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| _____________________________________________________________________________________ Graptolite Net is prepared and periodically updated by Piotr Mierzejewski, the Count of Calmont and Countess Maja Anna Korwin-Kossakowska 2004 |
| Portal of Graptolites and Pterobranchs sponsored by Haft Artystyczny - M.M. PLUS M. - SZTANDARY |
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| Graptolite Net | Graptolites & Graptoliters | Evolution of Graptolites | Cephalodiscoidea | Rhabdopleuroidea |
| 'Rhabdopleura' obuti Durman and Sennikov, 1993 from the late Middle Cambrian of Siberia |
| DIAGNOSIS by Durman and Sennikov (1993, pp. 284-285): "Coenoecium consisting of stolonal and zooidal tubes. Colony habitus largely erect with limited, encrusting, proximal portion. Stolonal tubes are 0.25 - 0.75 mm wide with irregular branchings. Sclerotized stolons common showing bifurcation at branch nodes. Stolon thickness between 60 and 80 micrometers. The erect zooidal tubes are 6.6 mm long on average widening gradually to an aperture of about 1 mm. Branching of zooidal tubes occurs quite commonly. No thecal dimorphism or indication of cortical bandaging. Fusellar structures found throughout the whole colony with traces of very irregular zig-zag sutures in the stolonal tubes. Fuseller heights vary 75-150 micrometers in stolonal tubes and 50-100 micrometers in zooidal tubes. Buds and zooids preserved within tubarium with zooids measuring about 0.2 by 0.7 mm." |
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| Specimens of 'Rhabdopleura' obuti origin from a locality on the River Ukukit (Siberia), Zelenotsvetnaya Formation, late Middle Cambrian. To the left you can see the reconstruction of 'Rhabdopleura' obuti by Durman and Sennikov (1993). It shows the colony with branching zooidal tubes, bifurcating stolons, terminal bud and feeding zooids. FOR RELATED PAGES SEE HERE |