. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 238 Bulletin Museum of Comparative Zoolofiy, Vol. 149, No. 4. Figure 18. Distal portion of the third toe in A. auratus. Note the variation in keel number and placement in scales 1-7. The lateral scales in auratus are multi- DISCUSSION Summary of the Comparative Data The comparisons among annectens, adult and juvenile onca, chrijsolepis, and auratus suggest that there are significant interspecific differences but relatively little novelty in suhdigital morphology per se. The fine structure of setae, keels, spines, etc.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 238 Bulletin Museum of Comparative Zoolofiy, Vol. 149, No. 4. Figure 18. Distal portion of the third toe in A. auratus. Note the variation in keel number and placement in scales 1-7. The lateral scales in auratus are multi- DISCUSSION Summary of the Comparative Data The comparisons among annectens, adult and juvenile onca, chrijsolepis, and auratus suggest that there are significant interspecific differences but relatively little novelty in suhdigital morphology per se. The fine structure of setae, keels, spines, etc. is relatively similar among the species, and, in three of the species, the regional variation in structure ap- proximates the range of interspecific vari- ation. The dominant evolutionary pattern is change in the distribution of keels, se- tae, and spines relative to the phalanges. If the species are arranged in the phy- logenetic series proposed in the earlier paper (Williams, 1974), the major inter- specific differences appear as trends for a) expanded setae distribution in auratus relative to chrysolepis, and b) the pro- gressive substitution of multicarinate. or unicarinate, studded with mechano- spinate morphology for lamellae and se- receptors, and covered with spines. The tae in the chrysolepis-annectens-onca se- spines occur in several sizes (Fig. 19). ries (Fig. 20).. 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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