| Alkenopterus Temporal range: Late Pragian-Early Emsian,
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| SMF VIII 150, the holotype of Alkenopterus brevitelson | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Order: | †Eurypterida |
| Superfamily: | †Onychopterelloidea |
| Family: | †Onychopterellidae |
| Genus: | †Alkenopterus Størmer, 1974 |
| Type species | |
| †Alkenopterus brevitelson Størmer, 1974
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| Species | |
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Alkenopterus is a genus of prehistoric eurypterid classified as part of the family Onychopterellidae. The genus contains two species, A. brevitelson and A. burglahrensis, both from the Devonian of Germany.