The infraorder Bathydoridoidei is a group of nudibranchs that, together with the members of the Doridoidei infraorder, formed the traditional taxon Doridacea, from which they have separated because of the presence of strong lateral chitinous jaws in the buccal bulb.
Bathydoris aioca
(Font: 2012 Gulf of California Expedition)

The taxonomy of Bathydoridoidei proposed by Bouchet et al. (2017) and accepted at WoRMS is as follows:
- Infraorder Bathydoridoidei
- Superfamily Bathydoridoidea Bergh, 1891
- Family Bathydorididae Bergh, 1891
- Genus Bathydoris Bergh, 1884
- Genus Doriodoxa Bergh, 1899
- Genus Prodoris Baranetz & Minichev, 1995
- Family Bathydorididae Bergh, 1891
- Superfamily Bathydoridoidea Bergh, 1891
None of these genus have any recorded species in Mediterranean or Iberian waters.
Bibliography
Troncoso, J. S., F. J. García García, J. C. García Gómez, and M. Ballesteros. 1999. Moluscos opistobranquios capturados durante las expediciones españolas Bentart 94 y 95, ampliando la distribución de rango batimétrico de Bathydoris hodsoni. Nova acta Científica Compostelana (Bioloxía), 9: 321-323.
Wägele, H., C. Avila, and M. Ballesteros. 2006. Defensive glandular structures in opisthobranch molluscs: from histology to ecology. Oceanography and Marine Biology: an annual review, 44: 197-276.