Application of geometric morphometrics to the study of shape polymorphism in Eocene ostracodes from Egypt and Spain

摘要: Methods of geometric morphometrics applied to Eocene ostracodes from Wadi El Rayan, Eastern Desert, Egypt, and Aragon region, Spain, enable ostracode workers define the size shape variation in these following manner. Loxoconcha vetustopunctatella Bassiouni, Boukhary, Shamah Blondeau displays different parameters. The relative warps thin-plate spline analyses led recognizing five morphs (morph 1 morph 5) within this species. defined could be arranged according their degree similarity (the typical morph), where 4 is closest form 1, followed by 5, 2 3, respectively. On other hand, analysis three species Echinocythereis (E. isabenana Oertli, E. aragonensis posterior Oertli), using analyses, arrived at same conclusions Reyment (1985, 1988) showing that speciation events were accompanied significant change shape. However, have advantage over techniques used identifying shape-patterns. Current results indicate benefits can expected accrue applied, as superior any relevant technique, solve problems arising polymorphism not only but also crustaceans.