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Red-knobbed starfish: Indian Ocean Protoreaster nodosus (Linnaeus, 1758) Chocolate chip sea star: Indian Ocean and western Pacific ocean Protoreaster nodulosus (Perrier, 1875) Knobbly seastar: North Western Australia
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Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea (/ ˌ æ s t ə ˈ r ɔɪ d i ə /). Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. Starfish are also known as asteroids due to being in the class
The starfish can begin the metamorphosis into an adult once its characteristic radial symmetry is developed. Right after metamorphosis, the critter has a diameter of about 0.85 mm. Initial growth of the starfish is slow until the addition of the 6th arm, but once that happens, the addition of new arms occurs more rapidly.
There are five fundamental symmetry classes which have triangular fundamental domains: dihedral, cyclic, tetrahedral, octahedral, and icosahedral symmetry. This article lists the groups by Schoenflies notation , Coxeter notation , [ 1 ] orbifold notation , [ 2 ] and order.
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Symmetry in biology refers to the symmetry observed in organisms, including plants, animals, fungi, and bacteria. External symmetry can be easily seen by just looking at an organism. For example, the face of a human being has a plane of symmetry down its centre, or a pine cone displays a clear symmetrical spiral pattern.
Police in New Haven said a passerby spotted a baby seal in the middle of the city on Sunday -- and it's still a mystery how the cute critter got there.