. Chordate anatomy. Chordata; Anatomy, Comparative. COELENTERATE FLATWORM. BLASTULAE Fig. 374.—A diagram showing hypothetical stages in the ancestry of sponges, coelenterates, flatworms and chordates. Such a series is evidently based chiefly upon embryological evidence. If the diagram represents correctly the early phases of phylogenesis, chordates have split off from other phyla earlier than morphologists generally have assumed and not even coelenterates or flatworms can be said to be ancestral to chordates. (Redrawn after H. E. Ziegler.) ancestors of chordates. Consequently the phylogenesis
. Chordate anatomy. Chordata; Anatomy, Comparative. COELENTERATE FLATWORM. BLASTULAE Fig. 374.—A diagram showing hypothetical stages in the ancestry of sponges, coelenterates, flatworms and chordates. Such a series is evidently based chiefly upon embryological evidence. If the diagram represents correctly the early phases of phylogenesis, chordates have split off from other phyla earlier than morphologists generally have assumed and not even coelenterates or flatworms can be said to be ancestral to chordates. (Redrawn after H. E. Ziegler.) ancestors of chordates. Consequently the phylogenesis of each organ system must be worked out more or less independently of other organs. To believe that the different phyla have acquired their systems of organs. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son & Co.
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