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. Hemichordates thus very remotely connected with the central stock from which true chordates descended. A chordate (/ ˈ k ɔːr d eɪ t /) is an animal of the phylum Chordata (/ k ɔːr ˈ d eɪ t ə /).During some period of their life cycle, chordates possess a notochord, a dorsal nerve cord, pharyngeal slits, and a post-anal tail: these four anatomical features define this phylum.Chordates are also bilaterally symmetric, and have a coelom, metameric segmentation, and circulatory system. It is located between the digestive tube and the nerve cord, and … evidence that links hemichordates and chordates to the same evolutionary lineage share deuterostome characteristics : pharyngeal slits dorsal tubular nerve chord complete digestive tract evidence of chordate affinities in adult tunicates In 1816, Lamarck and … But these can be overlooked in favour of the more chordate-like characteristics of cephalochordates. Chordates. If the life history of such animal is studied, the larval form reveals the chordate chara’4ters of that animal. Urochordate Origin. Types of scales and fins of fishes, Scoliodon as type study, migration and parental care in fishes. Features indicate Hemichordates are definition lower in rank than true Chordates ( Uro- & Cephalo-chordates). Indeed, most of the animals on exhibit at any zoo are chordates. However, modern workers do not support the contention and they hold that the echinoderms and the chordates diverged separately from a common basic ancestor. affinities of urochordates If the life history of such animal is studied, the larval form reveals the chordate characters of that animal. Cephalochordates have been regarded to be phylogenetically related to several non-chordate groups at one time or other. The most convincing affinities are noted between the echinoderms and the chordates. Affinities with chordata: Bateson (1887) included hemichordata in phylum chordata, since then a close relationship has been acknowledge between hemichordates and chordates Resemblances: The Phylogenetic relationship of hemiichordates and cohordates is based on the supposed presence of the three fundamental chordate Study of Petromyzon and its affinities. Chordate Affinities: Hence many workers regarded the echinoderms to be the nearest group to the chordates. Tornaria larva of hemichordates shows phylogenetic relationship with echinoderm larvae and hemichordates also show affinities with chordates. The phylum Chordata includes many familiar animals. The typical tunicate looks like a non-chordate animal. The vast majority of the chordates have a well-organized internal skeleton system made up … Affinities of Urochordates . Different affinities and systematic position of balanoglossus are given below: (1) Affinities with chordate: Earlier Zoologists like William Bateson (1885) proposed close affinities with chordates on the basis of three fundamental characters: ADVERTISEMENTS: (a) A notochord (b) A dorsal hollow nerve cord and (c) Pharyngeal gill slits On the basis of these similarities hemichordates have […] Affinities of Branchiostoma: Branchiostoma show affinities with non-chordate as well as chordates. 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