Traits name details
original description
(of Grantonia hobartensis Brown, 1953 †) Brown, I. A. (1953). Permian spirifers from Tasmania. <em>Journal Proceedings of the Royal Society N. S. W.</em> 86: 55-63. [details]
additional source
Clarke, M. J. (1979). The Tasmanian Permian spiriferid brachiopods Trigonotreta stokesi, Koenig, 1825, Grantonia hobartensis, Brown, 1953 and Spirifer tasmaniensis, Morris, 1845. <em>Journal of Paleontology.</em> 53: 197-207. note: Recognizes genus Grantonia is junior synonym of Trigonotreta. [details]
additional source
Waterhouse, J. B. (2004). Permian and Triassic stratigraphy and fossils of the Himalaya in northern Nepal. <em>Earthwise.</em> 6: 1-259. [details] Available for editors 
new combination reference
Armstrong, J. D. (1968). Synonymy of the Australian Permian spiriferid genera <i>Trigonotreta</i> Koenig, 1825 and <i>Grantonia</i> Brown, 1953. <em>Journal of the Geological Society of Australia.</em> 15(1): 79-86, pl. 6. note: Recombines species as Trigonotreta hobartensis. [details]
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