Transcript Phylum Annelida BIO 2215 Oklahoma City Community College Dennis Anderson Segmented Worms • Body divided into repeating segments.

Phylum Annelida
BIO 2215
Oklahoma City Community College
Dennis Anderson
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Segmented Worms
• Body divided into
repeating segments
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Sedentary
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Terrestrial
• Earthworm
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Feed on Blood
• Leech
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Uniramia
Echinodermata
Chelicerata
Vertebrata
Lophophores
Crustacea
Other Chordata
Arthropoda
Annelida
Hemichordata
Other
pseudocoelomates
Nematoda
Mesozoa
Sarcomastigophora
Ciliophora
Apicomplexa
Microspora
Mollusca
Nemertea
Platyhelminthes
Ctenophora
Cnidaria
Placozoa
Porifera
Myxozoa
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Phylum Annelida
• Segmented body
– metameric
• Setae
– Absent in leeches
• Coelom divided by
septa
• Closed circulatory
system
• Nephridia for each
segment (metamere)
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Circulatory Systems
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Metamerism
Pygidium
Septa
Prostomium
Peristomium
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Trochophore larva
Apical tuft
Stomach
Ciliary band
Mouth
Anus
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Annelid development
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Class Polychaeta
• Many setae
• Parapodia
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Class Polychaeta
Parapodium
Head
Tentacle
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Polychaete Worm
Predatory
Jaw
Tentacle
Palp
Everted pharynx
Eye
Cirrus
Parapodium
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Nereis
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Class Polychaeta
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Class Polychaeta
Fireworm
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Sedentary Polychaete Lugworm
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Pelagic* Polychaete
*Drift in the open ocean
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Class Oligochaeta
•
•
•
•
Few setae
Clitellum
No parapodia
Monoecious
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External Structures of an Earthworm
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Lumbricus terrestris
• Feed on decaying
organic matter
• Enrich soil
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Internal Structures of an Earthworm
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Body wall
Epithelium
Circular muscle
Longitudinal muscle
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Metanephridium
Dorsal
vessel
Bladder
Nephridiopore
Nephrostome
Ventral vessel
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Fig. 17.14
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Earthworm Reproduction
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Class Hirudinea
• Anterior & posterior
sucker
• No setae
• Most live in fresh
water
• Feed
– Invertebrates
– Body fluids
– Blood
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The End
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