The Dajidae are a family of marine isopod crustaceans in the suborder Cymothoida. The original description was made by Giard and Bonnier in 1887. Members of this family are ectoparasites of krill. They resemble a fleshy growth on the krill's back, and make the host look as if it is wearing a rucksack. These genera are included in the family Dajidae:
- Allophryxus <small>Koehler, 1911</small>
- Antephyra <small>Schultz, 1978</small>
- Arthrophryxus <small>Richardson, 1908</small>
- Aspidophryxus <small>G. O. Sars, 1883</small>
- Branchiophryxus <small>Caullery, 1897</small>
- Colophryxus <small>Richardson, 1908</small>
- Dajus <small>Krøyer, 1846</small>
- Dolichophryxus <small>Schultz, 1977</small>
- Heterophryxus <small>G. O. Sars, 1885</small>
- Holophryxus <small>Richardson, 1905</small>
- Notophryxus <small>G. O. Sars, 1883</small>
- Oculophryxus <small>Shields & Gómez-Gutiérrez, 1996</small>
- Paradajus <small>Nierstrasz & Brender ÃÂ Brandis, 1923</small>
- Paraspidophryxus <small>Schultz, 1977</small>
- Prodajus <small>Bonnier, 1903</small>
- Prophryxus <small>Richardson, 1909</small>
- Streptodajus <small>Nierstrasz & Brender ÃÂ Brandis, 1923</small>
- Zonophryxus <small>Richardson, 1903</small>
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