Tentaculites: Evidence for a Brachiopod Affinity?

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Science  18 Aug 1978:
Vol. 201, Issue 4356, pp. 626-628
DOI: 10.1126/science.201.4356.626


Transmission electron microscope studies of fractured surfaces reveal that the shells of Tentaculites are constructed of calcite with a ridge and groove structure and cross-bladed fabric heretofore unique to some articulate brachiopods. A possible affinity with brachiopods or phoronids is suggested for Tentaculites.