Eubranchus farrani

Eubranchus farrani (Alder & Hancock, 1844)

Eubranchus farrani (forma A) by Enric Madrenas

Taxonomy
 

Superdomain

Biota  

 

Kingdom

Animalia  

 

Phylum

Mollusca  

 

Class

Gastropoda  

 

Subclass

Heterobranchia  

 

Infraclass

Euthyneura  

 

Subterclass

Ringipleura  

 

Superorder

Nudipleura  

 

Order

Nudibranchia  

 

Suborder

Cladobranchia  

 

Superfamily

Fionoidea  

 

Family

Eubranchidae  

 

Genus

Eubranchus  

 

Species

Eubranchus farrani  (Alder & Hancock, 1844)

 
 Classification according to Bouchet et al. (2017)
Taxonomic source: World Register of Marine Species (AphiaID: 139766).

Taxonomic note: The phylogenetic analyses performed by Cella et al. (2016) revealed that the traditional Tergipedidae family is polyphyletic and belongs to a larger monophyletic clade including members of the traditional families Eubranchidae, Fionidae and Calmidae; this was an unexpected result, since the validity of these taxa and their distinctness from the Tergipedidae was never questioned before. They proposed to join the families Tergipedidae, Eubranchidae, Calmidae and Fionidae under the name of Fionidae. This decision has been reinterpreted and completed in the paper by Korshunova et al. (2017) because it obviated evident morphological and molecular aspects.

Despite the four known forms of Eubranchus farrani are actually accepted, there’s an increasingly accepted opinion among professionals regarding the possibility that they are four distinct species. There are molecular studies on the way.

The Mediterranean specimens identified as Eubranchus tricolor are clearly not conspecific to the Atlantic specimens, but they are quite similar to Eubranchus farrani form “D”, although they could be a new unidentified species.

Synonyms

  • Aeolis adelaidae Thompson, 1860
  • Amphorina alberti Quatrefages, 1844
  • Cavolina farrani (Alder & Hancock, 1844)
  • Eolidia flavescens Risso, 1826
  • Eolis adelaidae Thompson W., 1859
  • Eolis andreapolis MacIntosh, 1865
  • Eolis farrani Alder & Hancock, 1844 (original)
  • Eolis robertianae MacIntosh, 1865
  • Galvina farrani (Alder & Hancock, 1844)
  • Galvina flava Trinchese, 1879

Description
The specimens of this species can achieve more than 20 mm in length but in most cases the specimens are smaller, of 10 to 15 mm. Coloration for this species is highly variable, so several chromatic forms A, B, C and D (Edmunds & Kress, 1969) have been described:

 

Form A is the most common coloration observed in the Mediterranean specimens: whitish body with yellow or orange spots on the dorsum, head, oral palps, rhinophores, cerata and sides. Form B are those individuals which have the entire body and cerata covered with large brown spots. Specimens of the form C are orange or yellow except the tips of cerata which are white. Form D is composed by those individuals with whitish gray cerata with a white ring at the apex. Oral palps are relatively short and the rhinophores are smooth. The cerata are gathered in groups 7-8 to each side of the back, and the ones in the front may have up to 5 cerata; the cerata may be globular in their middle zone, specially in the Form A specimens, or be less globose and curved inwards. The digestive gland can be observed within the cerata as a somewhat thickened cream colored central cord. The heart region is located between the second cerata group and the anal opening is located in a small papilla placed right behind and slightly to the right of the cardiac area. The genital opening is located below and slightly behind the first right group of cerata. The foot is relatively wide and has no propodial palps in its front zone.

Biology
This species is usually found in shallow littoral bottoms where hydrozoans grow on algae as epibionts. E. farrani feeds on small hydrarians like Obelia geniculata growing on kelp, in Codium fragile and other algae or mussel shells. It can also be located under stones where hydrarians grow. In European Atlantic coasts, specimens of different color forms are often found mating together indiscriminately (Edmunds & Kress, 1969). The spawn is a small ribbon coiled in one turn, or one turn and half, with white or slightly pink eggs of about 90 microns (Schmekel & Portmann, 1982).

Etymology

  • Eubranchus, from Greek, meaning “true gills”
  • Farrani = in honor of Dr. G.P. Farran of Dublín, naturalyst and shell collector who helped in the Alder & Hancock sampling campaign in the Irish shores in 1843, where the type specimen used to describe the species was collected.

Distribution
This species has been cited in Norway, the British Isles, Atlantic coasts of France and the English Channel, the Iberian Peninsula, the Canary islands, Açores and the western Mediterranean. In the Iberian Peninsula shores it has been cited in all areas except in the Bay of Biscay. In the Catalan coast it has been observed in different localities as Cala Sant Antoni, Es Caials, Cadaques, L’Escala, Tossa de Mar, Cala Santa Cristina, Blanes and Cubelles.

Known georeferenced records of the species: Eubranchus farrani
Sources:
: OBIS
: GROC 2010-2011
: Enric Madrenas
: João Pedro Silva
: Bernard Picton
: GBIF.ORG
: OPK
: VIMAR
: Manuel Ballesteros.
: M@re Nostrum
: Altres fonts
: Marine Regions

References for the species: Eubranchus farrani

    Galicia: Urgorri and Besteiro (1983, 1984), Rolán (1983). Portugal: García-Gómez et al. (1991), Calado et al. (1999, 2003). Andalucía (Atl.): Cervera and García-Gómez (1986). Gibraltar: García-Gómez et al. (1989). Andalucía (Med.): Templado, Talavera and Murillo (1987), Templado, Luque and Moreno (1988), Sánchez Tocino, Ocaña and García (2000a), Ocaña et al. (2000). Levante: Templado (1982b, 1983, 1984). Catalunya: Ros (1975, 1978b, citada como E. cf. farrani), Ballesteros (1980, 1984b, 1985), Pereira & Ballesteros (1982), Domènech et al. (2002). Canarias: Ortea et al. (2001), Moro et al. (2003), Wirtz and Debelius (2003). Azores: Fontes, Tempera and Wirtz (2001).

    General: Barletta, 1981:105; Brown & Picton, 1979:24; Cattaneo-Vietti, Chemello, & Giannuzzi-Savelli, 1990:175[P]; Edmunds, 1969:[P]; Edmunds & Kress, 1969:889; Hayward, Wigham, & Yonow, 1990:721; Heppell, 1964a:413; Hunnam & Brown, 1975:156; Just & Edmunds, 1985:106, 108[P]; O'Donoghue, 1929:749; Picton & Morrow, 1994:116[P]; Riedl, 1983:330; Schmekel, 1970:159; Schmekel & Portmann, 1982:241[P]; Thompson, 1988:294; Thompson & Brown, 1976:166; 1984:134[P]

    Sources: Cervera et al., 2004, Ballesteros, 2007 & 2016, McDonald, 2006 and other sources.

Abundance

    Western Mediterranean:2 out of 5 stars
    Eastern Mediterranean:1 out of 5 stars
    Atlantic Ocean:2 out of 5 stars
Month

This chart displays the monthly observation probability for Eubranchus farrani based on our own records.

More pictures


Bibliography

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Further reading

Cite this article as:

Ballesteros, Manuel, Enric Madrenas, Miquel Pontes (2012-2019) "Eubranchus farrani" in OPK-Opistobranquis, Published: 16/05/2012, Accessed: 16/11/2019 at (https://opistobranquis.info/en/zq0hl)

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