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Is predation intensity reduced with increasing depth? Evidence from the west Atlantic stalked crinoid Endoxocrinus parrae (Gervais) and implications for the Mesozoic marine revolution
It is shown that there has been stronger predation on various invertebrates in shallow-wa- ter environments since the late Mesozoic marine revolution, and the stalked crinoids may have been unable to cope with increased predation in shelf environments, and they migrated to offshore environments. Expand
Fixed, free, and fixed: the fickle phylogeny of extant Crinoidea (Echinodermata) and their Permian-Triassic origin.
These analyses tend to support the hypothesis that the Crinoidea group is a radiation from a small clade that passed through the Permian-Triassic extinction event rather than several lineages that survived. Expand
Early Triassic recovery of echinoderms
Abstract The Permian–Triassic mass extinction interval was an important time in the evolutionary history of the echinoderms. Details of the extinction and, in particular the immediate post-extinctionExpand
Arm autotomy and arm branching pattern as anti-predatory adaptations in stalked and stalkless crinoids
The paradigmatic distribution of cryptosyzygies in which arm loss is set at a minimum, compared with the actual distribution, shows that these two patterns are similar and that actual specimens successfully reduce arm loss by the effective distribution of encryption, suggesting that the isocrinids have coped with increased predation. Expand
Fossil record of echinoderm regeneration with special regard to crinoids
  • T. Oji
  • Biology, Medicine
  • Microscopy research and technique
  • 15 December 2001
Fossil and recent stalked crinoids provide data on the degree and style of regeneration after loss of body parts and, if the aboral nerve center in the basal part of crown is retained, the entire calyx and arms can be regenerated. Expand
Deep‐Sea Communities
  • T. Oji
  • Geography
  • 13 December 2007
Larval stages of a living sea lily (stalked crinoid echinoderm)
It is suggested that a dipleurula-type larva is primitive for echinoderms and is the starting point for the evolution of additional larval forms within the phylum. Expand
Increase of shell-crushing predation recorded in fossil shell fragmentation
Revised data on the number of durophagous predator taxa (crustaceans and teleostean fishes) support this conclusion, and results of an experiment on shell abrasion indicate that incomplete bivalves and gastropods with angular margins from shallow-marine deposits can be considered as good evidence of d Kurophagrous predation. Expand
Retrograde community structure in the late Eocene of Antarctica
Current paleobiological models hold that predators eliminated populations of epifaunal suspension feeders from shallow, soft-substrate marine environments beginning in the Mesozoic. Among theExpand
A new Burgess Shale-type deposit from the Ediacaran of western Mongolia
SEM-EDS analysis shows that the fossils are composed of aluminosilicate clay minerals and some carbon, a composition comparable to fossils from the Cambrian Burgess Shale biota, which opens a new window through which to view late Precambrian life. Expand