Feather stars and sea lilies are echinoderms classified within Class Crinoidea. They easily capture the hearts of new and seasoned hobbyists alike, and find their way into home aquariums due to their beautiful outer appearance and the graceful way they swim, quite unlike any other creature.While crinoids may be gorgeous and seem as if they would make the perfect centerpiece for an aquarium of suitable size, they very rarely thrive in captivity, and, while mortality rates have not been documented...

Members of Phylum Porifera, commonly referred to as sponges, are well-known as the most primitive multicellular animals, with fossil records exceeding 580 million years. Presently, there are almost 10,000 extant species globally distributed. This is quite interesting, particularly considering the fact that even extant sponges are widely considered to be the simplest of all animals. To mention only a few traits that characterize the basic anatomy of the vast majority of species, the iconic porous...

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