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Cambrian and Ordovician Key Words.doc

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Cambrian and Ordovician PeriodsTermDefinitionKey PointsAcoelomateAnimals without a body a without koiloma cavity that seperates the cavitygut from the muscles of the Example flatwormbody wall Instead a mass of cells derived largely from mesoderm packs the region between the gut and the body wallAlgal matsPrevented the earliest animals from burrowing into the sedimentPrecambrian ocean bottom was covered in theseAmebocyteArcheocyteBecome eggs in spongesAssymetric body planBody plan that is irregular Example Spongesin shape and cannot be divided into equal partsBilateral symmetry body A body plan that has left Also have front and planand right sides that are back ends as wells mirror images of each other as upper and lower on either side of the bodys surfacesmidlineStart to develop motionBivalveClass that includes clams Bi two valv scallops oysters and folding doormusselsMuscle relaxes opens shell muscle contracts closing shellClamsBurrow in substrateFilter feedBlastoporeThe opening at one end of An opening that the archenteron in the connects to a gastrula that gives rise to developing gutthe mouth in protstomes Later in and the anus in development a deuterostomessecond opening at the opposite end of the embryo transforms the pouchlike gut into a digestive tubeBlastulaThe hollow ball of cells that is the result of cleavage divisions in an early embryoBryozoaLive in colonieslorophorates feeding structuresBuild reefsReefs Prime productivity areaBurgess Shale fossilsFossils that can be found Discovered by at Yoho national park in BCCharles Walcott in 1909Formed from a mudslide that buried the animals in a fine silt preserving the fossilsTrilobitesMost complete set of soft invertebrate fossilsCambrianPeriod that began about Beginning of 540MAcontinentsAnimals start to diversify in OceansMulticellular animals invertebrates Cambrian burrowersPriapulidsEat food in the substrate bottom of ocean
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