. Comparative anatomy. Anatomy, Comparative. 1 1 4 ;| |i -r: ; 4 m â r : n m r;: H SH - z. ⢠E 3l : -T â H s :r: :ii m :-- Ik J r COELENTERATE FLATWORM. BLASTULAE Fig. 520.âA 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 flatworms can be said to be ancestral to chordates. (Redrawn after H. E. Zi
. Comparative anatomy. Anatomy, Comparative. 1 1 4 ;| |i -r: ; 4 m â r : n m r;: H SH - z. ⢠E 3l : -T â H s :r: :ii m :-- Ik J r COELENTERATE FLATWORM. BLASTULAE Fig. 520.âA 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 flatworms can be said to be ancestral to chordates. (Redrawn after H. E. Ziegler.) possessed. Since, then, a group treated as ancestral may resemble an ancestor in one respect, but depart widely from the ancestral condition in others, the conventional family tree may be misleading, unless it is. 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
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