Open Access
Morphology of Ordovician-Devonian Crinoids
Michael Foote
- 01 Jan 1994
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About: The article was published on 01 Jan 1994. and is currently open access. The article focuses on the topics: Devonian & Ordovician.
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Citations
The evolution of morphological diversity
TL;DR: Quantitative morphological studies reveal profound changes in evolutionary rates corresponding with the generation of morphological disparity at low taxonomic diversity during the early radiation of many clades.
Morphological disparity in Ordovician-Devonian crinoids and the early saturation of morphological space
TL;DR: Comparison with generic richness reveals that the full range of form was essentially attained by the early part of the Caradocian, long before the time of maximal taxonomic diversity.
236
Dynamics of clade diversification on the morphological hypercube
TL;DR: It is shown that the observed patterns of deceleration in clade diversification can be explicable in terms of the geometric structure of the morphospace and the effects of extinction and speciation on morphological disparity without invoking major declines in the size of morphological transitions or taxonomic turnover rates.
Assessing the robustness of disparity estimates: the impact of morphometric scheme, temporal scale, and taxonomic level in spatangoid echinoids
TL;DR: Disparity patterns are similar at both the genus and species levels, and the relative robustness of these patterns implies that the choice of temporal scale, morphometric scheme, and taxonomic level may not affect broad trends in disparity and the representation of large-scale morphospace structure.
Faunal invasions as a source of morphological constraints and innovations? The diversification of the early Cardioceratidae (Ammonoidea; Middle Jurassic)
TL;DR: It is demonstrated here that geographical constraints play a significant role in the expression of innovation and may be seen as a major factor in macroevolutionary dynamics.
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