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19 juin 2024 · Chordate, any member of the phylum Chordata, which includes the vertebrates, the most highly evolved animals, as well as two other subphyla—the tunicates and cephalochordates. Some classifications also include the phylum Hemichordata with the chordates.
- Internal Features
Chordate - Nervous System, Notochord, Muscular System: All...
- Evolution and Paleontology
Chordate - Evolution, Paleontology, Anatomy: Chordates may...
- Protochordate
protochordate, any member of either of two invertebrate...
- Hemichordata
hemichordate, any of a group of wormlike marine...
- Cephalochordate
cephalochordate, any of more than two dozen species...
- Internal Features
29 juin 2024 · Presently, around 81,000 extant chordate species are divided into three subphyla: cephalochordates (Cephalochordata), tunicates (Tunicata), and vertebrates or craniates (Vertebrata). Characteristics. Chordates possess five characteristics that distinguish them from other animal phyla.
11 juin 2024 · We resolve vetulicolians as a paraphyletic group comprising the earliest diverging stem chordates, subtending a grade of more derived stem-group chordates comprising Yunnanozoon and Pikaia. Our phylogenetic results reveal the stepwise acquisition of characters diagnostic of the chordate crown group.
19 juin 2024 · 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 ...
Il y a 5 jours · Ascidians (Phylum: Chordata, Class: Ascidiacea), or sea squirts, are the largest and most diverse class of the sub-phylum Tunicata (also known as Urochordata). They comprise approximately 3000 described species found in all marine habitats from shallow water to the deep sea.
Il y a 2 jours · fish, any of approximately 34,000 species of vertebrate animals (phylum Chordata) found in the fresh and salt waters of the world. Living species range from the primitive jawless lampreys and hagfishes through the cartilaginous sharks, skates, and rays to the abundant and diverse bony fishes.
18 juin 2024 · Chordates are divided into three subphyla: Cephalochordata (lancelets), Urochordata (tunicates), and Vertebrata; Lancelets are the most basal chordates and possess all four defining chordate characteristics throughout their lives
