Reappraisal of ambulacral branching patterns in blastozoans. - Archive ouverte HAL Access content directly
Conference Papers Year : 2010

Reappraisal of ambulacral branching patterns in blastozoans.


The type of ambulacral bifurcation is an important diagnostic character in primitive echinoderms. However this character is rarely used in blastozoan phylogenetic studies, whereas the corresponding character is well used in crinoid analyses. The main reason for this gap is the absence of definition of patterns for all blastozoans, resulting in terminological confusion. Although crinoid arms and blastozoan ambulacra are not homologous, the well-defined crinoid terminology has been used to describe the different topologies of ambulacral bifurcation. Unilateral and bilateral patterns have been recognized in blastozoans, and associated with the mineralization of the ambulacra. Four morphoclines are proposed to interpret the morphological relationships between the different patterns.


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hal-00438811 , version 1 (04-12-2009)


  • HAL Id : hal-00438811 , version 1


Elise Nardin, Bruno David, Bertrand Lefebvre, Rich Mooi. Reappraisal of ambulacral branching patterns in blastozoans.. 12th International Echinoderm Conference, Aug 2006, Durham, United States. pp.45-50. ⟨hal-00438811⟩
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