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29 Cards in this Set
- Front
- Back
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Phylum Annelida
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-Lophotrochozoan Protostome
-Trochophore larvae -complete digestive tract -hydrostatic skeleton |
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Annelida Body Composition
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composed of segment seperated by septa
* body can be manipulated individually |
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Anterior and posterior end of annelida
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anterior- has a prostomium
posterior- has pygidium |
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setae
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hair-like spikes that can be used to grip sediment
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terrestrial worms vs aquatic worms
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terrestrial have SHORT HARD setae
aquatic have LONG FLEXIBLE setae |
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outermost layer of annelids
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have flexible outer cuticle that is secreted by the epidermis
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respiration of annelids
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-mainly diffusion across the skin/cuticle
-have gills as accessory structures |
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excretory system
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paired nephridia in each segment
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reproduction
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sexual- can be monoecious OR dioecious, larvae are trochophore
asexual- budding and fragmentation |
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Class Oligochaeta
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-earthworms
-respiration: diffusion ONLY, no gills etc. -CLOSED circulatory system in most organisms; use hemoglobin to transport oxygen & have amoeboid cells. |
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Oligochaeta Digestive tract
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COMPLETE digestive system: mouth, pharyx, esophagus, crop, gizzard
crop-storage gizzard-breaks up food like teeth would |
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typhlosole
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Ridge that hangs down in the middle of the digestive tube. Purpose is to INCREASE SURFACE AREA.
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nephridia
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-general term for excretory system that empty OUTSIDE the organism
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protonephridia
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tubes ending at flame cells
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metanephridia
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tubes take in coelomic fluid and releases waste outside the body through a nephridiopore
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compound oligonacheta use for excretory system
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urea
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nervous system
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-have cephalization
-bi-lobbed brain -ventral nerve chord -pair of ganglia branch off each segment -NO EYES but have simple photoreceptors |
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reproduction
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-hermaphroditic
-cross-fertalize with another worm -NO trochaphore larvae |
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Class Polychaeta
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-clam worms
-most of the diversity in this phylum |
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difference between polychaeta vs terrestrial worms
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-have parapodia to increase surface area for respiration as well as move up and down
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polychaeta sensory system
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-well developed head
-have simple eyes -statocyst-orientation -have chemoreceptors |
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feeding of polychaeta
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-some are predatory
-others are filter feeders OR deposit feeders |
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polychaeta defense tactic
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burrow in sediments
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reproduction of polychaeta
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-no permanent sex organs
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atoke
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anterior reproductive section
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epitoke
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posterior reproductive section
-separates from atoke and swims to surface to release gametes |
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Class Hirudinida
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-leeches
-mostly freshwater |
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Body Plan of Hirudinida
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-usually 34 segments
-septa between segments is LOST -sucker at both ends -dorsoventrally flattened -NO setae |
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digestive tract of Hirudinida
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-can store large volumes of blood from host
-release hirudin into wound to stop host blood from clotting |
