| Autor: |
Ludvigsen, R., Chatterton, B. D. E. |
| Zdroj: |
Geological Magazine; September 1980, Vol. 117 Issue: 5 p471-478, 8p |
| Abstrakt: |
SummaryThe metaprotaspid of the bumastine Failleana calvais similar to protaspids of scutelluids, whilst late meraspids and early holaspids of F. calvaare similar to fully mature styginids. This suggests that the bumastines were derived from the styginids in the Early Ordovician and that the bumastines later gave rise to the scutelluids. Bumastusand similar Silurian trilobites are phyletic derivatives of Ordovician bumastines and not effaced scutelluids as claimed recently by Lane & Thomas. Revised diagnoses of Illaeninae and Bumastinae are presented. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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