The hexamer hypothesis explains apparent irregularities in the plating of early and extant crinoids
de Lussanet de la Sablonière, MHE
Research article (book contribution) | Peer reviewedAbstract
In 2011 I proposed a new hypothesis for the evolution and development of the five-rayed structure of echinoderms, the Hexamer Hypothesis (Lussanet, 2011). According to this hypothesis, the five-rayed structure develops by reduction from a six-rayed Bauplan. Crinoids (sea lilies) are unique as the only extant clade with stalked representatives, reaching back at least to the early Ordovician. Their extraordinary rich fossil record and the known embryology of recent forms make them ideal to test the Hexamer Hypothesis. It is concluded that the plating of the calyx and the stalk can be explained by the new hypothesis.
Details about the publication
Editors: Zamora S, Rábano, I.
Book title: Progress in Echinoderm Palaeobiology, Spain
Page range: 49-52
Publisher: Selbstverlag / Eigenverlag
Place of publication: Madrid
Status: Published
Release year: 2015
Language in which the publication is written: English
Keywords: Early crinoids; fossil; embryology; Bauplan; evolution; Extraxial axial theory (EAT); hexamer hypothesis
Authors from the University of Münster
| de Lussanet de la Sablonière, Marc |
Projects the publication originates from
Evolution, Development and Anatomy of Echinoderms (EchinodermHexamery) Duration: since 20/01/2007 Type of project: Own resources project |