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Midterm

BIO2135 2nd midterm keywords.docx

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Department
Biology
Course
BIO2135
Professor
All Professors
Semester
Winter

Description
ndBIO2135 2 midterm keywordsBRYOZOAAncestrula The founding zooid that undergoes asexual budding to form a bryozoan colony Bryozoa The moss animals a major phylum of sessile aquatic invertebrates occurring in colonies with hardened exoskeleton Bryozoans have a tripartite coelom with a prosoma protocoel the most anterior coelom that in some species forms a flap the epistome next to the mouth the mesosome the lophophore that extends through the opening of the casing and the metasome which includes the rest of the body inside the protective case Unlike the other lophophorates bryozoans can extend and retract their lophophore through an opening in some species protected by an operculum Cardiac stomach Cecum a blind pouchlike commencement of the colon in the right lower quadrant of the abdomen at the end of the small intestine The appendix is a diverticulum that extends off the caecum The cecum marks the beginning of the large intestine and is basically a big pouch that receives waste material from the small intestine Coleom A true body cavity completely lined by mesoderm which forms the peritoneum Animals with true coeloms are referred to as eucolomates Cystide In bryozoan ectoproct colonies the cystid consists of the nonliving shell or casing and the living part of the animal that secretes the casing The cystid doesnt include the lophophore and the part of the body that moves inside the cystid Ectoprocta An order of Bryozoa in which the anus lies outside the circle of tentacles They were formerly placed in the phylum Bryozoa along with the Entoproctawhich they superficially resemble Ectoprocts are a large and ancient group dating from the Ordovician There are about 5000 living species Enterocoleus a coelom originating by outgrowth from the archenteron Epistome Flaplike covering of the oral opening in lophophorates Formed from the protocoel it may or may not have a coleomic cavity inside Eucoelomate Coelomate Organisms that possess a true coelom with mesoderm lining the whole body cavity unlike pseudocoelomates where the mesoderm is adjacent only to ectodermal tissue Funiculus A cord connecting the digestive system and wall of a zooid in some bryozoan colonies It may be important in exchange of materials between individuals in the colony Lophophorate Group of animals that have a lophophore ring of hollow ciliated tentacles surrounding the mouth Lophophore A unique double ring of hollow ciliated tentacles that surround the oral opening in a number of animal phyla There is some debate as to whether these should be separate phyla and many consider the lophophore to be a unique character of the phylum Lophophorata Lophotrochozoa A new taxon supported by molecular evidence and includes all the animals with a lophophore or a trochophore larval stage Lophotrochozoans and ecdysozoans animals with a cuticle no epidermal ciliature and who molt are combined as the protostomes in traditional evolutionary classification of animals Mesocoel The middle of three coelomic spaces found in the tripartate body plan characteristic of the deuterostome lineage of animals The other coelomic compartments are the protocoel and metacoel Metacoel The last of three coelomic spaces found in the tripartate body plan characteristic of the deuterostome lineage of animals The other coelomic compartments are the protocoel and mesocoel Polypide The soft part of the ectoproct bryozoan that includes the visceral mass and the lophophore and can be retracted into the cystid Protocoel The first of three coelomic spaces found in the tripartate body plan characteristic of the deuterostome lineage of animals The other coelomic compartments are the mesocoel and metacoel Pyloric stomachpyloric sphincterThe ring of muscle at the junction of the stomach and small intestine that regulates the movement of food into the small intestine
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