Knowledge of the basic life history traits of an aquatic organism such as voltinism and growth patterns is a fundamental step in understanding its potential use as indicator taxon and how it adapts to its complex environment. The distribution and life cycle of the Maghrebian endemic Choroterpes atlas Soldán & Thomas, 1983 was studied over a two year period. Random forest classification indicated that the species occupied both permanent and intermittent streams with high water depth, large river bed width and strong water flow. Density-based clustering of body measurements allowed the identification of last-instar nymphs which exhibited a significant sexual dimorphism: F-0 females were significantly larger than corresponding males. In addition, size-frequency plots and generalized additive models indicated that C. atlas exhibited a multivoltine annual cycle with three overlapping generations. Nymphal growth of the first generation happened in winter and spring with emergence occurring in June/July. The second generation grew from June/July to September whereas the third generation was completed from August/September to November. GAMs also indicated that body size varied significantly between years. The large regional distribution, habitat requirement, and phenology of C. atlas may ideally complement the potential use of Ecdyonurus rothschildi as a useful environmental indicator for North African streams and rivers.

了解水生生物的基本生活史特征（例如伏丁病和生长模式）是了解其作为指示类群的潜在用途及其如何适应其复杂环境的基本步骤。马格里布地方性乔罗特斯图谱的分布和生命周期Soldán & Thomas, 1983 研究了两年。随机森林分类表明，该物种栖息在水深大、河床宽、水流强的永久性和间歇性溪流中。基于密度的身体测量聚类允许识别表现出显着性别二态性的末龄若虫：F-0 雌性显着大于相应的雄性。此外，大小频率图和广义加性模型表明C. atlas展示了一个具有三个重叠世代的多伏特年度周期。第一代若虫在冬春两季生长，6、7月出苗。第二代从六月/七月生长到九月，而第三代从八月/九月到十一月完成。GAM 还表明，不同年份的体型差异很大。C. atlas的大区域分布、栖息地要求和物候可以理想地补充Ecdyonurus rothschildi作为北非溪流和河流的有用环境指标的潜在用途。