The graptolite Glossograptus Emmons and its proximal structure |
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| Authors: | NI YUNAN ROGER A COOPER |
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| Institution: | 1. Nanjing Institute of Geology and Palaeontology, Academia Sinica , Nanjing, China;2. Institute for Geological and Nuclear Sciences , P. O. Box 30368, Lower Hutt, New Zealand |
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| Abstract: | Ni Yunan & Cooper, R. A., 1994:03:28. The graptolite Glossograptus Emmons and its proximal structure. Alcheringa 18, 161–167. ISSN 0311-5518. New specimens of Glossograptus acanthus from the Ningkuo Shale of China, preserved in relief, help to resolve the much debated problem of the structure of Glossograptus. A model for the proximal structure of the genus is proposed, based on the new material and on Finney's (1978) Athens Shale specimens. The model confirms that Glossograptus has homologous structure and development with Pseudisograptus, and isograptid development type is primitive for the group containing both genera. A cladogram is presented in which the suborder Glossograptina Jaanusson (with families Glossograptidae and Cryptograptidae) together with family Corynoididae Bulman are subsumed within a redefined family Glossograptidae. |
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| Keywords: | Glossograptus Jiangxi Ningkuo Shale pericalycal pseudopericalycal proximal structure |
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