What in Darwin’s Name Are Chaetognaths?!

Lynn Margulis classified the Chaetognaths, known as arrow worms, as deuterostomes. Deuterostomy is characterized by  several developmental characteristics including radial, indeterminate cleavage, a posterior position…

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Huge Silicate Sponge Spicules and the Evolution of Calcification

The deep-sea sponge Monorhaphis chuni (Hexactinellida) has the world’s largest known biosilica structure! A silicate spicule that can grow up to 3 meters long. That’s…

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