A comprehensive division of animals including all Vertebrata together with the Tunicata, or all those having a dorsal nervous cord.
A major phylum in the Kingdom Animalia. A chordate is characterized by the presence of a dorsal notochord at some stage of development and a dorsal hollow nerve chord. The phylum includes the subphyla Vertebrata, Cephalochordata, and Urochordata.
a division of animals including all those that have a notochord during some stage of their development e.g. fish, amphibians, reptiles, mammals, birds and sea squirts
"a phylum of animals characterized by a hollow dorsal nerve cord and, at some stage in their development, a flexible skeletal rod (the notochord) and gill slits opening from the pharynx. There are four subphyla: the Urochordata (sea squirts), Cephachordata (lancelets), Agnatha (jawless chordates), and Gnathostomata (jawed chordates). In the Agnatha and Gnathostomata, commonly known as vertebrates or craniates, the notochord is present only in the embryo or larva and becomes replaced by the vertebral column (backbone) before birth or metamorphosis. This has permitted the vertebrates a greater degree of movement and subsequent improvement in the sense organs and enlargement of the brain, which is enclosed in a skeletal case, the cranium.
phylum (of which vertebrates are a subphylum) of animals containing, at some time in their life cycles, a notochord stiffening rod
comprises true vertebrates and animals having a notochord
The Phylum in which the Hummingbird is placed. It includes all animals that, in either embryonic or adult stages, have a notochord--a stiff rod that parallels the nerve chord. In vertebrates the notochord becomes the spinal column.
Chordates are animals that have a notochord and gill clefts at some point in their life. They have a hollow nerve cord that ends in a brain. Chordates include the vertebrates, cephalochordates (e.g. amphioxus), and urochordates (e.g. sea squirts).