How do deuterostomes develop?ĭuring development the mouth of deuterostomes develops from an opening into the embryonic gut other than the blastopore, which develops into the anus. The highly modified nervous system of echinoderms obscures much about their ancestry, but several facts suggest that all present deuterostomes evolved from a common ancestor that had pharyngeal gill slits, a hollow nerve cord, circular and longitudinal muscles and a segmented body. (Indeed, some echinoderm- like fossil forms possess gill slits.) How did deuterostome evolve? The deuterostome ancestor most likely had gill slits, which, though preserved in chordates and hemichordates, were lost in the echinoderm line. What is a common ancestor of all deuterostomes? … Their archenteron development occurs during the initials stage of embryo creation. Their coelom is developed from the longitudinal pouches of the archenteron. In protostomes, a mouth develops from the blastopore. In deuterostomes, an anus develops from the blastopore. What is the characteristics of deuterostomes?.Which of the following is not a deuterostome?.What body part develops from the ectoderm?.What are the three developmental stages which distinguish protostomes and deuterostomes?.Do deuterostomes have a central nervous system?.When did protostomes and deuterostomes diverge?.What is the order of Protostome development?.
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