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).
An anellotubulate (“Mikrokalyx pullulans” of Wetzel) obtained by chemical treatment of German Lower Jurassic sediments; X800 (after Wetzel, 1967).
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References
McLachlan, I. R., 1973. Problematic microfossils from the Lower Karroo Beds in South Africa, Palaeontol. Africana, 15, 1–21.
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Richardson, G., Gregory, D., and Pollard, J., 1973. Anellotubulates are manufactured “microfossils,” Nature, 246, 347–348.
Wetzel, O., 1967. Rätselhafte Mikrofossilien des Oberlias (ε); Neue Fünde von “Anellotubulaten” O. We. 1957, Neues Jahrb. Geol. Paläontol., Abh., 128, 341–352.
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© 1979 Dowden, Hutchinson & Ross, Inc.
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Sarjeant, W.A.S. (1979). Anellotubulates . In: Paleontology. Encyclopedia of Earth Science. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-31078-9_7
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