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Related Flashcards
Cards In This Set
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Phylum Platyhelminthes Class Turbellarians are what kind of organisms?
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Planarians
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Where can you find them?
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Freeliving_ nearly all aquatic
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Describe the epidermis:
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Ciliated epithelium with rhabdites that discharge mucus (used in locomotion, attachment and prey capture)
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Describe the mesoderm:
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Becomes muscle layers with parenchymal cells, neoblasts and reproductive organs
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Describe the gastrodermis:
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Has secretory and nutritive cells
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How is locomotion accomplished?
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By cilia or muscular action
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Describe feeding and digestion:
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Carnivores with sac body plan. mouth is ventral with pharynx to ingest food.
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Describe the nervous system:
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Varies from nerve plexus in Acoela to ladder system with cerebral ganglion in Polycladida
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What kinds of sensory organs do they have?
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Ocelli, chemoreceptors, tactile receptors, rheoreceptors, and statocysts
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Give an example of a Turbellarian.
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Dugeseia spp.
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What organisms come from Class Monogenea?
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Small ectoparasites with direct life cycles (require one host) they are monogenetic flukes
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What do monogeneas parasitize?
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Fish, frogs, turtles with some within the body cavities (lower aquatic vertebrates)
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Where is the opisthaptor and what is it?
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Posterioventral side of the body and it is a holdfast
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What are the larva called in Class monogenea?
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Oncomiracidium
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Give an example of Class Monogenea.
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Polystoma integerrium: in frog bladder; its lifecycle is linked to the kairmones of the frog
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