacific region, and the Northern Pacific ...
A baby sunflower sea star at the Aquarium of the Pacific's behind-the-scenes lab. ... southern sea otters rebounded but have plateaued at about 3,000 animals in their existing range — which is ...
Sea star wasting disease or starfish wasting syndrome is a disease of starfish and several other echinoderms that appears sporadically, causing mass mortality of those affected. [1] There are approximately 40 species of sea stars that have been affected by this disease.
The sea stars are considered “functionally extinct” in California and Oregon.
The unusual animals have unique body plans arranged in five equal sections that differ greatly from the symmetric head-to-tail bodies of bilateral animals, which have left and right sides ...
A Sunflower Starfish (Pycnopodia helianthoides) undergoes regeneration after losing numerous arms. The early regenerative phase is marked by a large mobilization of various cytotypes from different locations (like the coelomic cavities) towards the edematous regenerating region. [21]
Within the urchin barrens, group of starfishes, sand dollars, and brittle stars scavenge across the barrens while facing against their fierce predator, Sunflower sea star. In Southern Africa , as chokka squid are preyed on by short-tail stingray and sand tiger shark , the Cape fur seals that share the waters are hunted by the world's largest ...