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12 Cards in this Set

  • Front
  • Back
how do nematodes achieve body support?
By their hydrostatic skeleton
Explain how Nematodes move.
Movement is aided by four sets of longitudinal muscles. Contractions of these muscles enable movement in a dorsal-ventral plane.
What is Eutely? Name a phylum in which is occurs.
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
In spring, rotifer females reproduce by a process known as ___________.
Parthenogenesis (Amictic Cycle)
What are metameres? Name a class of metameric Annelids.
Repeated segments, lying in a longitudinal series, that compose the body Annelids
C. Polychaetes
What are tagma? Explain how tagmatization relates to metamerism
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.
In annelids, where are two coelomic spaces found? Name an organ found within the coelom
B/t two layers of mesoderm. Heart.
What is the large fluid-filled space in a crustacean called? where is the true coelom found?
In the "green glands"
Consisting of or having TWO branches, as the appendages of an arthropod. Ex. exopod and endopod of crustacean.
Structures on different species that arouse from common ancestors.
The specialization of formerly metameric segments in form and function.
The fusion of metameric segments into separated bodily regions