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原文連結
論文資訊
- 類型：已發表論文
- 日期：2000
摘要
Temporal asymmetries in clade histories have often been studied in lower Paleozoic radiations. Post-Paleozoic patterns, however, are less well understood. In this paper, disparity and 多樣性 changes in Mesozoic heart urchins were analyzed at the ordinal level, with contrasts among the sister groups Holasteroida and Spatangoida, their paraphyletic stem group Disasteroida, and the more inclusive clade, the superorder Atelostomata. A 38-dimensional landmark-based morphospace representing test architecture was used to describe morphological 演化 in terms of total variance and total range. Discordances between disparity and 多樣性 were evident and were expressed both as deceleration in morphological diversification in all groups and as disproportionately higher disparity early in the histories of the A
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