E) tunicate adults have all four chordate characteristics. Explanation: Tunicates are nonvertebrate chordates whose larvae have the four characteristics that define chordates. They have a notochord, a dorsally located nerve cord, pharyngeal pouches, and a postanal tail.
Which of the following are categorised under chordata?
Chordates are divided into three subphyla: Vertebrata (fish, amphibians, reptiles, birds, and mammals); Tunicata or Urochordata (sea squirts, salps); and Cephalochordata (which includes lancelets).
Which of the following chordate characteristics is found in adult tunicate?
Adult tunicates are sessile and only retain pharyngeal slits and lack a notochord, a dorsal hollow nerve cord, and a post-anal tail.
Which of the following is not a distinctive character of non chordate?
Absence of post-anal tail.
Which of the following is not a feature that all chordates share?
Notochord, pharyngeal gill slits and post anal tail is absent in non-chordate animals. In non-chordates, the central nervous system is ventral, solid and double. 2.
Which of these characteristics is only found in chordates?
Characteristics of Chordata. Animals in the phylum Chordata share four key features: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
Which part of the body is considered as a notochord in hemichordates?
So, the answer is ‘proboscis’.
Which phylum are non chordates?
Members of phylum Porifera, Coelenterata, Ctenophora, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata and Hemichordata fall under Non-chordates. The general characteristic features of Non-Chordates are: They are cylindrical, triploblastic, coelomate, or pseudocoelomate animals.
Which phylum is considered as connecting link between non chordates and chordates?
It is a deuterostome possessing branchial openings and showing affinity to various groups of organisms. However the Balanoglossus is considered an important connecting link between chordates and non-chordates (vertebrates and invertebrates) So, the correct answer is “Balanoglossus”.
Which phylum is evolutionary link between echinoderms and chordates?
Why are hemichordates thought to be an evolutionary link between echinoderms and chordates? They share characteristics with both echinoderms and chordates. Their adult morphology resembles that of a chordate, while many traits in their larva resemble echinoderms.
Why hemichordates are not true chordates?
Hemichordates do not have a notochord so they are placed under separate phylum under non-chordates.
Why all chordates are not considered as vertebrates justify?
Answer: Notochord is a characteristic feature of all chordates. The members of sub-phylum – Vertebrata possess notochord during the embryonic stage. … Thus, the absence of notochord in adult vertebrates suggest that all vertebrates are chordates but all chordates are not vertebrates.
Why all chordates are not vertebrates?
The members of Vertebrata possess notochord during embryonic development. Thus, all vertebrates are chordates. However, the notochord gets replaced by a cartilaginous or bony vertebral column in the adult. Thus, all chordates are not vertebrates.
Why all vertebrates can be called as chordates but all chordates cannot be called as vertebrates?
Chordates include Urochordates, Cephalochordates (both are called protochordates) and vertebrates. In vertebrates notochord is replaced by vertebral column (backbone), however vertebral column is not present in protochordates. Therefore, all vertebrates are chordates but all chordates are not vertebrates.
Why are chordates considered deuterostomes?
All chordates are deuterostomes possessing a notochord. … 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.
Why are echinoderms and chordates grouped together?
Echinoderms and chordates are grouped together because they both are deuterostomes, or animals that grow radially, have a blastopore that develops…
Why are echinoderms consider closer to chordates than any other phylum?
Echinoderms are considered closer to chordates than to any other phylum because the coelom of the animals in this phylum is made from the digestive tube and the endoskeleton is made of 95% of calcium carbonate just like in chordates.
Why are echinoderms considered more closely related to chordates than other invertebrates?
Echinoderms are closer to Chordates than any other phylum: During embryonic development, the first aperture that is formed in deuterostomes is a primitive anus. Alternatively, in protostomes the first aperture, also known as a blastopore, develops to form the mouth.