Lonchoptera lutea males produce giant spermatozoa that are more than 2000 μm long and 1.4 μm wide. Unlike the typical brachyceran spermatozoon, they have a highly asymmetrical cross-section with only a single, albeit very large, mitochondrial derivative and a pair of massive accessory bodies, one of which extends throughout the entire length of the sperm tail. The accessory bodies consist of an electron-dense matrix in which numerous peculiar electron-lucid substructures are embedded. In the mated female, the giant spermatozoa are found inside two tubular spermathecae which are also extremely long, measuring 4000 μm or more.

中文翻译：

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Lonchoptera lutea Panzer, 1809（双翅目：Lonchopteridae）精子的形态和超微结构

Lonchoptera lutea雄性产生超过 2000 μm 长和 1.4 μm 宽的巨大精子。与典型的短角类精子不同，它们具有高度不对称的横截面，只有一个但非常大的线粒体衍生物和一对巨大的附属体，其中一个贯穿精子尾部的整个长度。附属体由一个电子致密矩阵组成，其中嵌入了许多特殊的电子透明子结构。在交配的雌性中，在两个管状受精囊内发现了巨大的精子，这些受精囊也非常长，尺寸为 4000 微米或更长。