The phylum Chordata consists of three subphyla: Urochordata, represented by tunicates; Cephalochordata, represented by lancelets; and Craniata, which includes Vertebrata. Body is covered with a cuticular tunic or test. Urochordata: Urochordata refers to a group of chordates comprising of tunicates. Difference between Shark and Ray PreserveArticles.com is an online article publishing site that helps you to submit your knowledge so that it may be preserved for eternity. Characteristics of Phylum Chordata Classification of Chordata: 3 Groups Linking to Vertebrates and Invertebrates: There are 3 groups of taxons that link vertebrates to invertebrates. Urochordata 1. Chordata is anything with a spine (backbone). Position of the Notochord. Correct answers are- 1- d 2-c 3-b 4-c 5-a 6-b 7-b 8-b 9-a 10-b 11-c 12-c 13-b 14-a 15-b tail region hence named. Nerve chord is dorsal and tubular. In Urochordata,the notochord, nerve cord, and postanal tail is only found in the larval stage. Following are the substantial key differences between the two: In Chordates the respiration is through gills or lungs and in Non-chordates it is through a body surface, gills, or tracheae . The Urochordata (== Tunicata) are a group of organisms commonly called the sea squirts (in English) or tunicates. The main difference between chordates and vertebrates is that some chordates do not have a vertebral column whereas all vertebrates have a vertebral column. 5. If I had to take a wild guess, craniata sounds like cranium which is skull. Or maybe it's anything with a brain? Protochordates are a group of animals which have a backbone like structure at the young ages which is later replaced by muscles. In Urochordata,the notochord, nerve cord, and postanal tail is only found in the larval stage. So they don't have these chordate characteristics as adults. What is the differences between Hemichordata and Urochordata? Animal belonging to cephalochordata show notochord extended in head region too hence named. The key difference between vertebrates and chordates is that the vertebrates are a major subphylum of chordates that have a vertebral column while the chordates are highly evolved animals that possess a notochord, a dorsal nerve cord, pharyngeal slits, an endostyle, and … Difference between Hemichordata and Chordata December 22, 2017, Dr. Rae Osborn, Leave a comment Definition and Characteristics of Hemichordata The Hemichordata is a phylum of worm like invertebrate animals that are found in the ocean. So they don't have these chordate characteristics as adults. In vertebrates, the vertebral column surrounds and protects the nerve cord. The main difference between chordates and vertebrates is that some chordates do not have a vertebral column whereas all vertebrates have a vertebral column. 2. (Previously, when Both Sub phylum Cephalochordata and Urochordata belongs to phylum Chordata.They are also known as Protochordates, since they are considered primitive chordates as they do not show notochord as developed as in subphylum Vertebrata. Lancelets and Tunicates are marine organisms that belong to the phylum Chordata. - Urochordata and Cephalochordata are the closest relatives of Vertebrata - New molecular evidence shows that Urochordata is the sister group to Vertebrata - Cephalochordata is more closely related to the Echinoderms than to Vertebrates. Body is segmented. Pharynx is performed by … Différence principale - Urochordata vs Cephalochordata. Both chordates and vertebrates consist of a … All the articles you read in this site are contributed by users like you, with a single vision to liberate knowledge. The notochord, nerve cord, and postanal tail is only found in the larval stage.