Braula coeca has been reported repeatedly, but incorrectly, to have only a single spermatheca—an extremely rare condition in the higher flies. This error is based on the misinterpretation of the ventral receptacle as a single spermatheca combined with the failure to detect the two present but largely reduced dorsal spermathecae. This misconception is of importance, e. g., for correct character coding in phylogenetic analyses and in the context of studies regarding recurrent trends in the evolution of the spermathecae and the ventral receptacle. The ventral receptacle of B. coeca is described and illustrated in detail together with other aspects of the female reproductive tract.

中文翻译：

---

直接记录II：Braula coeca（双翅目：Braulidae）的“单一受精囊”实际上是腹侧容器

Braula coeca 曾多次被报道但错误地只有一个受精囊——在高等苍蝇中这是一种极为罕见的情况。这个错误是基于将腹侧容器误解为单个受精囊，同时未能检测到两个存在但大大减少的背侧受精囊。这种误解很重要，例如，对于系统发育分析中的正确特征编码，以及在有关受精囊和腹侧容器进化中反复趋势的研究背景下。B. coeca 的腹侧容器与雌性生殖道的其他方面一起被详细描述和说明。