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The vertebrates exhibit two major innovations in their evolution from the invertebrate chordates. These innovations may be associated with the whole genome duplications that resulted in a quadruplication of the basic chordate genome, including the Hox gene loci that regulate the placement of structures along the three axes of the body. One of the first major steps was the emergence of the ...
Super-embr. Les Craniata ( craniés ou craniates en français) sont un clade des chordés possédant un crâne cartilagineux ou osseux protégeant la partie antérieure du système nerveux. Ce groupe est censé regrouper les myxines et les vertébrés, et être le groupe frère des tuniciers parmi les olfactoriens. Cependant, des études ont ...
Chordate - Evolution, Paleontology, Anatomy: Chordates may have originated earlier than 590 million years ago and predate the fossil record. Hemichordates are probably the closest relatives of chordates. Phylum Chordata has three subphyla: Tunicata (Urochordata or tunicates); Cephalochordata (Acrania or lancelets); and Vertebrata (Craniata or vertebrates).
Category. : Chordates. Wikimedia Commons has media related to Chordata. This category consists all articles on taxa at the subphyla and class levels in the Chordata phylum.
The chordates are named for the notochord, which is a flexible, rod-shaped structure that is found in the embryonic stage of all chordates and in the adult stage of some chordate species. It is located between the digestive tube and the nerve cord, and provides skeletal support through the length of the body.
Chordates, members o the phylum Chordata, are deuterostome ainimals possessin a notochord, a hollae dorsal nerve cord, pharyngeal slits, an endostyle, an a post-anal tail for at least some period o thair life cycles. Taxonomically, the phylum includes the subphyla Vertebrata, includin mammals, fish, amphibians, reptiles, birds; Tunicata ...
Cordate. Chordata este o încrengătură de animale ce posedă coardă dorsală. Încrengătura include acraniatele, ciclostomatele, peștii, amfibienii, reptilele, păsările și mamiferele . Deși sunt foarte diverse, cordatele posedă caracteristici comune. Toate cordatele au schelet axial, intern.
