1979 Edition


  • William A. S. Sarjeant
Reference work entry

Anellotubulates, “ring-tubers,” are tubular structures of microscopic size, creamy white to brownish in color, and composed of a phosphatic material. Their outline may be trumpet shaped to bell shaped, vermiform, or in the form of a parallel-sided or irregularly swollen tube. The outer walls may be roughened or may show annular lines; the inner wall is typically smooth. The size of these structures is in the range of 200–1000 μm (Fig. 1).

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Copyright information

© Dowden, Hutchinson & Ross, Inc. 1979

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  • William A. S. Sarjeant

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