. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 182 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY appearance in the Ordovician became extinct by the Silurian and Devonian. During the latter half of the Paleozoic the evolutionary rate of the nautiloids was greatly diminished. A second surge occurred in the Upper Triassic which has a diversified nautiloid 275. vvwvww 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 NAUTILOID GENERA i i 1- 111 k::v ??:::^: [ 0RD. SIL DEV. MISS PENN PERM JURA. CRET. Pa E. Cenozoic Fig. 1. Bar graph showing number of nautiloid
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 182 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY appearance in the Ordovician became extinct by the Silurian and Devonian. During the latter half of the Paleozoic the evolutionary rate of the nautiloids was greatly diminished. A second surge occurred in the Upper Triassic which has a diversified nautiloid 275. vvwvww 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 NAUTILOID GENERA i i 1- 111 k::v ??:::^: [ 0RD. SIL DEV. MISS PENN PERM JURA. CRET. Pa E. Cenozoic Fig. 1. Bar graph showing number of nautiloid genera in each geologic period. (Data from C. Teichert, personal communication.). 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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