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Journal Article

Ultrastructure and Composition of Brown Bodies in Some Ordovician Trepostome Bryozoans

Stanley J. Morrison and Robert L. Anstey
Journal of Paleontology
Vol. 53, No. 4 (Jul., 1979), pp. 943-949
Stable URL: http://www.jstor.org/stable/1304117
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Ultrastructure and Composition of Brown Bodies in Some Ordovician Trepostome Bryozoans
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Abstract

Brown bodies in Ordovician trepostome bryozoans are permineralized pseudomorphs of the original brown bodies, which were degeneration remnants of the soft tissues of the polypide. Ordovician brown body cellular grains appear in light micrographs as mottled, puffy spheroids, and are morphologically indistinguishable from those in Holocene brown bodies. They also contain organic compounds, based on positive histological staining and high carbon concentrations determined from electron microprobe analysis. However, no cellular fine structure has been preserved. Transmission electron microscopy indicates that they are extensively permineralized by a bladelike mineral, probably an authigenic aluminosilicate.

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