class Clitellata
Transcript of class Clitellata
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PRESENTED BY:
HINA AMIR
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Class Clitellata• Include earthworms and leaches.
Symplesiomorphic Characters:
1. Clitellum for cocoon formation.
2. Few or no setae.
3. Monoecious
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Subclass Oligochaeta
• 3,000 species• Aquatic as well as terrestrial.• Include earthworms.
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External Structure
• Few Setae.• Prostomium having small lobe.• Clitellum.• Cuticle.
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Locomotion
• Antagonism of circular and longitudinal muscles.
• Burrowing ……..Coelomic hydrostatic pressure.
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Feeding and digestive system
• Scavenger .• Depend on fallen and decaying vegetation. Digestive system:• Tubular and straight.• Mouth Pharynx crop gizzard calciferous
gland Anus• Typhlosole.
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Gaseous exchange and Circulation• Respire through body wall. CIRCULATION• The blood system is a closed system.• Blood…..head to the tail in the ventral vessel tail to the head….. in the dorsal vessel• Photoreceptors are present
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Nervous system
–Dorsal brain–Pair of nerves on sides of esophagus–Paired ventral nerve cords with paired
ganglia in each segment–Transverse nerves connect ganglia in
each segment
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Excretion: Metanephridia
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Reproduction:
• Monoecious. Sexual reproduction• Through copulation….. cocoon formation.
Asexual reproduction• Transverse division• Regeneration of parts