Le Quesne, 1956 (key, subgenera); Péricart, 1994a (notes, syn., syst.), 1999b (monogr.); V.G. Putshkov, 1969a (monogr.); Scudder, 1957d (syst. position); J.A. Slater, 1964a (World cat.); Stichel, 1958c (monogr.); Zheng & Zou, 1981a (monogr.).
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