Runcina brenkoae

Runcina brenkoae (Thompson, 1980)

Runcina brenkoae by Enric Madrenas
Class: Gastropoda  Cuvier, 1797
Subclass: Heterobranchia  J.E. Gray, 1840
Clade: Euthyneura  Spengel, 1881
Clade: Euopisthobranchia  Jörger et al., 2010
Clade:  Runcinacea  Burn, 1963
Superfamily: Runcinoidea  H. Adams & A. Adams, 1854
Family: Runcinidae  J.E. Gray, 1857
Genus: Runcina  Forbes & Hanley, 1851
Species: Runcina brenkoae (Thompson, 1980)

The body shape is elongate, slightly narrower at the front than at the rear, but can vary depending on whether the animal is still or wandering. The specimens can reach up to 3.5 mm in length. The body is coloured dark-brown with a reddish hue and the entire dorsum is covered with irregular lines and black spots that anastomose. There is a series of small whitish dots grouped in the front of the animal, at the sides and at the rear end of the back, also in the base of the tail. On both sides of the head region has a depigmentated zone in which the eyes are easily observable. Under the rear right edge of the dorsum there are two or three small gill leaves, semitransparent but with some fine black spots. The foot has the same coloration as the dorsum although it lacks the black lines and the spots do not anastomose. The tail has a very well defined dark area in the center, and the sides of that area have a whitish translucent shade with some dark spots on the edge.

No data on the biology of this species are known. The few cites available show that it appears in collected masses of various algae. A specimen collected in Cadaqués (Spain) moved with characteristic soft stretching movements followed by a sharp contraction of the body. In addition, while moving, the rear portion of the dorsum (mantle crest) remains somewhat elevated.


  •  Runcina. From Latin “runcina”, carpenter’s plane, a tool used to smooth the wood’s surface.
  • Brenkoae. In honor of Mirjana Hrs-Brenko (1935-) who has been employed at the Rovinj Marine Research Station (Croatia) since 1960, working on bivalves taxonomy, ecology and culture.

This species, originally described by Thompson in 1980 in the Adriatic, in waters of today’s Croatia, has been only collected in Banyuls sur Mer (France) and Catalonia (Cadaqués and Tossa de Mar).

Known georeferenced records of the species: Runcina brenkoae (z-200).
: GROC 2010-2011 : VIMAR
: Enric Madrenas : Manuel Ballesteros.
: João Pedro Silva : M@re Nostrum
: Bernard Picton : Other sources
: GBIF.ORG : Marine Regions

References for the species: Runcina brenkoae


        Western Mediterranean:0 Stars
        Eastern Mediterranean:0.0 Stars
        Atlantic Ocean:0.0 Stars
This chart displays the observation probability for Runcina brenkoae
based on our own records.

More pictures


Bibliography based on the works by Steve Long, 2006. Bibliography of Opisthobranchia 1554-2000 and Gary McDonald, 2009. Bibliographia Nudibranchia, with later updates from other resources.

Further reading

Cite this article as:

Ballesteros, Manuel, Enric Madrenas, Miquel Pontes et al. (2012-2017) "Runcina brenkoae" in OPK-Opistobranquis, Published: 14/08/2013, Accessed: 23/10/2017 at (

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