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Home > Art, Film & Photography > Annelids: Machaerid, Annelid, Earthworm, the Formation of Vegetable Mould Through the Action of Worms, List of Prehistoric Annelids, Clitellata
Annelids: Machaerid, Annelid, Earthworm, the Formation of Vegetable Mould Through the Action of Worms, List of Prehistoric Annelids, Clitellata

Annelids: Machaerid, Annelid, Earthworm, the Formation of Vegetable Mould Through the Action of Worms, List of Prehistoric Annelids, Clitellata


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About the Book

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 25. Chapters: Machaerid, Annelid, Earthworm, The Formation of Vegetable Mould through the Action of Worms, List of prehistoric annelids, Clitellata, Haplodrili, Scolecodont, Nightcrawlers, Markuelia, Plumulites canadensis, Appendiculata, Xystoscolex, Viscid sac. Excerpt: The annelids (also called "ringed worms"), formally called Annelida (from French annel?'s "ringed ones," ultimately from Latin anellus "little ring"), are a large phylum of segmented worms, with over 17,000 modern species including ragworms, earthworms and leeches. They are found in marine environments from tidal zones to hydrothermal vents, in freshwater, and in moist terrestrial environments. Although most textbooks still use the traditional division into polychaetes (almost all marine), oligochaetes (which include earthworms) and leech-like species, research since 1997 has radically changed this scheme, viewing leeches as a sub-group of oligochaetes and oligochaetes as a sub-group of polychaetes. In addition, the Pogonophora, Echiura and Sipuncula, previously regarded as separate phyla, are now regarded as sub-groups of polychaetes. Annelids are considered members of the Lophotrochozoa, a "super-phylum" of protostomes that also includes molluscs, brachiopods, flatworms and nemerteans. The basic annelid form consists of multiple segments, each of which has the same sets of organs and, in most polychaetes, a pair of parapodia that many species use for locomotion. Septa separate the segments of many species, but are poorly-defined or absent in some, and Echiura and Sipuncula show no obvious signs of segmentation. In species with well-developed septa, the blood circulates entirely within blood vessels, and the vessels in segments near the front ends of these species are often built up with muscles to act as hearts. The septa of these species also enable them to cha...


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Product Details
  • ISBN-13: 9781156764756
  • Publisher: Books LLC, Wiki Series
  • Publisher Imprint: Books LLC, Wiki Series
  • Height: 246 mm
  • No of Pages: 26
  • Spine Width: 1 mm
  • Weight: 68 gr
  • ISBN-10: 1156764750
  • Publisher Date: 29 Aug 2011
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: Machaerid, Annelid, Earthworm, the Formation of Vegetable Mould Through the Action of Worms, List of Prehistoric Annelids, Clitellata
  • Width: 189 mm


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