This study shows the ultrastructure of the mature spermatozoon of Lecithostaphylus parexocoeti (Digenea, Microphalloidea, Zoogonidae) parasite of the flying fish Cheilopogon pinnatibarbatus (Exocoetidae) captured in the Atlantic Ocean near Dakar (Senegal). This is the first report of L. parexocoeti from Senegal and from this host species. The mature spermatozoon is filiform and exhibits two axonemes of the 9+“1” pattern of the Trepaxonemata, an external ornamentation associated with spine-like bodies, parallel cortical microtubules, a nucleus, two mitochondria and granules of glycogen. The particularities of the spermatozoon of L. parexocoeti are the location of the first mitochondrion and the morphology of its anterior extremity with only cortical microtubules and external ornamentations of the plasma membrane. To our knowledge, this type of anterior extremity has never been described in the superfamily Microphalloidea. However, the ultrastructure of the posterior extremity of the spermatozoon corresponds to the fasciolidean type that was previously described in the Zoogonidae.

中文翻译：

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塞内加尔近海飞鱼 Cheilopogon pinnatibarbatus (Teleostei, Exocoetidae) 的 Lecithostaphylus parexocoeti (Digenea, Microphalloidea, Zoogonidae) 精子超微结构及其对 Microphalloidea 系统发育关系的影响

这项研究显示了在达喀尔（塞内加尔）附近的大西洋捕获的飞鱼 Cheilopogon pinnatibarbatus（Exocoetidae）寄生虫的 Lecithostaphylus parexocoeti（Digenea、Microphalloidea、Zoogonidae）成熟精子的超微结构。这是来自塞内加尔和该宿主物种的 L. parexocoeti 的第一份报告。成熟的精子呈丝状，呈现出螺旋线体 9+“1”模式的两个轴丝，一种与棘状体相关的外部装饰、平行的皮质微管、一个细胞核、两个线粒体和糖原颗粒。L. parexocoeti 精子的特殊性是第一个线粒体的位置及其前肢的形态，只有皮质微管和质膜的外部装饰。据我们所知，这种类型的前肢从未在 Microphalloidea 总科中被描述过。然而，精子后肢的超微结构对应于之前在动物科动物中描述的 fasciolidan 类型。