Department of Ecology and Conservation Biology and Biodiversity Research and Teaching Collections, Texas A&M University, College Station, Texas, USA.
Department of Biology, Southeast Missouri State University, Cape Girardeau, Missouri, USA.
J Fish Biol. 2021 Aug;99(2):418-424. doi: 10.1111/jfb.14733. Epub 2021 Apr 13.
Larval attachment organs (LAOs) are unicellular or multicellular organs that allow larvae to adhere to a substrate before yolk-sac absorption and the free-swimming stage. This study documents the LAO of tropical gar, Atractosteus tropicus, using a combination of scanning electron microscopy and light microscopy. It is shown that the LAO of A. tropicus is a super-organ surrounded by a wall and containing at its centre many smaller multicellular organ units, each comprised of attachment and support cells. Attachment cells are secretory and house large vacuoles filled with a glycoprotein. At hatching, the super-organ is well developed and occupies almost the entire anteroventral surface of the head. During subsequent development, the smaller individual units begin to regress, until at 6 days post-hatching the super-organ and its individual units are no longer visible.
幼虫附着器官（LAO）是单细胞或多细胞器官，允许幼虫在卵黄囊吸收和自由游泳阶段之前附着在基质上。本研究使用扫描电子显微镜和光学显微镜结合的方法记录了热带巨骨舌鱼（Atractosteus tropicus）的 LAO。结果表明，A. tropicus 的 LAO 是一个被壁包围的超级器官，其中央包含许多较小的多细胞器官单位，每个单位由附着和支持细胞组成。附着细胞是分泌细胞，其中含有充满糖蛋白的大液泡。孵化时，超级器官发育良好，几乎占据头部的整个前腹表面。在随后的发育过程中，较小的单个单位开始退化，直到孵化后 6 天，超级器官及其单个单位不再可见。
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