The type species of the brachiopod Yunnanellina from the Devonian of South China
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Yunnanellina hanburyi, the type species of the genus, is widely distributed in South China. Study of the external and internal features of abundant specimens from three sections in central Hunan indicates that other previously described nominal species and subspecies of Yunnanellina from the Upper Devonian of South China, are junior synonyms of the type species. Y. hanburyi is very varied in both external form and internal structures. Internally, the septalium may be open, or covered anteriorly by a connectivum. This connectivum shows a systematic change with time and, on this basis, three morphotypes have been established which comprise the Y. hanburyi lineage. The stratigraphical range of the lineage can be correlated with the upper crepida Zone (Early Famennian).
Palaeontology - Volume 38 Part 2 Pages 385-405Palaeontology - Volume 38 Part 2 Pages 385-405
Citations
XUEPING, M. 1995. The type species of the brachiopod Yunnanellina from the Devonian of South China. Palaeontology, 38, 2, 385–405.