Their body temperature changes according to the external environment. The anterior end of the animal will project anteriorly as snout. The gill slits are numerous and persist in the adults. Vertebrata. The cephalochordates are the closest living relatives of the vertebrates. Phylum Chordata Notes mgitterm. Phylum Chordata khannea21. Protochordate, any member of either of two invertebrate subphyla of the phylum Chordata: the Tunicata (sea squirts, salps, etc.) The brain, even in the larva, is composed of three parts (forebrain, midbrain and hindbrain). Excretion occurs by solenocytes. Deuterostomes (like the echinoderms) 2. Alimentary canal is U-shaped so that the anus lies close to the mouth. ... Phylum Chordata (PowerPoint Presentation) Vaibhav Patel. Cyclostomata is a group of agnathans that comprises the living jawless fishes: the lampreys and hagfishes.Both groups have jawless mouths with horny epidermal structures that function as teeth, and branchial arches that are internally positioned instead of external as in jawed fishes. and the Cephalochordata (amphioxus). Cephalochordata 3. 3. Most of its body is burned. The notochord extends up to the cephalic or head region and persists throughout the life. On the collar is a pair of hollow branching arms having cilia which collect the food of the animal. Urochordata (tunicates) 2. 12 Chordata Geonyzl Alviola. We can classify animals based on the type of development they undergo. The name Cyclostomata means "round mouths". Phylum Chordata Christina Drumm. Subphylum Cephalochordata Urochordata 12. Cephalochordata. This spindle shaped body is useful for burrowing and swimming. Fell (1963) & others believe that their larval similarities are only because of convergent evolution due to same mode of habits & habitats. filum chordata Tri Licia. [If a cold blooded animal is taken to the equator its body temperature increases and if taken to the poles its body temperature decreases] They can survive in a wide of environments as they are able to regulate their body temperature. Cephalochordata: They are also marine and filter-feeders. 3. Only its anterior part is left outside. It is pointed at both ends. All share four features: • Notochord supports body • Nervous system develops from dorsal nerve cord • Embryos have pharynx with slits • Embryos have tail that extends past anus Three Subphyla Two invertebrate subphyla 1. The notochord is stiff & flexible rod lying ventral to nerve Are triploblastic Are coelomate Are bilaterally symmetrical Have post anal tail Closed circulatory system Have dorsal hollow nerve cord Paired pharyngeal gill slits 3 sub phylum: 1. Like the remaining subphylum of the chordates, the Vertebrata, the protochordates have a hollow dorsal nerve cord, gill slits, and a Urochordata or Tunicata 2. After 3-7 years the larva metamorphoses into a juvenile and migrates to the sea or in freshwater species to lakes to take up its parasitic existence.