GROWTH METRIC—A QUANTITATIVE INDEX FOR BRACHIOPOD ALLOMETRY RESEARCH
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Abstract:
The term "Growth metric" is introduced in this paper to measure the degree of ontogeny for research about the allometry of brachiopods. The metric is calculated by length, width and thickness of shell with their separate weights. Regression analysis for the measurements together with growth metric of some shell’s dimensions of brachiopods can provide evidences for existence of allometry for the fossil population. A case study on Rongatrypa xichuanensis, a Katian(Late Ordovician) atrypide species, indicated that isometry of shell width, negative allometry of shell length and positive allometry of shell thickness can be detected by the statistics study on growth metric for the species.
