Gerarus
| Gerarus Temporal range: | |
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| Gerarus fossil, National Museum of Natural History | |
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| Family: | †Geraridae |
| Genus: | †Gerarus Scudder, 1885 |
Gerarus is an extinct genus of Archaeorthopteran insect, and is one of the most abundant genera of Carboniferous insects. They had a wingspan of up to 10 centimetres (4 in), and an inflated thorax armed with sharp spines up to 1 millimetre (0.04 in) long.