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35 Cards in this Set
- Front
- Back
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Invertabrates |
animals that lack a backbone |
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Animal Kingdom |
Is currently divided into 35 groups |
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For Molecular comparisons, it is assumed that the more closely related two organisms are |
the more nucleotide sequences they will have in common |
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Asymmetrical |
animals that have no particular symmetry |
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Radial Symmetry |
animals that are organized circularly, similar to a wheel, so that no matter how animal is sliced longitudinally mirror images are obtained |
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Bilateral Symmetry |
the animals have definite right and left halves only a longitudinal cut down the middle of the animal will produce mirror images |
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sessile |
Free floating |
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Cephalization |
localization of a brain and specialized sensory organs at the anterior end |
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What are the three tissue layers |
ectoderm, endoderm, mesoderm |
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Protosomes |
animals with three tissue layers that have a mouth to appear at or near the blastopore |
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Deuterosome |
animals with three tissue layers that have an anus to appear at or near the blastopore |
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Ecdysozoa |
a group of deutersomes that molt and shed their outer covering as they grow |
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Lophophorans |
a group of deutersomes that also shed their outer covering but have a mouth surrounded by cilliated tentacle lime strctures |
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Trochophores |
animals which either currently have or their ancestors had a trochophore larva |
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Sponges |
(phylum Porifera) have sac like bodies that are perforated by many pores |
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collar cells |
In sponges, the inner layer that is composed of flagellated cells |
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filter feeder |
An organism that filters its food from the water by means of a straining device. |
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Hermaphorditic |
meaning they possess both male and female sex organs |
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spicules |
small needle shaped structures with one to six rays |
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Comb Jellies |
(phylum Ctenophora) are solitary free swimming marine invertebrates that are found primarily in warm waters |
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Mesoglea |
The jellylike substance that makes up comjellies consistency |
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Cnidarians |
(Phylum Cnidaria) tubular bell shaped animals that reside mainly to shallow coastal waters |
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Enidocytes |
The term cnidaria is derived from the presence of specialized stinging cells |
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Nematocyst |
Each Cnidocyte has a toxic filled capsule called |
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Gastrovascular Cavity |
The inner tissue layer that is derived from endoderm, secretes digestive juices into the internal cavity |
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Polyp |
among cnidarians body form that is directed upwardand contains much mesoglea |
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Medusa |
among cnadarians bell shaped body form that is directed downward and contains much mesoglea |
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Hydra |
The body of a hydra is a small tubular polyp about 1 quarter inch in length. |
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Trochozoans |
Protosomes that either have a trochophore larva today or an ancestor had it in the past. |
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Flatworms |
(phylum Platyhelminthes) are worms that have extremely flat bodies |
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Flame cells |
named because of the beating cilia reminded early investigators of the flicker of a flame |
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Tapeworms |
are endoparasites or internal parasites of various vertebrates including humans |
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scolex |
the well developed region of a tepeworm |
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Proglotids |
a series of reproductive units with a full set of male and female sex organs |
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Gravids |
Contain fertilized eggs, break away and are eliminated in the host feces |
