Abstract
Phylogenetic and ontogenetic variation in the brachio-jugal system, inter-population and intra-population variation, and the structural relationship between the brachidium and crura are probed on the basis of more than 1000 specimens of silicified retziidine Brachiopoda. Also probed is the reliability of reconstructions of interiors, including the brachio-jugal system, based solely on serially sectioned specimens. Caution is advised against proposing new taxa of Brachiopoda based on minor internal differences — possibly without functional significance — or on small variations due to quirks of fossilization, or differences observed in only one or two specimens.
Kurzfassung
Die phylogenetische und ontogenetische Variabilität des Brachiojugal-Systems, sowie inter- und intrapopuläre Veränderlichkeit und strukturelle Beziehungen zwischen Brachidium und Crura, wurden an über 1000 Stücken silifizierter reziidiner Brachiopoden überprüft. Außerdem wurde auf der Basis von Serienschnitten die Verläßlichkeit von Rekonstruktionen innerer Merkmale, einschließlich des Brachiojugal-Systems, getestet. Bei der Einführung neuer Brachiopoden-Taxa, die lediglich auf geringen Unterschieden interner Strukturen basieren, und die möglicherweise ohne funktionale Bedeutung sind, oder die auf geringfügige Veränderungen durch Vorgänge während der Fossilisation zurückzuführen sind, oder auch kleinere Unterschiede, die lediglich an einem oder zwei Stücken beobachtet wurden, wird daher größte Vorsicht angeraten.
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Alvarez, F. Shape, growth, and evolution of the brachio-jugal system developed by the retziidines (Brachiopoda, Athyridida). Senckenbergiana lethaea 79, 131–143 (1999). https://doi.org/10.1007/BF03043219
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DOI: https://doi.org/10.1007/BF03043219