Diploblastic Metazoans: Porifera and Archaeocyatheans

  • Raymond Enay


These two groups have frequently been considered together in the same phylum as simple forms of metazoans. The affinities and taxonomic position of the exclusively fossil archaeocyatheans has long been discussed. However, sponges and archaeocyatheans are now interpreted as two separate metazoan phyla which originated directly but independently from protozoan ancestors. The receptaculids, another enigmatic group, is placed close to these two groups, albeit in a still rather uncertain position.


Lower Cambrian Skeletal Element Calcareous Sponge Calcareous Skeleton Sponge Reef 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1993

Authors and Affiliations

  • Raymond Enay
    • 1
  1. 1.Université Claude Bernard-Lyon 1Villeurbanne CedexFrance

Personalised recommendations