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A chordate (/ ˈ k ɔːr d eɪ t / KOR-dayt) is a deuterostomal bilaterian animal belonging to the phylum Chordata (/ k ɔːr ˈ d eɪ t ə / 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 .
Haikouichthys ercaicunensis looks like Myllokunmingia with which it was discovered from the same beds. The body about 2.5 cm (1 in) long and is narrower than Myllokunmingia. The head and tail are distinct at the opposite ends. There are at least six to nine probable gills. The myomeres are with rear directed chevrons in the tail.
Pikaia gracilens is an extinct, primitive chordate marine animal known from the Middle Cambrian Burgess Shale of British Columbia.Described in 1911 by Charles Doolittle Walcott as an annelid, and in 1979 by Harry B. Whittington and Simon Conway Morris as a chordate, it became "the most famous early chordate fossil", [1] or "famously known as the earliest described Cambrian chordate". [2]
Media in category "Chordate images" The following 15 files are in this category, out of 15 total. Ameiva leucostigma.jpg 510 × 317; 33 KB.
The dorsal nerve cord is an anatomical feature found in chordate animals, mainly in the subphyla Vertebrata and Cephalochordata, as well as in some hemichordates.It is one of the five embryonic features unique to all chordates, the other four being a notochord, a post-anal tail, an endostyle, and pharyngeal slits.
Like all other chordates, tunicates have a notochord during their early development, but it is lost by the time they have completed their metamorphosis. As members of the Chordata, they are true Coelomata with endoderm , ectoderm , and mesoderm , but they do not develop very clear coelomic body cavities, if any at all.
Chordate stubs (2 C, 10 P) Pages in category "Chordates" The following 5 pages are in this category, out of 5 total. This list may not reflect recent changes. ...
Myllokunmingia is a genus of basal chordate from the Lower Cambrian Maotianshan shales of China 518 mya and is thought to be a vertebrate, [2] although this is not conclusively proven. [3] The type species M. fengjiaoa is 28 mm long and 6 mm high. It is among the oldest possible craniates, found in the lower Cambrian Chengjiang).