Synodontis longispinis is a species of upside-down catfish that is endemic to the Republic of the Congo where it is found in the Sangha River. It was first described by Jacques Pellegrin in 1930 as Synodontis batesi longspinis, a subspecies of S. batesi with an especially long dorsal fin spine, but it is presently recognized as its own species. The species name longispinis is derived from the word longus, meaning long, and the word spinis, meaning spine, which is a reference to the long dorsal fin spine on the fish.

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