Leptonotus is a genus of pipefishes of the family Syngnathidae.Fritzsche, R.A. 1980. A revisionary study of the eastern Pacific Syngnathidae (Pisces: Syngnathiformes), including both recent and fossil forms. Proceedings of the California Academy of Sciences 42(6): 181-227. The name is derived from the Greek leptos meaning "thin" and noton meaning "back".

Species The currently recognized species in this genus are: Leptonotus blainvilleanus (Eydoux & Gervais, 1837) (deep-bodied pipefish) Leptonotus elevatus (F. W. Hutton, 1872) (high-body pipefish) Leptonotus norae (Waite, 1910) (longsnout pipefish) Leptonotus vincentae Luzzatto & Estalles, 2019

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