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Annelid
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Description: This diagram shows a fresh-water annelid. a, appendages; br., brain; d, dissepiments; i, intestine; m, mouth; nph, nephridium; oe, aesophagus; p, pavilion, line with ciliated entoderm; ph., pharynx; pr., processes from the anal segment; z, zone immediately in front of the anal segment where new segments are continually being formed; z', the zone of fission or budding. This takes place in the middle of a segment. The anterior half-segment of z' will produce a region like z for the anterior half of the worm.
Source: Thomas Walton Galloway, Zoology A Text-Book For Secondary Schools, Normal Schools and Colleges (Philadelphia: P. Plakiston's Son & Co., 1913)
Keywords: Annelid, Nephridium,
Copyright: 2008, Florida Center for Instructional Technology. See license.
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