Abstract
It has been suggested that septal furrows in the Palaeozoic rugose corals are secondary in comparison both to growth lines and to the septal blades inside calices. The leading role of furrows as an indicator of septal increase is thus questioned. Septa are always grouped in quadrants but their increase is generally towards the cardinal septum. The arrangement of the contratingent minor septa seems to be independent of the increase in septal furrows. Hence, the growth of the polyp's skeleton may have started from an aseptal cup.
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Fedorowski, J. Principles of early ontogeny in the rugose corals: a critical review. Hydrobiologia 216, 413–418 (1991). https://doi.org/10.1007/BF00026494
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DOI: https://doi.org/10.1007/BF00026494