Berthella agassizi
(MacFarland, 1909)

Family: Pleurobranchidae


West Atlantic - Caribbean to Brazil. Pacific coast of Mexico.


Lark Cay, Belize, Caribbean, in shallow water. Photo: Jeff Hamann.

Body translucent reddish brown to pink with scattered opaque white spots. It is sympatric with Berthella stellata in both the Caribbean and the East Pacific. Grows to approx 25mm long.

  • Gosliner, T.M. & Bertsch, H. (1988) A Review of the genus Berthella (Opisthobranchia: Notaspidea) from the Pacific Coast of North America. The Veliger, 31(1-2): 46-67.
  • MacFarland, F.M. (1909) The opisthobranch Mollusca of the Branner-Agassiz Expedition to Brazil. Leland Stanford Jr University Publication, 2, 1-104.
  • Marcus, Er. (1955) Opisthobranchia from Brazil. Boletim da Faculdade de Filosofia, Ciencias e Letras. Universidade de Sao Paulo, Zoologia 20: 89-261. (Pls. 1-30)
  • Marcus, Er. (1957) On Opisthobranchia from Brazil (2). Journal of the Linnean Society of London, Zoology, 43(292): 390-486
  • Marcus, Ev. & Marcus, Er. (1957): Sea-hares and side-gilled slugs from Brazil. Boletim do Instituto Oceanografico, 6(1-2): 3-48.[for 1955]
  • Marcus, Ev. (1984) The western Atlantic warm water Notaspidea (Gastropoda, Opisthobranchia), Parte 2. Boletim de Zoologia, Universidade de Sao Paulo 8: 43-76.
Authorship details
Rudman, W.B., 2002 (October 10) Berthella agassizi (MacFarland, 1909). [In] Sea Slug Forum. Australian Museum, Sydney. Available from

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