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Invertebrate Presentation
By: Liam Gomez and Dom
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General Description Second largest phylum Largest marine phylum
85,000 different species Highly diverse
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Symmetry Bilateral Symmetry – Meaning the two sides are related
Both sides when split in two are mirror images of each other Symmetry
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Feeding herbivores, carnivores, scavengers, deposit feeders, filter feeders or parasites. Digestive system has two openings
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Circulation Mollusks have an open circulatory system.
Blood flow is not restricted to blood vessels and flows freely throughout the body
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The Mollusca excretory process involves the organ of the kidney
The Mollusca excretory process involves the organ of the kidney. This organ filters waste from the organism from the blood. Most of the species within the phylum also have an organ called the nephridium, which help maintain a balance of fluids within the body Excretion
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Response Complexity of nervous system varies greatly; extremely simple in clams, but complex in some octopi
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Movement Varies greatly by group. Some never move as adults, while others are very fast swimmers
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Reproduction Sexual; many aquatic species have free-swimming trochophore larval stage
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Gills inside Mantle cavity
Respiration Gills inside Mantle cavity
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Names of classes and examples of each molluska
GASTROPODA (single shelled cowries, cones etc) BIVALVIA ( two shelled like clams, mussels etc) APLACOPHORA (solenogasters) MONOPLACOPHORA (segmented limpets) POLYPLACOPHORA ( or Amphineura as it was earlier called- Chitons) SCAPHOPODA (tusk shells) CEPHALOPODA (nautilus, squids, Cuttelfish, octopus etc)
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