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- W2022182752 abstract "We analyzed the morphological relationship between Echinolampas appendiculata, Rhyncholampas carolinensis and Eurhodia rugosa from the middle Eocene Castle Hayne Limestone in southeastern North Carolina. We also investigated the heterochronic relationship between R. carolinensis and E. rugosa. Specimens were analyzed quantitatively using a truss consisting of 18 distinct morphological measurements. Principle component analysis (PCA) of these data indicated that the three groups are morphologically distinct. The analysis also showed that the groups shared parallel growth trajectories. Together with the PCA analysis, bivariate analyses showed a strong heterochronic relationship between R. carolinensis and E. rugosa. Additionally, statistical analysis of the data indicated Echinolampas appendiculata exhibited the most morphological variability among the three groups. Extinct and extant members of the three genera were found to inhabit fairly distinct water depths and substrates, thus the groups may have divided up their environment according to water depth. In light of the morphological results and phylogenetic data we speculate that Rhyncholampas carolinensis and Eurhodia rugosa initially diverged from a Rhyncholampid ancestor. Competition between the variable E. appendiculata and a morphologically similar Rhyncholampid species may have provided the selective pressure for the evolution of the relatively deep-water cassiduloid Eurhodia." @default.
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- W2022182752 date "2007-12-01" @default.
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- W2022182752 title "Heterochrony within the cassiduloid echinoids from the Castle Hayne Limestone of Southeastern North Carolina" @default.
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- W2022182752 doi "https://doi.org/10.1080/08912960701322518" @default.
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