ABSTRACT

This study provides quantitative and qualitative analyses for the brachiopod shells of the Genus Composita. For this study, 75 brachiopod specimens were collected from the Late Carboniferous Rod El-Hamal Formation that are exposed at Rod El-Hamal area, Wadi Araba, north Eastern Desert, Egypt. The collected brachiopod specimens belong to six species in genus Composita; Composita subtilita, C. subquadrata, C. ovata, C. ambigua, C. trilobata, and C. trinuclea. In order to distinguish the different species of Composita, morphometric analysis, using ImageJ and MorphoJ software packages, was applied. Morphometric analysis included landmark configurations, generalised procrustes analysis, principle component analysis, and thin-plate spline visualisation plots. In the Composita genus, the quantitative analysis proposed considerable variations along the posterior region.

摘要

本研究为菊属的腕足动物壳提供了定量和定性分析。在这项研究中，从晚石炭世 Rod El-Hamal 地层中收集了 75 个腕足动物标本，这些标本位于埃及东北部沙漠 Wadi Araba 的 Rod El-Hamal 地区。采集的腕足动物标本属于菊属6种；Composita subtilita、C. subquadrata、C. ovata、C. ambigua、C. trilobata和C. trinuclea。为了区分菊苣的不同品种, 形态测量分析, 使用 ImageJ 和 MorphoJ 软件包, 被应用。形态测量分析包括地标配置、广义 procrustes 分析、主成分分析和薄板样条可视化图。在Composita属中，定量分析提出了沿后部区域的相当大的变化。