Trilobites and agnostids from the Goyder Formation (Cambrian Series 3, Guzhangian; Mindyallan), Amadeus Basin, central Australia Author Smith, Patrick M. Author Paterson, John R. Author Brock, Glenn A. text Zootaxa 2018 2018-03-19 4396 1 1 67 journal article 30484 10.11646/zootaxa.4396.1.1 918f2145-a708-460e-b19b-4f67e6c99b30 1175-5326 1202723 8EEBE6DE-0ECC-4B9C-AD14-01438291782B Blackwelderia Walcott, 1906 Type species. Calymene ? sinensis Bergeron, 1899 . Discussion. This genus has been discussed exhaustively by numerous authors (e.g., Walcott 1913 ; Kobayashi 1942; Lu et al. 1965; Öpik 1967; Park et al. 2013), yet the concept of the genus is still poorly understood. Park et al. (2013) suggested that this problem stems from a number of species erected on poorly preserved specimens, including the lectotype for Blackwelderia sinensis (Bergeron, 1899) , which come from weathered shale material in North China (see Peng et al. 2004a; Peng 2007). Such incomplete or poorly preserved specimens has led to taxonomic confusion with morphologically similar genera such as Damesella Walcott, 1905 and oversplitting of Blackwelderia (see Wang et al . 1989 ; Zhu & Wittke 1989; Guo et al . 1996 for expansive species lists). Park et al. (2013) suggested that a detailed morphological and taxonomic assessment of Blackwelderia is required to resolve the generic concept.