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Rib Branching Patterns in the Brachiopod Atrypa reticularis from the Silurian of Gotland, Sweden

Charles W. Harper, Jr.
Journal of Paleontology
Vol. 43, No. 1 (Jan., 1969), pp. 183-188
Stable URL: http://www.jstor.org/stable/1302361
Page Count: 6
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Abstract

Analyses of correlation coefficients comparing the surface rib branching patterns of individuals of Atrypa reticularis from four horizons appear to indicate a progressive increase during the Late Silurian in the homogeneity of the rib branching patterns in Gotland populations of this species.

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