. The Bashford Dean memorial volume : archaic fishes. Fishes; Sharks; Fishes, Fossil. The Structure of Dinichthys 203 This compendium alone shows that the question of the relationship of the Arthrodires is a difficult one. The facts we know are so few that the subjective opinions of the in- vestigators play too great a part in their conclusions. In the following sections I shall try to analyze all the different relationships of the Text-figure 90. A total reconstruction of Dinichthys showing the fish in action. THE RELATIONS BETWEEN THE ARTHRODIRA AND OTHER FISH GROUPS When we kno
. The Bashford Dean memorial volume : archaic fishes. Fishes; Sharks; Fishes, Fossil. The Structure of Dinichthys 203 This compendium alone shows that the question of the relationship of the Arthrodires is a difficult one. The facts we know are so few that the subjective opinions of the in- vestigators play too great a part in their conclusions. In the following sections I shall try to analyze all the different relationships of the Text-figure 90. A total reconstruction of Dinichthys showing the fish in action. THE RELATIONS BETWEEN THE ARTHRODIRA AND OTHER FISH GROUPS When we know that the Arthrodira had no Dipnoi-like teeth, that the mechanism of their jaws was unusual and that they were not autostylic, their relation to the Dipnoi, based chiefly on these characters, must be regarded as improbable. Furthermore, they have so little in common with the Holocephali that it is difficult to find any relation- ship there. The opinion of Jaekel that the Arthrodira are closely related to the Chondrostei, is based on the great likeness of the shoulder girdle of Rhynchodonts from Wildungen to that of the Acipenseridae, and to the body carapace of the Arthrodira. The likeness between Rhynchodontus and Aapenser is indeed quite great. Apart from the analogies in shoulder girdle structure as discussed by Jaekel, they also show close relationships in the structures of the neurocranium, head roof, gills and fins. On the other hand, 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 Dean, Bashford, 1867-1928; Gudger, E. W. (Eugene Willis), 1866-1956. New York : Published by order of the trustees
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Keywords: ., book, bookcentury1900, booksubjectfishes, booksubjectfishesfossil
