. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 51. Comparison of caudal skeletons of four stromateoid families. A. Centrolopfiidae, Hyperoglyphe, from Figure 10. B. Nomeidae, Nomeus, from Figure 24. C. Stromoteidae, Peprilus, from Figure 42. D. Ariommidae, Ariomma, from Figure 33. See text. for attachment of the muscles. This prob- ably has permitted, or even encouraged, the evolution of the deep, firm body char- acteristic of the stromateid grade. With the increase in vertebral number, the number of median finravs increases as well. This, of course, might
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 51. Comparison of caudal skeletons of four stromateoid families. A. Centrolopfiidae, Hyperoglyphe, from Figure 10. B. Nomeidae, Nomeus, from Figure 24. C. Stromoteidae, Peprilus, from Figure 42. D. Ariommidae, Ariomma, from Figure 33. See text. for attachment of the muscles. This prob- ably has permitted, or even encouraged, the evolution of the deep, firm body char- acteristic of the stromateid grade. With the increase in vertebral number, the number of median finravs increases as well. This, of course, might be expected, but need not necessarilv follo\\. The ariom- mids and the tetragonurids, both with in- creased numbers of vertebrae, have very decreased numbers of median finrays. In Psenes and in the stromateids, the increased number of anal finrays has resulted in a forward swing of the first interhaemal so that it forms an abrupt angle with the haemal spine of the first precaudal verte- bra. This tends to support and protect the belly of the fish. In the stromateids, the enlargement and extension of the pelvic bones, which bear no fins, and of the post- cleithrum almost complete this trend to- wards support and, possibly, protection. There has been a general tendency to- ^^'ards increase in the number of \ertebrae in the evolution of the stromateoids. The number of caudal vertebrae has tended to increase the most, but the number of pre- caudal vertebrae has been affected as well. Secondary increase in the number of ver- tebrae from a basic number near 10 + 15 is of common occurrence in teleosts (Gregory, 1951; Liem, 1963). In many 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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