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12 Cards in this Set
- Front
- Back
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how do nematodes achieve body support?
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By their hydrostatic skeleton
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Explain how Nematodes move.
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Movement is aided by four sets of longitudinal muscles. Contractions of these muscles enable movement in a dorsal-ventral plane.
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What is Eutely? Name a phylum in which is occurs.
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Constancy in cell number. All individuals of a species have the same # of cells and growth occurs by the cells getting larger rather than by dividing.
P. Nematoda |
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In spring, rotifer females reproduce by a process known as ___________.
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Parthenogenesis (Amictic Cycle)
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What are metameres? Name a class of metameric Annelids.
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Repeated segments, lying in a longitudinal series, that compose the body Annelids
C. Polychaetes |
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What are tagma? Explain how tagmatization relates to metamerism
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Tagmatization is the specialization of formerly metameric segments in form and function. Tagma is the fusion of these segments into seperated bodily regions. This is related to metamerism b/c once the tagma is separated, the metameres are repeated, each with the same organ system.
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In annelids, where are two coelomic spaces found? Name an organ found within the coelom
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B/t two layers of mesoderm. Heart.
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What is the large fluid-filled space in a crustacean called? where is the true coelom found?
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Hemocoel.
In the "green glands" |
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Biramous
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Consisting of or having TWO branches, as the appendages of an arthropod. Ex. exopod and endopod of crustacean.
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Homology
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Structures on different species that arouse from common ancestors.
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Tagmatization
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The specialization of formerly metameric segments in form and function.
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Tagma
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The fusion of metameric segments into separated bodily regions
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