Fig. 3.

Ecological, morphological (33), and generic (19, 42) diversification history of crinoids and evolutionary history of relevant echinoids during geologic periods of the post-Paleozoic. Note that ecology and morphology peak in the Triassic (Tr E, Early Triassic; Tr M, Middle Triassic; Tr L, Late Triassic), whereas generic diversity peaks in the Jurassic. Crinoid coding: §Sessile as adults; *Capable of benthic locomotion; #Nektonic, planktonic, or pseudoplanktonic. Inferred relationships modified after published reports (27, 28, 31, 36).