. Animal biology. Zoology; Biology. 576 GENERAL CONSIDERATIONS Verfebrata Cephalochorda ia Arfhropoda Annelio/of Chaefogna^ha. Urochordata Mollusca Echinodermafa (Secondary Raa/ial) Brachiopoda Bryozoa True Coelom Nemer-ti'neoi (CoelomFJ Nemafhelmin fhes (Body Cavity) Plafyhelmin fhes Cfenophora (Biradial) Rofifera (Body Cavii-y) Alimentary Canal Bilateral Symmetry Triploblastic Coelenterata {Radial) _pi2lob/astic Porifera (Radial) First Life Fig. 394.—Diagram of a phylogenetic tree illustrating one conception of the relation- ship of the animal phyla, and also suggesting the uncertainty atten
. Animal biology. Zoology; Biology. 576 GENERAL CONSIDERATIONS Verfebrata Cephalochorda ia Arfhropoda Annelio/of Chaefogna^ha. Urochordata Mollusca Echinodermafa (Secondary Raa/ial) Brachiopoda Bryozoa True Coelom Nemer-ti'neoi (CoelomFJ Nemafhelmin fhes (Body Cavity) Plafyhelmin fhes Cfenophora (Biradial) Rofifera (Body Cavii-y) Alimentary Canal Bilateral Symmetry Triploblastic Coelenterata {Radial) _pi2lob/astic Porifera (Radial) First Life Fig. 394.—Diagram of a phylogenetic tree illustrating one conception of the relation- ship of the animal phyla, and also suggesting the uncertainty attending the relationship of most of the different phyla above the Coelenterata. Levels of organization are indicated by horizontal lines of dashes. Retrogression is suggested by the branch turning downward. Enteropneusta is a class of Hemichordata which includes 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 Wolcott, Robert Henry, 1868-1934; University of Nebraska (Lincoln campus). Dept. of Zoology. New York ; London : McGraw-Hill Book Company, Inc.
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