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The Cambrian chordates are an extinct group of animals belonging to the phylum Chordata that lived during the Cambrian, between 538 and 485 million years ago. The first Cambrian chordate known is Pikaia gracilens, a lancelet -like animal from the Burgess Shale in British Columbia, Canada.
3 min read. The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known. The Cambrian Explosion saw an incredible diversity of life emerge, including...
Chordata, Ambulacraria, and possibly Xenacoelomorpha are believed to form the superphylum Deuterostomia, although this has recently been called into doubt. Chordate fossils have been found from as early as the Cambrian explosion, 539 million years ago.
Apr 22, 2015 · As a whole, all these presumed chordates from the Cambrian, mostly preserved as soft-tissue imprints, only provide tenuous information about their possible phylogenetic relationships.
- Philippe Janvier
- janvier@mnhn.fr
- 2015
May 27, 2016 · Among the animals that evolved during this period were the chordates — animals with a dorsal nerve cord; hard-bodied brachiopods, which resembled clams; and arthropods — ancestors of spiders,...
- Mary Bagley
Oct 28, 2012 · The Cambrian Period may be divided into three divisions: Lower (Early), Middle, and Furongian (Late). As noted above, trilobites are the most common fossil types, and these dominant animals of the Cambrian seas characterize this Period. Each division of the Cambrian is identified with particular trilobite genera.
The characteristic features of Chordata are a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. Chordata contains two clades of invertebrates: Urochordata (tunicates) and Cephalochordata (lancelets), together with the vertebrates in Vertebrata.
