telson -- The last segment of the abdomen in many arthropods. May be flat and paddlelike, buttonlike, or long and spiny, as in the horseshoe crabs.
telson Posterior projection of the last body segment in many crustaceans.
temnospondyls A large lineage of amphibians that extended from the Carboniferous to the Triassic.
The long, unsegmented telson projects to the rear. They possess book gills that resemble the pages in a book. Limulus is considered a living fossil due to its great similarity to fossil forms from the Paleozoic Era.
 See also: Mammals, Shell, Segment, Organ, Human
  
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