author={Stephen M Rowland},
  booktitle={Journal of Paleontology},
  • S. Rowland
  • Published in Journal of Paleontology 1 November 2001
  • Geography
Abstract Archaeocyaths are calcareous, conical, Cambrian fossils with a long history of phylogenetic uncertainty and changing interpretations. The history of phylogenetic interpretation of archaeocyaths reveals five distinct schools of thought: the coelenterate school, the sponge school, the algae school, the Phylum Archaeocyatha school, and the Kingdom Archaeata school. Late nineteenth century and early twentieth century paleontologists worked within a paradigm of inexorably increasing… 
Prey fractionation in the Archaeocyatha and its implication for the ecology of the first animal reef systems
A new method to estimate the limit on the upper size of plankton that could be consumed by an archaeocyath during life is outlined, showing that during the establishment of the first animal reef systems, prey partitioning was established as a way of reducing competition.
Poriferan paraphyly and its implications for Precambrian palaeobiology
It is demonstrated, in accordance with previous molecular studies, that sponges are paraphyletic, and that calcisponge are more closely related to eumetazoans than they are to demosponges.
Restricted morphospace occupancy of early Cambrian reef-building archaeocyaths
Abstract. The evolution of novel morphologies can signify expansion of a clade into new niches. This can be studied in the fossil record by investigating the morphospace occupancy of organisms,
The Ediacaran Biotas in Space and Time1
  • B. Waggoner
  • Environmental Science, Geography
    Integrative and comparative biology
  • 2003
It is concluded that the Ediacaran organisms show a diverse range of responses to various environmental parameters, and there is no basis for classifying them all as having a single body plan and mode of life.
Palaeontology of sponges - : a review
The majority of palaeontologic studies are concerned with taxonomic aspects of fossil sponge faunas, but investigations of the microstructure of the calcareous skeleton, of phylogeny (especially of the early forms), and of various aspects of their ecology have produced important results.
1 Prey fractionation in the Archaeocyatha and its implication for the ecology of the first animal 1 reef systems 2 3 Running title : Prey fractionation in Archaeocyaths 4 5
20 Archaeocyaths are the most abundant sponges from the Cambrian period, forming the first animal 21 reef communities over 500 million years ago. The Archaeocyatha are index fossils for correlating
Cyathophycus and the origin of demosponges
The evolutionary link between the classes is suggested to lie within the dictyospongioid and hazeliid lineages, and it is conceptually much easier to derive the demosponges from the hexactinellids, rather than vice versa.
Following the logic behind biological interpretations of the Ediacaran biotas
Abstract For almost 150 years, megascopic structures in siliciclastic sequences of terminal Precambrian age have been frustratingly difficult to characterize and classify. As with all other areas of
Photosymbiosis in Past and Present Reefs
The hypothesis that photosymbiosis best explains both the successes and failures of reefs through geologic time is developed and evidence is reviewed that suggests photosyMBiosis in reef organisms played significant roles throughGeologic time in both the evolution and extinction of organisms and the reefs they constructed.


Evolution of archaeocyaths and palaeobiogeography of the Early Cambrian
  • A. Zhuravlev
  • Geography, Environmental Science
    Geological Magazine
  • 1986
Abstract In the Early Cambrian, there were two peaks of the increase in number of new archaeocyathan genera. These diversification bursts are, perhaps, related to significant changes in Early
Functional analysis of archaeocyathan skeletal morphology and its paleobiological implications
Differences in flow pattern between the porous- and aporous-septate models suggest a hitherto unknown function for septa, which may be a mechanism by which outer-wall leakage is avoided later in life.
Fossil and Recent Sponges
Aspects of Sponge Biology and Morphometric and Biochemical Differences Between Sympatric Populations of the Clathria "Spicata" Species Complex (Demospongiae: Poecilosclerida: Microcionidae) from Northern Australia are reviewed.
The Early Evolution of Metazoa and the Significance of Problematic Taxa
The Origin of metazoans: a phylogeny deducted from sequences of the 28S ribosomal RNA and problems of arthropod phylogeny with some notes on taxa of doubtful affinities, and a new approach to analyzing problematica.
A kinetic model of Phanerozoic taxonomic diversity II. Early Phanerozoic families and multiple equilibria
The kinetic model of taxonomic diversity predicts that the long-term diversification of taxa within any large and essentially closed ecological system should approximate a logistic process controlled
Diversification of Archaeocyatha
Archaeocyaths are an extinct group of sessile marine organisms that lived on carbonate shelves in reef environments during the Cambrian. The basic skeleton is composed of a calcareous cup made up of
Dasyclads, cyclocrinitids and receptaculitids: comparative morphology and paleoecology
  • S. Beadle
  • Geography, Environmental Science
  • 1988
The cyclocrinitids are an extinct tribe of dasycladacean green algae. They were anatomically very similar to certain Recent dasyclads, even at early growth stages. The morphology and preservation of
The ecology of the Cambrian radiation
AcknowledgmentsIntroduction, by Andrey Yu. Zhuravlev and Robert RidingI. The Environment2. Paleomagnetically and Tectonically Based Global Maps for Vendian to Mid-Ordovician Time, by Alan G. Smith3.
Functional biology and ecology of Archaeocyatha
The Archaeocyatha, an early Cambrain group of calcified sponges, were the first skeletal metazoans to develop a modular habit and to be associated with reefs, and show the predicted ecological changes with the appearance of modularity.
On Archæocyathus, Billings, and on other Genera, allied to or associated with it, from the Cambrian Strata of North America, Spain, Sardinia, and Scotland
  • G. J. Hinde
  • Geology
    Quarterly Journal of the Geological Society of London
  • 1889
The real characters and the relations of the group of fossils known generally under the term Archæocyathus are at present subjects of discussion among palæontologist; they have been regarded as