. Chordate morphology. Morphology (Animals); Chordata. TABLE 15-3 THE PHYLOGENY OF THE VERTEBRATES ACCORDING TO JARVtK (1960) Dipnoi Urodela Anura \ .^ \ Labyrinthodont \ I Porolepi formes Osteolepiformes Sauropsida Therapsida Eiasmobranchii Placodermi Elasmobranchiomorphi. Coelacanthiformes * Branchiopter\'gii Actinopterygii GNATHOSTOMATA Cyclostomi Cephalaspidomorphi Pteraspidomorphi X Ostracodermi X . Eocraniata I Acrania AGNATHA Vertebrata Protochordata periodically to radiating sidelines; some of these became extinct and a few survived. An early branch gave rise to the brachiopterygian ty
. Chordate morphology. Morphology (Animals); Chordata. TABLE 15-3 THE PHYLOGENY OF THE VERTEBRATES ACCORDING TO JARVtK (1960) Dipnoi Urodela Anura \ .^ \ Labyrinthodont \ I Porolepi formes Osteolepiformes Sauropsida Therapsida Eiasmobranchii Placodermi Elasmobranchiomorphi. Coelacanthiformes * Branchiopter\'gii Actinopterygii GNATHOSTOMATA Cyclostomi Cephalaspidomorphi Pteraspidomorphi X Ostracodermi X . Eocraniata I Acrania AGNATHA Vertebrata Protochordata periodically to radiating sidelines; some of these became extinct and a few survived. An early branch gave rise to the brachiopterygian type, while later ones gave rise to the sturgeons and Lepisosteus. The living holosteans present a special problem. The dif- ferences between Anna and Lepisosteus have long been known (Hay, 1898), but these two kinds of fishes are still placed together, and the inference is that they are closely related. Our examination suggests that although they do agree in having lepidosteid tubes in their cranial bones, they dis- agree in many features. The presence of lepidosteid tubes is suggestive only of a functional parallelism in bone devel- opment; it is not indicative of close common ancestry. Like the brachiopterygian, Lepisosteus appears to be a relatively TABLE 15-4 BASIC PHVlOGENy Of THE VERTEBRATES AS SUGGESTED IN THIS TEXT Dipnoi Tetrapoda • Osteolepiformes * Porolepiformes Actinistia Brachiopterygii Lepisosteus Amia Teleostei Holocephal: Arthrodira Hagfish Lamprey -Choanates GNATHOSTOMATA. 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 Jollie, Malcolm. New York, Reinhold
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