Giant water bugs (Belostomatidae) have important functions in aquatic ecosystems with wide tropical and subtropical distribution. This study describes the spermatozoa morphology of the predator B. anurum. The spermatozoa have not polymorphism and they are scattered without bundles into the seminal vesicle. The mean length of the spermatozoa is 510 μm, including the 35 μm length of the nucleus, which is the longest germ cell, reported for Belostomatidae. The head of the spermatozoa is formed by the acrosome and the nucleus with strongly condensed chromatin. In the nucleus–flagellar transition occurs a C-shaped centriole adjunct, partially surrounding the posterior end of the nucleus and totally surrounding the anterior ends of the two mitochondrial derivatives. In the flagellum, the axoneme has a 9 + 9 + 2 microtubular pattern, and it is linked to the two mitochondrial derivatives by protein bridges. The mitochondrial derivatives are symmetrical surrounding almost entirely the axoneme. The morphology of B. anurum spermatozoa differs from those found in other Pentatomomorpha by the acrosome that does not protrude along with the nucleus and by the single centriole adjunct.

巨型臭虫（Belostomatidae）在热带和亚热带广泛分布的水生生态系统中具有重要功能。这项研究描述了捕食者B.anurum的精子形态。精子没有多态性，它们散乱无束地散布在精囊中。精子的平均长度为510μm，其中包括35μm的核，这是最长的生殖细胞。精子的头部是由顶体和核以及强烈浓缩的染色质形成的。在细胞核-鞭毛过渡中，出现了一个C形的中心粒附属物，部分围绕着细胞核的后端，而完全围绕着两个线粒体衍生物的前端。在鞭毛中，轴突具有9 + 9 + 2的微管模式，并通过蛋白质桥与两个线粒体衍生物相连。线粒体衍生物是对称的，几乎完全围绕着轴突。黄金芽孢杆菌的形态 精子不同于其他五倍体，在顶体中不与核一起突出，而在单个中心粒中也没有。