Oligochaeta_S08

Oligochaeta_S08 - ZOO 115 Invertebrate Zoology Phylum...

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ZOO 115 Invertebrate Zoology Phylum Annelida Class Clitellata Subclass Oligochaeta
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http://www.ahc.gov.au/publications/pnh/images/ea10597.jpg Subclass Oligochaeta - General Characteristics > 3500 species Most terrestrial or freshwater but about 200 marine species Includes earthworms 3m Australian earthworm
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Subclass Oligochaeta - General Characteristics They have few chaetae Usually simple with typically four bundles per segment. retractable http://www.infovisual.info/02/img_en/007%20Internal%20anatomy%20earthworm%20cross.jpg Retractor muscle Protractor muscle
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Subclass Oligochaeta - external anatomy http://www.howe.k12.ok.us/~jimaskew/botzo /wormx.gif
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Subclass Oligochaeta - locomotion Like Polychaetes - have septae separating segments into compartments making peristalsis more efficient. Musculature similar to Polychaetes During dry seasons and winters, earthworms burrow deeper (up to 3m) Become dormant (diapause) and dehydrated
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Subclass Oligochaeta - Nervous system Brain Ventral Nerve Cord
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Oligochaeta_S08 - ZOO 115 Invertebrate Zoology Phylum...

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