Many taxonomic issues still need to be solved for the family Chydoridae, but mainly in the subfamily Aloninae. The species Karualona muelleri is an example of a recent taxonomic redefinition, since it was decoupled from the genus Alona and translocated to another genus. In order to expand our knowledge on the species, we investigated population growth and compared the morphometry of the first and second instars, male, parthenogenetic female, ephippial female, and ephippium. An experimental population was obtained by hatching resting eggs collected from the sediment in a temporary lake located in the Serra da Canastra National Park (Minas Gerais, Brazil). The hatched individuals were subjected to morphometric analyses and used in experiments to assess population growth and fecundity. Reproductive age and lifespan were also monitored in two groups of females in different life stages: parthenogenetic and gamogenetic. The reproductive age occurred between the 1ˢᵗ and 15ᵗʰ days of life, and the greatest longevity was 17 days. The start of gamogenetic reproduction was stimulated by elevated population densities and it characterized the slowdown of exponential population growth. Morphometric analyses detected differences between the development phases, as well as similarities in the morphological features of the male, first and second instars, and the two types of females.

中文翻译：

---

Karualona muelleri (Richard, 1897) (Chydoridae, Aloninae) 的生活史

Chydoridae 科仍有许多分类学问题需要解决，但主要是 Aloninae 亚科。Karualona muelleri 物种是最近分类重新定义的一个例子，因为它与 Alona 属分离并转移到另一个属。为了扩大我们对该物种的了解，我们调查了种群增长并比较了第一和第二龄、雄性、孤雌生殖的雌性、雌性和 ephippium 的形态学。通过孵化从位于 Serra da Canastra 国家公园（巴西米纳斯吉拉斯州）的临时湖泊中的沉积物中收集的休眠卵获得了一个实验种群。对孵化的个体进行形态测量分析并用于实验以评估种群增长和繁殖力。还监测了处于不同生命阶段的两组女性的生殖年龄和寿命：孤雌生殖和雌性生殖。生育年龄发生在1ˢᵗ和15ᵗʰ天之间，最长的寿命为17天。遗传繁殖的开始受到人口密度升高的刺激，其特征是人口指数增长放缓。形态测量分析检测到发育阶段之间的差异，以及雄性、一龄和二龄以及两种雌性的形态特征的相似性。遗传繁殖的开始受到人口密度升高的刺激，其特征是人口指数增长放缓。形态测量分析检测了发育阶段之间的差异，以及雄性、一龄和二龄以及两种雌性的形态特征的相似性。遗传繁殖的开始受到人口密度升高的刺激，其特征是人口指数增长放缓。形态测量分析检测到发育阶段之间的差异，以及雄性、一龄和二龄以及两种雌性的形态特征的相似性。