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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.
A chordate ( / ˈkɔːrdeɪt / KOR-dayt) is a deuterostomic animal belonging to the phylum Chordata ( / kɔːrˈdeɪtə / kor-DAY-tə ). All chordates possess, at some point during their larval or adult stages, five distinctive physical characteristics ( synapomorphies) that distinguish them from other taxa.
This chapter provides a very broad and generalized overview of the diversity and evolutionary history of Chordata, which originated during the Cambrian period alongside most of the other animal phyla. Let's begin here with consideration of basal chordates, which are represented by a great diversity of forms, many of which most people would ...
Chordates consist of three distinct animal groups: cephalochordates, urochordates (tunicates) and vertebrates. This review starts with a brief description of how the Phylum Chordata and its three subphyla were originally defined, and then discusses how we should reclassify the major chordate groups. 2.
- Noriyuki Satoh, Daniel Rokhsar, Teruaki Nishikawa
- 2014
11 août 2019 · Two bilaterian groups, the chordates and the vetulicolians, are of particular interest for understanding early deuterostome evolution, and the main objective of this review is to examine the Cambrian diversity of these two deuterostome groups.
- McMenamin
- 2019
6 juil. 2023 · 2 Citations. 471 Altmetric. Metrics. Abstract. Tunicates are an evolutionarily significant subphylum of marine chordates, with their phylogenetic position as the sister-group to Vertebrata making...
1 janv. 2024 · Chordates are the group of animals to which vertebrates including humans belong. Like so many other phyla of bilaterian animals, they originated in the ocean over 520 million years ago, before or during the Cambrian period.
