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15 Cards in this Set
- Front
- Back
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Body type.
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Coellum reduced.The molluscan coelom is
. very small and largely restricted to the area surrounding the heart and gonads. |
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Circulatory system?
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Open circulatory system. Consisting of a heart/pump but no well formed vessels.
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Adaptive radiation?
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many new
organisms evolvefrom a common ancestor. |
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Tissue type?
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Triploblastic.
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Symmetry?
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Bilateral.
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Body cavity?
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Eucoelomate.
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Digestive System?
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One way tract, mouth >>>anus.
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Nervous System?
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Nervous system –
– cephalization present in some members of this phyla (eg the octopus) but not in others (such as the oysters). |
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Mollusca body is composed of?
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Head foot, mantle, and visceral mass.
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Blood sinuses?
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There are also blood sinuses in the mollusc
that comprise a hemocoel (blood cavity). These are full of blood and serve as a hydrostatic skeleton in some molluscs. |
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Nervous system?
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Well developed eyes and nervous system.
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Visceral mass?
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visceral mass –
containing the digestive system, circulatory, excretory, and reproductive systems. |
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Mantle?
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secretes a
shell. Shell characteristics vary between classes. |
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Filter feeding?
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Cilia covering the gills pull water in from outside through the incurrent siphon.
2. It passes through the gill filaments and is filtered. 3. Filtered water passes out the excurrent siphon.As the gills filter the water, they also trap food. Cilia on the surface of the gills, beat so as to direct the trapped food toward the palps, where it is gathered into a food bolus and pushed into the mouth. |
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What happens to different particles that are carried in by the cilia.
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Heavy particles of sand or mud simply drop from the surface of the gills and are carried by
cilia on the mantle and are expelled through the excurrent siphon. The smaller particles become entangled in mucus and are carried by the cilia to the ventral edge of the gill and then forward until they meet the ciliary tracts on the palps which leads directly into the mouth. |
