| Pterobranchites Kozlowski, 1967 - an aberrant graptolite? |
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| Abstract: The periderm of Ordovician Pterobranchites antiquus Kozlowski, 1967 has been examined with SEM. Four components have been recognized within the thecal wall: outer lining, cortex, fusellum and inner lining. The cortical material is composed of thick, straight, unbranched fibrils arranged in several layers as in cortical layer of the graptolite periderm. P. antiquus, previously referred to cephalodiscid pterobranchs, is identified as an aberrant graptolite of uncertain taxonomic position. |
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| O |
| C |
| F |
| I |
| Pterobranchites antiquus Kozlowski, 1967. Llandeilo, deep boring Krzyze 4. SEM micrograph of four components of the periderm: O - outer layer, C - cortical layer, F - fusellar layer, I - inner lining. |
| Acta Palaeontologia Polonica 29, 1/2, 83-89 |
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| Portal of Graptolites and Pterobranchs sponsored by M.M. plus M. SZTANDARY |