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Cambrian and ordovician key words

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Jon Houseman

Cambrian and Ordovician Period KeywordsAcoelomate The body plan of bilaterally symmetrical organisms which lack a coelomThere is no body cavity between the body wall and the gutThe layer orientation is endodermmesodermectoderm Algal matsA layer of filamentous algae on the marine or fresh water soft bottomsBlocked burrowers in early cambrianAmebocyteA mobile amoebalike cell which is found in the body of inverterbratesIt is similar to white blood cells which is found in vertebrates In many species amebocyes are found in the blood or body fluid and plays a role in the defense against pathogensIn sponges cells found in the mesophyl can transform into specialized types of cells Once sperm enter the sponge the amoebocye will help direct it to the egg to fertilize Also when nutrients are gathered by the choanocytes they amoebocytes with transfer it to other parts of the spongeArchenteronendoderm lined cavity of an embryo that forms the primitive gut BlastoporeDeveloping digestive tube of an embryo forms archenteron during coelom formation in deuterostomesthe body cavity pinched off by outpocketings of the archenteronArcheocyte sponge stem cells that form an eggtype of amoebocyte capable of developing into other cellsEx Reproductive cells also called amoebocyte are totipotent meaning they can differentiate into any cellcan become eggs to be fertilized from choanocytes from another sponge amoebocyte passes sperm to egg to be fertilized Annelida however it is in the long answerThe wormsThey have a new feeding and motility methodThey metamorized meaning they had repeating identical stuctures throughout the bodyThey have setae spikes in the skin and as the c muscle extended the spikes would anchor in the detritus and l muscles would puch it forward and stick out spikes then pulls its rearAlso as it moved it would eat the detritus and obtained its energy from thereAsymetric body planLack of proportion in special arrangements or placements of parts Not symmetricalThese are the sponges some might have symmetry Bilateral symmetry body planBody plan of animals which splits the organism in half evenly through the centersThese include the triploblastic animals diplo have radial symmetry
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