Echinoderms have evolved diverse and disparate morphologies throughout the
Phanerozoic. Among them, blastozoans, an extinct group of echinoderms that were an …

Abstract The Ordovician of Scandinavia (ie Denmark, Norway and Sweden) has been
investigated for over two centuries and, through time, various chronostratigraphic schemes …

This review illustrates the most important features of the Ordovician successions of the
Sardinian basement. We focus on the stratigraphy and tectonic structures in the tectonic …

The extensive, predominantly siliciclastic deposits of the Upper Ordovician of the Tafilalt
have long been the subject of scientific investigation. In the past 25 years, intensified …

Echinoderms make up a substantial component of Ordovician marine invertebrates, yet their
speciation and dispersal history as inferred within a rigorous phylogenetic and statistical …

This study documents previously unknown taxonomic and morphological diversity among
early Palaeozoic crinoids. Based on highly complete, well preserved crown material, we …

Cornute stylophorans are a minor, although typical, component of Middle–Late Ordovician
echinoderm assemblages adapted to soft siliciclastic substrates in high-latitude peri …

Abstract The Anti-Atlas contains a thick, volcanic-free Ordovician succession that originally
deposited in a passive-margin basin. Three main sedimentary packages are bounded by …

The extraxial-axial theory (EAT) and universal elemental homology (UEH) are often
portrayed as mutually exclusive hypotheses of homology within pentaradiate …

The phylogenetic relationships of Paleozoic blastozoan echinoderms are poorly understood
and many of the traditionally ascribed groups are likely polyphyletic. Diploporitans, those …