Abstract Previously undescribed trilobites from the Late Ordovician (latest Eastonian, mid Katian) Gunningbland Formation of central New South Wales include the calymenid Prophalaron jonesi gen. et sp. nov. and the odontopleurid Dicranurus webbyi sp. nov. Prophalaron resembles some members of the Reedocalymeninae, in particular Neseuretinus, in the presence of a relatively long, convex preglabellar field and a short, upturned anterior border. However, this similarity is a result of convergence, and other characters such as the weaker vaulting of the cephalon and pygidium as well as the hypostomal morphology indicate that Prophalaron belongs to the Calymeninae. Dicranurus webbyi is the first odontopleurid recorded from the Ordovician of Australia. The species lacks the reduction in length of the fifth thoracic segment and its posterior pleural spine that have been suggested as diagnostic of the genus. David J. Holloway [dhollow@museum.vic.gov.au], Museums Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia; Patrick M. Smith* [Patrick.Smith@austmus.gov.au], Australian Museum, 1 William Street, Sydney, New South Wales 2010, Australia; Geoff Thomas [fossilgt@gmail.com], PO Box 130, Southland Centre, Victoria 3192, Australia. *Also affiliated with: Department of Biological Sciences, Macquarie University, Sydney, New South Wales 2109, Australia.

中文翻译：

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三叶虫 Prophalaron gen。十一月 (Calymenidae) 和 Dicranurus (Odontopleuridae) 来自新南威尔士州上奥陶统

摘要 来自新南威尔士中部晚奥陶世（最新的伊斯顿纪，中卡蒂安）Gunningbland 组的先前未描述的三叶虫包括 calymenid Prophalaron jonesi gen。等 sp. 十一月 和 odontopleurid Dicranurus webbyi sp。十一月 Prophalaron 类似于 Reedocalymeninae 的一些成员，特别是 Neseuretinus，存在相对长、凸的前睑前区和短、上翘的前缘。然而，这种相似性是趋同的结果，而其他特征，如头颅和尾椎较弱的拱形以及气孔下的形态表明 Prophalaron 属于 Calymeninae。Dicranurus webbyi 是澳大利亚奥陶纪记录的第一个 odontopleurid。该物种缺乏第五胸节及其后胸膜棘长度的减少，这已被认为是该属的诊断依据。David J. Holloway [dhollow@museum.vic.gov.au]，维多利亚博物馆，GPO Box 666，墨尔本，维多利亚 3001，澳大利亚；Patrick M. Smith* [Patrick.Smith@austmus.gov.au]，澳大利亚博物馆，1 威廉街，悉尼，新南威尔士 2010 年，澳大利亚；Geoff Thomas [fossilgt@gmail.com], PO Box 130, Southland Centre, Victoria 3192, Australia。*还隶属于：澳大利亚新南威尔士州悉尼麦考瑞大学生物科学系 2109。1 威廉街，悉尼，新南威尔士州 2010，澳大利亚；Geoff Thomas [fossilgt@gmail.com], PO Box 130, Southland Centre, Victoria 3192, Australia。*还隶属于：澳大利亚新南威尔士州悉尼麦考瑞大学生物科学系 2109。1 威廉街，悉尼，新南威尔士州 2010，澳大利亚；Geoff Thomas [fossilgt@gmail.com], PO Box 130, Southland Centre, Victoria 3192, Australia。*还隶属于：澳大利亚新南威尔士州悉尼麦考瑞大学生物科学系 2109。