phylum annelida. characteristics protostomia, eucoelomates metamerism (= unspecialized...
DESCRIPTION
Systems IntegumentIntegument- epidermis is one cell layer with mucous gland that secrete a moist cuticle. SkeletalSkeletal -hydrostatic (using coelom) MuscleMuscle- longitudinal and circular muscles Each segments muscles are independent of the other segments. DigestiveDigestive- complete, complex, with typhlosole for absorption and chloragogen cells acting as digestive gland and excretory cells.TRANSCRIPT
Phylum Annelida
Phylum Annelida
• Characteristics Protostomia, eucoelomates Metamerism (= unspecialized
segmentation) In the Classes:
Parapodia Clitellium
Systems
• IntegumentIntegument- epidermis is one cell layer with mucous gland that secrete a moist cuticle.
• SkeletalSkeletal -hydrostatic (using coelom)• MuscleMuscle- longitudinal and circular muscles Each
segments muscles are independent of the other segments.
• DigestiveDigestive- complete, complex, with typhlosole for absorption and chloragogen cells acting as digestive gland and excretory cells.
Systems (continue)• ExcretoryExcretory- a pair of nephridia per segment.• RespiratoryRespiratory -through skin, some through parapodia;
tubeworms have gills.• CirculatoryCirculatory- closed system, use hemoglobin as oxygen
carrier.• NervousNervous- dorsal brain; ventral, double, solid nerve cord,
with ganglia in each segment.• EndocrineEndocrine- hormones secreted by nervous system.• ReproductiveReproductive-
Dioecious (Separate Sexes) Male and Female in Polychaeta; no special organs, posterior end becomes gonads.
Monoecious (Contains both Eggs and Sperm) in Oligochaeta and Hirudinea; Clitellium.
Annelida Taxonomy
• Phylum Annelida (an-nel-i-da) Class Polychaeta (poly-key-ta)
• Nereis, Aphrodita, Chaetopterus, Arenicola, Amphitrite
Class Oligochaeta (ol-e-go-key-ta)• Lumbricus, Tubifex
Class Hirudinea (hi-ru-din-e-a)• Hirudo, leech
• Earthworm dissection
Click on any term that is underlined to go to that slide
Nereis (clam worm)
Nereis
Nereis
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Aphrodite (sea mouse)
ventral
dorsal
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Other Polychaetes
Chaetopterus
Arenicola (Lug worm)
Amphitrite (plum worm)
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Hirudo (leech)Return to taxonomy
Lumbricus
Lumbricus
dorsal
ventral
clitellium
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Earthworm DissectionReturn to taxonomy
Cross section
Earthworm cross sectionReturn to taxonomy