초록

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Abstract ▼ AI-Helper

The upper part of the Machari Formation in Galgol, Yeongwol yields a well-preserved trilobite assemblage of middle Furongian age which comprises 12 species belonging to 11 genera. Of note is the abundant occurrence of Pseudagnostus josepha (Hall, 1863) representing various ontogentic stages. This st...

The upper part of the Machari Formation in Galgol, Yeongwol yields a well-preserved trilobite assemblage of middle Furongian age which comprises 12 species belonging to 11 genera. Of note is the abundant occurrence of Pseudagnostus josepha (Hall, 1863) representing various ontogentic stages. This study deals with the ontogenetic development and morphometric analysis of Pseudagnostus josepha with growth. A total often growth stages are recognized: two and eight stages in the meraspid and holaspid periods, respectively. In the holaspid period, the relative length of the posteroaxis gradually increases with growth. Similar morphological change is also observed in co-occurring Peratagnostus orientalis. Morphometric analysis using landmark data suggests that this morphological change can be attributed to allometric growth in the axial region.

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