The genus Camelobaetidius is the second most diverse genus of the family Baetidae in America. Also, two other genera were described as closely related to Camelobaetidius: Corinnella, and Tapajobaetis. A peculiar spatulate tarsal claw is the character shared among them. We used TNT (Tree analysis using New Technology) and GEM (Geographically explicit Event Model) to recover the phylogenic and biogeographic history of these genera. A matrix of 42 taxa and 77 morphological characters was constructed, of which 68 were treated as discrete and nonadditive (unordered), and eight as continuous. All available records of Camelobaetidius plus Corinnella, Tapajobaetis, and the species’s outgroup were included in the biogeographic analysis. Corinnella and Tapajobaetis were obtained into Camelobaetidius and, therefore, are here considered junior synonyms. The founder events were the most frequent in this genus, followed by vicariance, sympatry and point sympatry. The long-distance dispersal ability in mayfly seems to be the rule instead of the exception in the history of this clade.

属Camelobaetidius是美国家庭Baetidae的第二个最多样化的属。另外，还描述了与骆驼科动物密切相关的另外两个属：科林内拉和塔帕霍巴蒂斯。他们之间共有一个独特的spa舌状爪。我们使用TNT（使用新技术进行树分析）和GEM（地理显式事件模型）来恢复这些属的系统发生史和生物地理史。构建了一个包含42个分类单元和77个形态特征的矩阵，其中68个被视为离散和非加性（无序），八个被视为连续。Camelobaetidius加上Corinnella，Tapajobaetis的所有可用记录，以及该物种的外群都包括在生物地理分析中。Corinnella和Tapajobaetis获得进入Camelobaetidius，因此，在这里考虑的异名。创建者事件是该属中最常见的事件，其次是疏离，交叠和点交叠。cl蝇的远距离分散能力似乎是该进化史上的规则而不是例外。