| Metridia longa | |
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| Species: | M. longa
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| Binomial name | |
| Metridia longa (Lubbock, 1854)
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Metridia longa is a copepod found in the Arctic, the north Atlantic, the Pacific, and surrounding waters. The female has an average length of about 4.2 millimetres (0.17 in), and the males have an average length of about 3.5 millimetres (0.14 in).