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Details van artikel 35 van 206 gevonden artikelen
| Titel: |
A provisional phylogeny for some reconstructed Late Devonian polygnathid conodont apparatuses |
| Auteur: |
Philip, G. M. McDonald, L. |
| Verschenen in: |
Alcheringa |
| Paginering: | Jaargang 1 (1975) nr. 1 pagina's 97-107 |
| Jaar: |
1975 |
| Inhoud: |
New collections of Late Devonian age, from the Canning Basin, Western Australia, permit an examination of the evolutionary origin of stratigraphically important palmatolepan elements in terms of reconstructed apparatuses. The apparatuses conform to the polygnathid plan of Klapper & Philip (1971, 1972) and are described in such terms. The reconstruction of Mesotaxis Klapper & Philip (based on Polygnathus asymmetricus) is emended to an apparatus with a lippertiform N element and a ramiform symmetry transition series. Early forms of Palmatodella (here used to include all apparatuses with a palmatolepan P element) possess a similar lippertiform N element, a palmatodellan O element, and a symmetry transition series clearly derived from that of Mesotaxis. In Palmatodella triangularis the N element is lost and is not represented in younger Fammenian species of Palmatodella. It is considered premature to attempt to relate the new reconstructions to a detailed generic taxonomy. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 35 van 206 gevonden artikelen
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