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Bio1130 Cambrian and Ordovician periods

Bio1130 Cambrian and Ordovician periods - Acoelomate a body...

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Acoelomate – a body plan of bilaterally symmetrical animals that lack a body cavity (coelom) between the gut and the body wall *Bilateral symmetry body plan – the body plan of animals in which the body can be divided into mirror image right and left halves by a plane passing through the midline of the body Blastopore – the opening at one end of the archenteron in the gastrula that gives rise to the mouth in protostomes and the anus in deuterostomes Blastula – the hollow ball of cells that is the result of cleavage divisions in an early embryo Cephalization – the development of an anterior head where sensory organs and nervous system tissue are concentrated Choanocyte – one of the inner layer of flagellated cells lining the body cavity of a sponge *Choanoflagellate – a group of minute, single-celled protists found in water, the flask- shaped body has a collar of closely packed microvilli that surrounds the single flagellum by which it moves and takes in food Cnidocyte – a pre-capturing and defensive cell in the epidermis of cnidarians Coelom formation – a fluid-filled body cavity in bilaterally symmetrical animals that is completely lined with derivatives of mesoderm Coelomate – a body plan of bilaterally symmetrical animals that have a coelom Deposit (Substrate) feeders – an animal that consumes particles of organic matter from
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